3048: Suspension Bridge - Revision history

NiceGuy1: /* Explanation */

2025-08-03T06:45:08Z

‎Explanation

NiceGuy1: /* Explanation */

2025-08-03T06:43:35Z

‎Explanation

NiceGuy1: The cables are obviously depicted as being replaced by a road deck, who thought this wasn't explained?

2025-08-03T06:42:27Z

The cables are obviously depicted as being replaced by a road deck, who thought this wasn't explained?

CalibansCreations: /* Explanation */

2025-02-25T09:22:42Z

‎Explanation

172.71.159.45: Remove obsolete tag

2025-02-19T23:26:33Z

Remove obsolete tag

172.70.111.177 at 19:20, 10 February 2025

2025-02-10T19:20:31Z

108.162.245.246 at 06:17, 10 February 2025

2025-02-10T06:17:13Z

172.69.43.180: /* Explanation */

2025-02-09T15:12:43Z

‎Explanation

Kynde: /* Transcript */

2025-02-09T08:21:35Z

‎Transcript

Kynde: /* Transcript */ CE my own mistakes

2025-02-09T08:13:42Z

‎Transcript: CE my own mistakes

@@ Line 13: / Line 13: @@
 A {{w|suspension bridge}} works by exploiting the strength in tension of a cable, or series of links, in what is ''usually'' described as a {{w|catenary}} curve (but see later) suspended between towers or other elevated positions and firmly anchored to the ground at either end. Such a cable, or parallel cables, can span a large gap, across which an {{w|Arch_bridge|arch}} (with compressive forces) or {{w|Cantilever_bridge|cantilever}} (with compression below and tension above) bridge structure would be more difficult. The slung droop of the connection, and various other issues (the susceptibility to resonance from moving loads, as well as the sheer impracticality of travelling along this link) means that the surface of the usual road itself (or footway, in the case of a {{w|Arouca 516|non-vehicular bridge}}) is suspended from this cable by vertical (and perhaps diagonal) suspending stringers of suitable lengths to maintain a more level track. This usually means that the greatest clearance beneath the traversable part of the bridge is not far below the middle of the main curve of the cable, which has the closest (or direct) attachment to the bridging 'deck'. Unlike the free-hanging cable, the addition of the weight of the road and the large number of vertical cables required now forces the cable to take the path of a similar parabolic curve, rather than a true catenary, and may also have to further flex significantly according to wind, temperature and the changing loads of passing traffic with significant mass.
-Randall suggests 'improving' the suspension bridge by having ''just'' the catenary curve, needing much less structure, and giving an increased clearance for anything passing beneath (in this case, a tall-masted sailboat) if they pass closer to the supporting towers. This, of course, means that the traffic can ''only'' cross where the upper cables themselves were, seemingly having been replaced by the road deck judging by the double lines in this side-section view. Due to the steep nature of the way the cable must pass over the supports, this produces a steep gradient up to and then down from the tower which sends traffic temporarily onto a free ballistic trajectory, assuming it has enough speed. This is described as "fun jumps", {{w|Bug (engineering)#"It's not a bug, it's a feature"|as if it is how bridges ''should'' work}}. This would likely inflict damage on the car, and might result in unfortunate accidents. Some bridges are designed for traffic to go on top with a {{w|Stressed ribbon bridge|cable underneath}}, but these are only used for shorter spans and can flex significantly.{{cn}}
+Randall suggests 'improving' the suspension bridge by having ''just'' the catenary curve, needing much less structure, and giving an increased clearance for anything passing beneath (in this case, a tall-masted sailboat) if they pass closer to the supporting towers. This, of course, means that the traffic can ''only'' cross where the upper cables themselves were, seemingly having been replaced by the road deck judging by the double lines in this side-section view. Due to the steep nature of the way the new road deck must pass over the supports, this produces a steep gradient up to and then down from the tower which sends traffic temporarily onto a free ballistic trajectory, assuming it has enough speed. This is described as "fun jumps", {{w|Bug (engineering)#"It's not a bug, it's a feature"|as if it is how bridges ''should'' work}}. This would likely inflict damage on the car, and might result in unfortunate accidents. Some bridges are designed for traffic to go on top with a {{w|Stressed ribbon bridge|cable underneath}}, but these are only used for shorter spans and can flex significantly.{{cn}}
 The title text suggests a gradual introduction of this new form of bridge, a practice which is common when introducing new large-scale societal changes. According to Randall, the bridges would at first be a sort of hybrid between the old and new design, where any driver could choose between taking the catenary curve or driving along the tried-and-true flat road. As more and more people sample the "fun jumps" path, he claims, word will spread about how much 'better' this path is, and once it's been widely adopted, the flat road will be discontinued. In reality, a more likely result would be that drivers who take the catenary curve quickly spread word about how ''dangerous'' this path is (and/or spread themselves, and their wrecked vehicles, all around the terrain that the bridge is supposed to cross), and any usage would quickly disappear.

