下穿铁路桥涵框架混凝土施工过程中结构对混凝土温度场与应力场的影响研究

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中图分类号：U455.43 文献标志码：A 文章编号：2095-2945（2025）18-0037-04

Abstract：Inthispaper，theinfluenceof thestructureonthetemperaturefieldandstressfieldoftheconcreteduring the constructionofunder-crossingrailwaybridgesandculverts，combinedwithnumericalsimulation，thestructureshowsthatthe concretematerialisadurablematerial，butitisessentiallyanon-uniformporousmaterial.Fordiferentconstruction environments，appropriateconcretematerialsshouldbeselectedtomakebeteruseoftheconcretepropertiesandcontrolthe occurrenceofcracks；whenconsideringstructuralcracks，thegreaterthetemperaturediference，thegreaterthethermalstre. Duringtheconstructionofframeboxculverts，specialatentionshouldbepaidtothecornersandcomerpointsonboth sides alongthehorizontaldirectionontheconcreteflor，whichisthemainpositionofthemaximumtensilestress；whencarryingout stressanalysisonthediagonalframesystem，thetemperaturestressanalysisatdiferentanglesismainlycarredoutby convertingtheobliqueintersectiontotheforwardintersection.Itanbeknownthroughnumericalsimulation，itisconcludedthat thelargerthediagonalangle，thehigherthetemperatureatthecenterofthewall，whichleadstogreatertemperaturetressand lower the crack suppression effect.

Keywords： frame bridge; crack；numerical simulation; concrete; temperature field; stress field

近年来，随着国内经济的发展，土木行业也在不断发展，在施工中常伴有改建或扩建等一些工程建筑项目，根据不同的施工项目，对不同的施工工艺提出相应的要求，即需要在不影响工程设施上方铁路或公路正常运行的条件下完成施工。（剩余4203字）