Continuous beam bridge and method for determining inhaul cable sectional area and elastomer rigidity thereof

Abstract

The invention discloses a continuous beam bridge and a method for determining an inhaul cable sectional area and elastomer rigidity thereof, and belongs to the field of civil engineering. Symmetricalthrough hole sets are formed in pier cap beams of the continuous beam bridge, each through hole set comprises two through holes, and casing pipes are installed in the through holes; a cable connectingdevice comprises inhaul cables which penetrate through the casing pipes on the adjacent pier cap beams respectively, and the inhaul cables are parallel to a continuous main beam; the pier top centersof fixed piers serves as original points, first pressing blocks and first anchorage devices are arranged at the ends, close to the original points, of the inhaul cables, and second pressing blocks, elastomers and second anchorage devices are sequentially arranged at the ends, away from the original points, of the inhaul cables, and the first pressing blocks and the second pressing blocks are closer to the centers of the inhaul cables than the first anchorage devices and the second anchorage devices respectively. According to the continuous beam bridge, under the earthquake excitation effect in the axial direction of the bridge, non-fixed piers cooperate with the fixed piers to share earthquake loads together, the destruction risk of the fixed piers of the continuous beam bridge is reduced, meanwhile, the bending moment distribution of the piers is basically uniform, and the anti-seismic properties of the piers are brought into play, therefore the anti-seismic properties of the continuous beam bridge are improved.

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...

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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

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