2 0 0 m 级预应力混凝土梁桥空间应力分析

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关键词：大跨度连续梁桥；有限分析；应力分布中图分类号：U448 文献标志码：ADOI：10.19968/j.cnki.hnkj.1003-5168.2025.07.014文章编号：1003-5168（2025）07-0069-08

Spatial Stress Analysisof 2oO-meter Prestressed Concrete Girder Bridge

XUYuan LI ShangwuXIAWei （XinjiangBeixin Road and Bridge Group Co.，Ltd.，Urumqi 83ooO2，China）

Abstract：[Purposes] With the increase of bridge spans，the traditional design and construction codes can no longer adequately cope with the new challenges.Therefore，the influence of prestressloss on the spatial distribution characteristics of structural stresses during the construction stage of 2OO-meter-class mega-span continuous girder bridges is explored，with aview to providing a more accurate theoretical basis and practical guidance for the design and construction of medium-to-large spanbridges.[Methods]ABAQUS finite element software is used to systematically analyze the effect of prestress loss on the stress distribution and deformation of the structure by adjusting the magnitude of prestress load based on the normal construction process of bridge formation for a 2OO-meter class continuous girder bridge.In the research process，the bridge response under diferent prestressing conditions is simulated in combination with different construction stages to ensure the scientificityand practicabilityof the research results.[Findings]Theresults of thestudy showed thatprestress loss significantly afected the stress distribution and deflection characteristics of the 2OO-meter class continuous girder bridge.The downward deflection and stress concentration of the bridge increased under the reduced prestressload，especially near the supports，indicating that the reasonable control of prestress is crucial forthe overallsafety and serviceabilityof thebridge.[Conclusions]This study reveals the critical influence of prestressloading on the structural performance ofbridges through an in-depthanalysis of theprestress loss of 2OO-meter-class mega-span continuous girder bridges.The results of the study provide an important theoretical basis for future bridge design and construction.

Keywords：long-span continuous girder bridge;finite element analysis;stress distribution

0 引言

一般来说，在计算分析预应力混凝土连续梁桥时，常常采用专门用于桥梁的杆系模型，但是这种二维杆系模型通常会忽略结构空间效应。（剩余6259字）