@@ Line 13: / Line 13: @@
 A {{w|suspension bridge}} works by exploiting the strength in tension of a cable, or series of links, in what is ''usually'' described as a {{w|catenary}} curve (but see later) suspended between towers or other elevated positions and firmly anchored to the ground at either end. Such a cable, or parallel cables, can span a large gap, across which an {{w|Arch_bridge|arch}} (with compressive forces) or {{w|Cantilever_bridge|cantilever}} (with compression below and tension above) bridge structure would be more difficult. The slung droop of the connection, and various other issues (the susceptibility to resonance from moving loads, as well as the sheer impracticality of travelling along this link) means that the surface of the usual road itself (or footway, in the case of a {{w|Arouca 516|non-vehicular bridge}}) is suspended from this cable by vertical (and perhaps diagonal) suspending stringers of suitable lengths to maintain a more level track. This usually means that the greatest clearance beneath the traversable part of the bridge is not far below the middle of the main curve of the cable, which has the closest (or direct) attachment to the bridging 'deck'. Unlike the free-hanging cable, the addition of the weight of the road and the large number of vertical cables required now forces the cable to take the path of a similar parabolic curve, rather than a true catenary, and may also have to further flex significantly according to wind, temperature and the changing loads of passing traffic with significant mass.
-Randall suggests 'improving' the suspension bridge by having ''just'' the catenary curve, needing much less structure, and giving an increased clearance for anything passing beneath (in this case, a tall-masted sailboat) if they pass closer to the supporting towers. This, of course, means that the traffic can ''only'' cross where the upper cables themselves were, seemingly having been replaced judging by the double lines in this side-section view. Due to the steep nature of the way the cable must pass over the supports, this produces a steep gradient up to and then down from the tower which sends traffic temporarily onto a free ballistic trajectory, assuming it has enough speed. This is described as "fun jumps", {{w|Bug (engineering)#"It's not a bug, it's a feature"|as if it is how bridges ''should'' work}}. This would likely inflict damage on the car, and might result in unfortunate accidents. Some bridges are designed for traffic to go on top with a {{w|Stressed ribbon bridge|cable underneath}}, but these are only used for shorter spans and can flex significantly.{{cn}}
+Randall suggests 'improving' the suspension bridge by having ''just'' the catenary curve, needing much less structure, and giving an increased clearance for anything passing beneath (in this case, a tall-masted sailboat) if they pass closer to the supporting towers. This, of course, means that the traffic can ''only'' cross where the upper cables themselves were, seemingly having been replaced by the road deck judging by the double lines in this side-section view. Due to the steep nature of the way the cable must pass over the supports, this produces a steep gradient up to and then down from the tower which sends traffic temporarily onto a free ballistic trajectory, assuming it has enough speed. This is described as "fun jumps", {{w|Bug (engineering)#"It's not a bug, it's a feature"|as if it is how bridges ''should'' work}}. This would likely inflict damage on the car, and might result in unfortunate accidents. Some bridges are designed for traffic to go on top with a {{w|Stressed ribbon bridge|cable underneath}}, but these are only used for shorter spans and can flex significantly.{{cn}}
 The title text suggests a gradual introduction of this new form of bridge, a practice which is common when introducing new large-scale societal changes. According to Randall, the bridges would at first be a sort of hybrid between the old and new design, where any driver could choose between taking the catenary curve or driving along the tried-and-true flat road. As more and more people sample the "fun jumps" path, he claims, word will spread about how much 'better' this path is, and once it's been widely adopted, the flat road will be discontinued. In reality, a more likely result would be that drivers who take the catenary curve quickly spread word about how ''dangerous'' this path is (and/or spread themselves, and their wrecked vehicles, all around the terrain that the bridge is supposed to cross), and any usage would quickly disappear.

