Optimization method for lower deflection treatment of continuous beam bridge with variable cross-section in vitro and in vivo

Abstract

The invention discloses an optimization method for lower deflection treatment of continuous beam bridge with variable cross-section in vitro and in vivo. The method comprises: step S1, establishing afinite element model of the in vivo-in vitro mixed-beam variable-section continuous beam bridge; according to the continuous beam bridge Based on the parameters and the layout of the interface, the finite element analysis software ANSYS is used to establish the spatial finite element model of the in vitro and in vitro beam-variable continuous beam bridge, and the performance and parameter analysisof the bridge after the bridge is calculated and analyzed; Step S2, under the continuous beam bridge The influencing factors of the bending behavior and the analysis of the parameters of the mixed beam treatment; Step S3, optimization of the continuous rigid frame bridge of the in vitro and in vivo hybrids. The invention has the advantages of simple principle, accurate calculation, obvious effectand good application value.

Description

technical field [0001] The invention mainly relates to the field of bridge optimization, in particular to an optimization method for treating down deflection of a continuous girder bridge with variable cross-section mixed with internal and external beams. Background technique [0002] At present, the main defects of long-span prestressed concrete continuous girder (rigid frame) bridges at home and abroad include: the deflection of the main span will cause the alignment of the bridge surface to be uneven, and cause the box girder cracks to widen and elongate, and new cracks to appear continuously, resulting in The reduction of structural rigidity will further promote the downward deflection of the main span. The cracking of the beam body and the deflection of the main span interact with each other, forming a vicious circle. Although measures such as increasing the pre-camber of the finished bridge and closing and pushing are usually used in the construction control process o...

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Problems solved by technology

[0005] However, due to the late application of the external prestressing system in my country, compared with the extensive application of the internal prestressing technology in engineering, the research on the design method of the continuous rigid frame bridge with variable cross-section cantilever-casting with internal-external hybrid distribution in my country is carried out. There are still few, and there is no corresponding specification for the design of such bridges

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