# Tag Info

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The next time you see some kids playing jump rope, go out and ask them to hold the rope perfectly straight. If two kids hold the two ends of the rope with it dangling until it is almost on the ground, they have to hold the ends of the rope up but they don't have to pull much, end to end. The straighter the rope is, the more they will have to pull. If you ...

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A suspension bridge cable is the most effective use of material. Because it uses high tensile cables in a position where they are the most effective material: tension. The parabolic shape is the closest natural geometry a cable assumes under uniformly distributed horizontal load ( not the self-weight, that is a catenary curve). It has reduced the structure ...

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It looks like a prestressed cable anchor.

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Consider this simplified analogue to a suspension bridge: we model the roadway as a single point mass $m$, which is suspended from a rope attached to the cables. Now think about what's the best angle for the cable to make at the attachment point: completely straight, or hanging through a bit? The answer is, it must hang down at least a bit. Recall that ...

2

To understand the hyperstatic moment, we need to first remember that prestress is, by definition, the application of an internal stress state on the beam. Therefore, it cannot generate external loads on the beam. That is, if you had a beam floating in space and then you applied some prestress to that beam, it would deform but not present any rigid body ...

1

Creep in concrete is when under sustained load, strain increases without an increase in the load. Excessive creep can lead to unacceptable deformation, redistribution of the stresses, even collapse of the structure. Creep is generally recoverable after removing the load. It has to do with the structural deformation of the Concrete matrix under constant long ...

1

Hooks are used in many situations in RC. They are used for example in column beam intersection to give ductility and confinement of the joint in case of an earthquake. They are used in beams and columns for transition or when there is not enough bonding strength length available, by developing tension in confined areas, or they are used at the end of the ...

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A suspension bridge is an efficient use of material, because all the forces in the structure are carried by tension, and not by the parts of the structure resisting bending. Beams which resist bending are often useful components of structures, but they are an inefficient way to use material because the stress in the beam is not constant through its depth, ...

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It's not possible for the cable to be perfectly horizontal. Cable can only pull; that is, the force they apply at a connection point is along the direction of the cable at that point. So a horizontal cable would be able to exert only a horizontal force. But the cable needs to transmit the weight of the bridge, and to do that it must apply a force with a ...

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