@@ Line 13: / Line 13: @@
 A {{w|suspension bridge}} works by exploiting the strength in tension of a cable, or series of links, in what is ''usually'' described as a {{w|catenary}} curve (but see later) suspended between towers or other elevated positions and firmly anchored to the ground at either end. Such a cable, or parallel cables, can span a large gap, across which an {{w|Arch_bridge|arch}} (with compressive forces) or {{w|Cantilever_bridge|cantilever}} (with compression below and tension above) bridge structure would be more difficult. The slung droop of the connection, and various other issues (the susceptibility to resonance from moving loads, as well as the sheer impracticality of travelling along this link) means that the surface of the usual road itself (or footway, in the case of a {{w|Arouca 516|non-vehicular bridge}}) is suspended from this cable by vertical (and perhaps diagonal) suspending stringers of suitable lengths to maintain a more level track. This usually means that the greatest clearance beneath the traversable part of the bridge is not far below the middle of the main curve of the cable, which has the closest (or direct) attachment to the bridging 'deck'. Unlike the free-hanging cable, the addition of the weight of the road and the large number of vertical cables required now forces the cable to take the path of a similar parabolic curve, rather than a true catenary, and may also have to further flex significantly according to wind, temperature and the changing loads of passing traffic with significant mass.
-Randall suggests 'improving' the suspension bridge by having ''just'' the catenary curve, needing much less structure, and giving an increased clearance for anything passing beneath (in this case, a tall-masted sailboat) if they pass closer to the supporting towers. This, of course, means that the traffic can ''only'' cross upon the cables themselves, in a way that is not explained at all by this side-section view. Due to the steep nature of the way the cable must pass over the supports, this produces a steep gradient up to and then down from the tower which sends traffic temporarily onto a free ballistic trajectory, assuming it has enough speed. This is described as "fun jumps", {{w|Bug (engineering)#"It's not a bug, it's a feature"|as if it is how bridges ''should'' work}}. This would likely inflict damage on the car, and might result in unfortunate accidents. Some bridges are designed for traffic to go on top with a {{w|Stressed ribbon bridge|cable underneath}}, but these are only used for shorter spans and can flex significantly.{{cn}}
+Randall suggests 'improving' the suspension bridge by having ''just'' the catenary curve, needing much less structure, and giving an increased clearance for anything passing beneath (in this case, a tall-masted sailboat) if they pass closer to the supporting towers. This, of course, means that the traffic can ''only'' cross where the upper cables themselves were, seemingly having been replaced judging by the double lines in this side-section view. Due to the steep nature of the way the cable must pass over the supports, this produces a steep gradient up to and then down from the tower which sends traffic temporarily onto a free ballistic trajectory, assuming it has enough speed. This is described as "fun jumps", {{w|Bug (engineering)#"It's not a bug, it's a feature"|as if it is how bridges ''should'' work}}. This would likely inflict damage on the car, and might result in unfortunate accidents. Some bridges are designed for traffic to go on top with a {{w|Stressed ribbon bridge|cable underneath}}, but these are only used for shorter spans and can flex significantly.{{cn}}
 The title text suggests a gradual introduction of this new form of bridge, a practice which is common when introducing new large-scale societal changes. According to Randall, the bridges would at first be a sort of hybrid between the old and new design, where any driver could choose between taking the catenary curve or driving along the tried-and-true flat road. As more and more people sample the "fun jumps" path, he claims, word will spread about how much 'better' this path is, and once it's been widely adopted, the flat road will be discontinued. In reality, a more likely result would be that drivers who take the catenary curve quickly spread word about how ''dangerous'' this path is (and/or spread themselves, and their wrecked vehicles, all around the terrain that the bridge is supposed to cross), and any usage would quickly disappear.

