大跨梁桥施工全过程地震响应非线性影响分析

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1、第4O卷，第6期公路工程Vo1．40．No．62015年12月HighwayEngineeringDee．，2015大跨梁桥施工全过程地震响应非线性影响分析郑玉国，袁万城，罗阳青。(1．湖南科技大学土木工程学院，湖南湘潭411201；2．同济大学土木工程防灾国家重点实验室，上海200092；3．湖南省交通科学研究院，湖南长沙410015)[摘要]考虑各种非线性因素影响，对三座典型大跨连续梁桥，花瓶型实体桥墩桥梁、矩形空心薄壁桥墩桥梁和双柱实体桥墩桥梁进行施工全过程非线性时程分析，评价非线性因素对大跨梁桥施工全过程地震响应的影响程度。研究结果表明，非线性时

2、程分析的地震响应峰值主要集中于8梁段、9梁段、边跨合拢、体系转换、中跨合拢和桥面施工等阶段，在抗震设计过程中应予重点关注。总体上矩形空心薄壁桥墩桥梁在整个施工过程中表现出较大的抗震刚度，双柱实体桥墩桥梁次之，花瓶型实体桥墩桥梁最小。各种非线性因素对桥梁的地震响应随施工阶段推进而变化的规律影响不大，对大跨梁桥施工全过程地震响应的数值大小影响明显。[关键词】大跨梁桥；施工全过程；时程分析；非线性；影响程度[中图分类号]U448．215[文献标识码]A(文章编号]1674—0610(2015)06—0030—06NonlinearInfluencingAnal

3、ysesofLongSpanGirderBridge’SSeismicResponseforWholeConstructionProcessZHENGYuguo，YUANWancheng，LUOYangqing(1．SchoolofCivilEngineering，HunanUniversityofScienceandTechnology，Xiangtan，Hunan411201，China；2．StateKeyLaboratoryforDisasterReductioninCivilEngineering，Ton~iUniversity，Shangha

4、i200092，China；3．HunanCommunicationsResearchInstitute，Changsha，Hunan410015，China)[Abstract]Consideringkindsofnonlinearfactors，thenonlineartimehistoryanalysesforwholecantileverconstructionwerestudiedandcomparedwitheachotherforthreelongspantypicalcontinuousgirderbridges，thevase-type

5、solidpierbridge，thethin—walltyperectangularhollowpierbridgeandthedouble—columntypesolidpierbridge．Andtheinfluencingdegreeofthenonlinearfactorswasevaluatedfortheseismicresponsesofthewholeconstructionprocess．Theresultsshowthattheseismicresponsepeaksmainlyfocusonthe8#9#girdersegment

6、thesidespanclosure，thesystemtransformation，themiddlespan，，closureandthedeckconstructionstages，whichshouldbepaidmoreattentioninseismicdesign．Thebridgewiththethin—walltyperectangularhollowpiershasthemaximumseismicstiffnessinagreatdegree，thebridgewiththedouble—columntypesolidpiersta

7、kessecondplaceandthebridgewiththevase—typesolidpiershastheminimumstiffness．Thenonlinearfactorshavelittleinfluenceonthevariationlawoftheseismicresponsesalongwiththeconstructionstages．Howeverthenu—mericalvaluesoftheseismicresponsesareinfluencedobviouslybythenonlinearfactorsforthewh

8、oleconstructionprocess．[Keywords]longspa