A method for determining the cross-sectional area of ​​a continuous girder bridge and its cables and the rigidity of elastic bodies

Abstract

The invention discloses a continuous girder bridge and a method for determining the cross-sectional area and spring rigidity of a drag cable thereof, belonging to the field of civil engineering. The pier cover girder of the continuous girder bridge is provided with symmetrical through hole groups, the through hole group includes two through holes, and sleeves are installed on the through holes; The stay cable is parallel to the continuous main girder; with the center of the pier top of the fixed pier as the origin, the near-origin end of the stay cable is provided with a first pressure block and the first anchorage, and the far-origin end of the stay cable is sequentially provided with The second pressing block, the elastic body and the second anchor, the first pressing block and the second pressing block are closer to the center of the stay cable than the first anchoring means and the second anchoring means. Under the earthquake excitation along the direction of the bridge, the non-fixed piers cooperate with the fixed piers to share the seismic load, which reduces the damage risk of the fixed piers of the continuous girder bridge, and at the same time makes the bending moment distribution of each bridge pier basically uniform, giving full play to the performance of each pier. Seismic performance, thus improving the seismic performance of the continuous girder bridge.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a continuous girder bridge and a method for determining the cross-sectional area of ​​its stay cables and the stiffness of an elastic body. Background technique [0002] The continuous girder bridge generally includes the upper continuous main girder, the lower pier and the pier cover girder on the pier. The continuous main girder and the pier cover girder are connected by fixed bearings or sliding bearings. Both fixed and sliding bearings are used to constrain the horizontal movement of the continuous girder. When the continuous girder and the pier cover girder are connected by a fixed support, the corresponding pier is called a fixed pier; when the continuous girder and the pier cover girder are connected by a sliding support, the continuous girder can correspond to the pier The horizontal movement of the cap beam corresponds to the bridge piers called non-fixed piers. Usuall...

AI Technical Summary

Problems solved by technology

[0003] However, under the forward earthquake excitation, the horizontal inertia force generated by the continuous girder is almost entirely borne by the fixed pier, resulting in excessive bending moment at the bottom of the fixed pier, which is very prone to damage

In addition, due to the different stiffness of the piers, the assigned seismic bending moments are also different. It is easy to cause the pier with excessive bending to fail first, while the rest of the piers are still intact. The seismic performance of each pier cannot be fully utilized, resulting in the destruction of one pier. bridge disabled

Images