@@ Line 13: / Line 13: @@
 A {{w|suspension bridge}} works by exploiting the strength in tension of a cable, or series of links, in what is ''usually'' described as a {{w|catenary}} curve (but see later) suspended between towers or other elevated positions and firmly anchored to the ground at either end. Such a cable, or parallel cables, can span a large gap, across which an {{w|Arch_bridge|arch}} (with compressive forces) or {{w|Cantilever_bridge|cantilever}} (with compression below and tension above) bridge structure would be more difficult. The slung droop of the connection, and various other issues (the susceptibility to resonance from moving loads, as well as the sheer impracticality of travelling along this link) means that the surface of the usual road itself (or footway, in the case of a {{w|Arouca 516|non-vehicular bridge}}) is suspended from this cable by vertical (and perhaps diagonal) suspending stringers of suitable lengths to maintain a more level track. This usually means that the greatest clearance beneath the traversable part of the bridge is not far below the middle of the main curve of the cable, which has the closest (or direct) attachment to the bridging 'deck'. Unlike the free-hanging cable, the addition of the weight of the road and the large number of vertical cables required now forces the cable to take the path of a similar parabolic curve, rather than a true catenary, and may also have to further flex significantly according to wind, temperature and the changing loads of passing traffic with significant mass.
-Randall suggests 'improving' the suspension bridge by having ''just'' the catenary curve, needing much less structure, and giving an increased clearance for anything passing beneath (in this case, a tall-masted sailboat) if they pass closer to the supporting towers. This, of course, means that the traffic can ''only'' cross upon the cables themselves, in a way that is not explained at all by this side-section view. Due to the steep nature of the way the cable must pass over the supports, this produces a steep gradient up to and then down from the tower which sends traffic temporarily onto a free ballistic trajectory, assuming it has enough speed. This is described as "fun jumps", {{w|Bug (engineering)#"It's not a bug, it's a feature"|as if it is how bridges ''should'' work}}. This would likely inflict damage on the car, and might result in unfortunate accidents. Some bridges are designed for traffic to go on top with a {{w|Stressed ribbon bridge|cable underneath}}, but these are only used for shorter spans and can flex significantly. {{cn}}
+Randall suggests 'improving' the suspension bridge by having ''just'' the catenary curve, needing much less structure, and giving an increased clearance for anything passing beneath (in this case, a tall-masted sailboat) if they pass closer to the supporting towers. This, of course, means that the traffic can ''only'' cross upon the cables themselves, in a way that is not explained at all by this side-section view. Due to the steep nature of the way the cable must pass over the supports, this produces a steep gradient up to and then down from the tower which sends traffic temporarily onto a free ballistic trajectory, assuming it has enough speed. This is described as "fun jumps", {{w|Bug (engineering)#"It's not a bug, it's a feature"|as if it is how bridges ''should'' work}}. This would likely inflict damage on the car, and might result in unfortunate accidents. Some bridges are designed for traffic to go on top with a {{w|Stressed ribbon bridge|cable underneath}}, but these are only used for shorter spans and can flex significantly.{{cn}}
 The title text suggests a gradual introduction of this new form of bridge, a practice which is common when introducing new large-scale societal changes. According to Randall, the bridges would at first be a sort of hybrid between the old and new design, where any driver could choose between taking the catenary curve or driving along the tried-and-true flat road. As more and more people sample the "fun jumps" path, he claims, word will spread about how much 'better' this path is, and once it's been widely adopted, the flat road will be discontinued. In reality, a more likely result would be that drivers who take the catenary curve quickly spread word about how ''dangerous'' this path is (and/or spread themselves, and their wrecked vehicles, all around the terrain that the bridge is supposed to cross), and any usage would quickly disappear.

← Older revision		Revision as of 23:26, 19 February 2025
Line 10:		Line 10:

	==Explanation==		==Explanation==
−	~~{{incomplete\|Created by a BOT JUMPING ON A BRIDGE - Needs explanation of title text. Do NOT delete this tag too soon.}}~~

