钢桥面板重焊修复后残余应力数值分析.pdf

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1、桥梁建设２０１６年第４６卷第５期（总第２４０期）１００BridgeConstruction，Vol．４６，No．５，２０１６（TotallyNo．２４０）文章编号：１００３－４７２２（２０１６）０５－０１００－０５钢桥面板重焊修复后残余应力数值分析１１２蒋永，吴冲，钱骥（１．同济大学桥梁工程系，上海２０００９２；２．重庆交通大学桥梁工程系，重庆４０００７４）摘要：为研究重焊修复大尺寸钢桥面板上RD裂缝（纵肋与盖板接头处贯穿桥面板的裂缝）对桥面板结构性能的影响，选取国内桥梁工程中早期较常用的１２mm钢桥面板进行分

2、析。采用ANSYS对重焊过程进行模拟，引入子结构算法分析钢桥面板重焊后的残余应力，并建立重焊工艺参数与残余应力场的关系。结果表明：重焊修复钢桥面板上的RD裂缝时，残余拉应力峰值接近材料的屈服强度，焊缝区纵向残余拉应力区域宽度接近原始焊缝残余拉应力区域宽度的４倍；焊趾处纵向残余应力随开坡口长度的增加而减小、随开坡口角度的增加而增大，其与开坡口长度、开坡口角度之间均满足幂函数关系。关键词：钢桥面板；RD裂缝；重焊修复；残余应力；参数分析；子结构算法；有限元法中图分类号：U４４３．３１；U４４５．６文献标志码：ANu

3、mericalAnalysisofResidualStressofReweldedandRepairedSteelBridgeDeckPlate１１２JIANGYong，WUChong，QIANJi（１．DepartmentofBridgeEngineering，TongjiUniversity，Shanghai２０００９２，China；２．DepartmentofBridgeEngineering，ChongqingJiaotongUniversity，Chongqing４０００７４，China）Abstra

4、ct：Tostudytheinfluencesoftherib‐to‐deck（RD）cracks（thecracksthroughthesteelbridgedeckplateatthejointofthelongitudinalribandthedeckplate）inthereweldedandre‐pairedlargesizesteelbridgedeckplateonthestructuralperformanceofthebridgedeck，the１２mmthickdeckplatethatwa

5、scommonlyusedforthedomesticbridgesattheearlytimewasselect‐edforanalysis．TheANSYSwasusedtosimulatethereweldingprocess，theresidualstressofthereweldeddeckplatewasanalyzedbywayofintroducingthesubstructurealgorithmandtherela‐tionshipbetweenthereweldingprocedurepa

6、rametersandtheresidualstressfieldwasestablished．TheresultsshowthatwhentheRDcracksinthesteelbridgedeckplatearereweldedandrepaired，thepeakvaluesoftheresidualtensilestressofthedeckplateapproachtotheyieldstrengthofthematerial．Thewidthofthelongitudinalresidualten

7、silestressareaintheweldingseamareaapproa‐chestothe４timesofthewidthoftheresidualtensilestressareaoftheoriginalweldingseam．Thelongitudinalresidualstressattheweldingtoedecreaseswiththeincreaseofthegroovelengthandincreaseswiththeincreaseofthegrooveanglesandthere

8、sidualstress，thegroovelengthandgrooveanglescanmeettherelationshipofpowerfunction．Keywords：steelbridgedeckplate；RDcrack；reweldedandrepaired；residualstress；para‐metricanalysis；substructurealgorith