	A {{w\|suspension bridge}} works by exploiting the strength in tension of a cable, or series of links, in what is ''usually'' described as a {{w\|catenary}} curve (but see later) suspended between towers or other elevated positions and firmly anchored to the ground at either end. Such a cable, or parallel cables, can span a large gap, across which an {{w\|Arch_bridge\|arch}} (with compressive forces) or {{w\|Cantilever_bridge\|cantilever}} (with compression below and tension above) bridge structure would be more difficult. The slung droop of the connection, and various other issues (the susceptibility to resonance from moving loads, as well as the sheer impracticality of travelling along this link) means that the surface of the usual road itself (or footway, in the case of a {{w\|Arouca 516\|non-vehicular bridge}}) is suspended from this cable by vertical (and perhaps diagonal) suspending stringers of suitable lengths to maintain a more level track. This usually means that the greatest clearance beneath the traversable part of the bridge is not far below the middle of the main curve of the cable, which has the closest (or direct) attachment to the bridging 'deck'. Unlike the free-hanging cable, the addition of the weight of the road and the large number of vertical cables required now forces the cable to take the path of a similar parabolic curve, rather than a true catenary, and may also have to further flex significantly according to wind, temperature and the changing loads of passing traffic with significant mass.		A {{w\|suspension bridge}} works by exploiting the strength in tension of a cable, or series of links, in what is ''usually'' described as a {{w\|catenary}} curve (but see later) suspended between towers or other elevated positions and firmly anchored to the ground at either end. Such a cable, or parallel cables, can span a large gap, across which an {{w\|Arch_bridge\|arch}} (with compressive forces) or {{w\|Cantilever_bridge\|cantilever}} (with compression below and tension above) bridge structure would be more difficult. The slung droop of the connection, and various other issues (the susceptibility to resonance from moving loads, as well as the sheer impracticality of travelling along this link) means that the surface of the usual road itself (or footway, in the case of a {{w\|Arouca 516\|non-vehicular bridge}}) is suspended from this cable by vertical (and perhaps diagonal) suspending stringers of suitable lengths to maintain a more level track. This usually means that the greatest clearance beneath the traversable part of the bridge is not far below the middle of the main curve of the cable, which has the closest (or direct) attachment to the bridging 'deck'. Unlike the free-hanging cable, the addition of the weight of the road and the large number of vertical cables required now forces the cable to take the path of a similar parabolic curve, rather than a true catenary, and may also have to further flex significantly according to wind, temperature and the changing loads of passing traffic with significant mass.

@@ Line 12: / Line 12: @@
 {{incomplete|Created by a BOT JUMPING ON A BRIDGE - Needs explanation of title text. Do NOT delete this tag too soon.}}
-A {{w|suspension bridge}} works by exploiting the strength in tension of a cable, or series of links, in what is ''usually'' described as a {{w|catenary}} curve (but see later) suspended between towers or other elevated positions and firmly anchored to the ground at either end. Such a cable, or parallel cables, can span a large gap, across which an arch (with compressive forces) or cantilever (with compression below and tension above) bridge structure would be more difficult. The slung droop of the connection, and various other issues (the susceptibility to resonance from moving loads, as well as the sheer impracticality of travelling along this link) means that the surface of the usual road itself (or footway, in the case of a {{w|Arouca 516|non-vehicular bridge}}) is suspended from this cable by vertical (and perhaps diagonal) suspending stringers of suitable lengths to maintain a more level track. This usually means that the greatest clearance beneath the traversable part of the bridge is not far below the middle of the main curve of the cable, which has the closest (or direct) attachment to the bridging 'deck'. Unlike the free-hanging cable, the addition of the weight of the road and the large number of vertical cables required now forces the cable to take the path of a similar parabolic curve, rather than a true catenary, and may also have to further flex significantly according to wind, temperature and the changing loads of passing traffic with significant mass.
+A {{w|suspension bridge}} works by exploiting the strength in tension of a cable, or series of links, in what is ''usually'' described as a {{w|catenary}} curve (but see later) suspended between towers or other elevated positions and firmly anchored to the ground at either end. Such a cable, or parallel cables, can span a large gap, across which an {{w|Arch_bridge|arch}} (with compressive forces) or {{w|Cantilever_bridge|cantilever}} (with compression below and tension above) bridge structure would be more difficult. The slung droop of the connection, and various other issues (the susceptibility to resonance from moving loads, as well as the sheer impracticality of travelling along this link) means that the surface of the usual road itself (or footway, in the case of a {{w|Arouca 516|non-vehicular bridge}}) is suspended from this cable by vertical (and perhaps diagonal) suspending stringers of suitable lengths to maintain a more level track. This usually means that the greatest clearance beneath the traversable part of the bridge is not far below the middle of the main curve of the cable, which has the closest (or direct) attachment to the bridging 'deck'. Unlike the free-hanging cable, the addition of the weight of the road and the large number of vertical cables required now forces the cable to take the path of a similar parabolic curve, rather than a true catenary, and may also have to further flex significantly according to wind, temperature and the changing loads of passing traffic with significant mass.
 Randall suggests 'improving' the suspension bridge by having ''just'' the catenary curve, needing much less structure, and giving an increased clearance for anything passing beneath (in this case, a tall-masted sailboat) if they pass closer to the supporting towers. This, of course, means that the traffic can ''only'' cross upon the cables themselves, in a way that is not explained at all by this side-section view. Due to the steep nature of the way the cable must pass over the supports, this produces a steep gradient up to and then down from the tower which sends traffic temporarily onto a free ballistic trajectory, assuming it has enough speed. This is described as "fun jumps", {{w|Bug (engineering)#"It's not a bug, it's a feature"|as if it is how bridges ''should'' work}}. This would likely inflict damage on the car, and might result in unfortunate accidents. Some bridges are designed for traffic to go on top with a {{w|Stressed ribbon bridge|cable underneath}}, but these are only used for shorter spans and can flex significantly. {{cn}}

@@ Line 24: / Line 24: @@
 :Traditional suspension bridge:
-:[Beneath this a different version of a suspension bridge is drawn. It spans the same water way, and also has the same two towers. But here ends the similarities. Instead of suspension cables holding a straight road, the road is now build in the same curve that the cables had in the first drawing. So the cars need to drive up to the top of the towers along a curves road and then down again in the middle between the towers. There are thus no cables of any kind. And no straight road at a fixed height above the water. On this hilly road there are also ten vehicles going either way. To the left three regular cars are driving up the steep incline toward the left tower. A fourth car has just past over the top, and a dotted line behind it indicates that it is flying above the road after having speed over the top. In the middle of the road between the towers where it is closest to the water, there is a large truck also going towards the right. Near the top of the right tower another regular car is driving up the incline.  Just above it near the top of the right tower another car has made a large jump out from the top of the tower going left, a dotted line indicating a quite high jump taking it a couple of car heights above the top of the tower. On the right side of the tower, two cars (one very small) drives left up towards the tower and behind them a final car drives down towards the right bank. There are three labels. The first is beneath the first section of the bridge to the left, where three arrows points to the underside of the road with the label beneath these arrows. The second is just right of the left tower where a double arrow indicate the height of the road above the water. An arrow point up to this arrow from the label that are written down in the water. Near the right tower, in the same spot as the double arrow is near the left tower, there is a sail boat with a high sail that can pass under the road near the tower, where the road is higher up than in the middle (or all the way in the normal version drawn above). The third label is written above the right tower, where an arrow points from the label to the dotted line of the car that makes the high jump from the top of the tower. Above the drawing is a caption:]
+:[Beneath this a different version of a suspension bridge is drawn. It spans the same water way, and also has the same two towers. But here ends the similarities. Instead of suspension cables holding a straight road, the road is now build in the same curve that the cables had in the first drawing. So the cars need to drive up to the top of the towers along a curves road and then down again in the middle between the towers. There are thus no cables of any kind. And no straight road at a fixed height above the water. On this hilly road there are also ten vehicles going either way. To the left three regular cars are driving up the steep incline toward the left tower. A fourth car has just past over the top, and a dotted line behind it indicates that it is flying above the road after having speed over the top. In the middle of the road between the towers where it is closest to the water, there is a large truck also going towards the right. The road is clearly bending under the weight of the truck. Near the top of the right tower another regular car is driving up the incline.  Just above it near the top of the right tower another car has made a large jump out from the top of the tower going left, a dotted line indicating a quite high jump taking it a couple of car heights above the top of the tower. On the right side of the tower, two cars (one very small) drives left up towards the tower and behind them a final car drives down towards the right bank. There are three labels. The first is beneath the first section of the bridge to the left, where three arrows points to the underside of the road with the label beneath these arrows. The second is just right of the left tower where a double arrow indicate the height of the road above the water. An arrow point up to this arrow from the label that are written down in the water. Near the right tower, in the same spot as the double arrow is near the left tower, there is a sail boat with a high sail that can pass under the road near the tower, where the road is higher up than in the middle (or all the way in the normal version drawn above). The third label is written above the right tower, where an arrow points from the label to the dotted line of the car that makes the high jump from the top of the tower. Above the drawing is a caption:]
 :Improved suspension bridge:
 :[Label 1:] Less cable