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ID:52218339
大小:1.18 MB
页数:5页
时间:2020-03-25
《斜拉桥承载力的评定方法.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第31卷第3期2014年3月公路交通科技JournalofHighwayandTransportationResearchandDevelopmentV01.31No.3Mar.2014doi:10.3969/j.issn.1002-0268.2014.03.011斜拉桥承载力的评定方法赵敏1,王凡2(西安工业大学建筑工程学院,陕西西安710032)摘要:以某斜拉桥为试验对象,介绍了预应力混凝土斜拉桥承载力的评定方法。通过静载和动载试验,获得了桥梁控制截面的应变、挠度等随加载变化的情况;通过理论值与试验值的对比分析,对
2、桥梁的承载能力和安全性能进行了研究,以检验桥梁结构在试验荷载作用下的实际受力状况是否满足设计及规范要求。结果表明:各测点应变、挠度、索塔偏位和索力测试校验系数均满足规范关于校验系数的规定;桥梁结构的实际刚度能满足公路I级荷载使用要求,且有一定的安全储备;试验结构实测残余挠度均不大于20%,表明结构在试验荷载作用下尚处于弹性工作状态;以动载试验和测量数据建立的模型分析可知桥梁振动正常,实测结构阻尼反映其阻尼系数较小,说明桥梁结构振动衰减正常,无明显结构损伤缺陷,试验桥梁符合规范要求。关键词:桥梁工程;承载力;模态实验:M
3、IDAS计算;斜拉桥中图分类号:U448.271+.2文献标识码:A文章编号:1002—0268(2014)03—0065—05AnEvaluationMethodofBearingCapacityofCable·stayedBridgeZHAOMinl,WANGFan2(SchoolofArchitecturalEngineering,Xi’anTechnologicalUniversity,Xi’anShaanxi710032,China)Abstract:Takingacable—stayedbridgeasth
4、eexperimentobject,theevaluationmethodofbearingcapacityofprestressedconcretecable-stayedbridgeisintroduced.Basedonstaticanddynamicloadingexperiment,theregularityofstrainanddeflectionofthecontrolingsectionvaryingwithloadingisfound.Throughcomparingthetheoreticalval
5、uewithexperimentalvalue,thebearingcapacityandthesafetyproformanceofthebridgeareanalysedtotestwhetherthebridgestructureinactualstressstatemeettherequirementsofthedesignandtherelativespecification.Theresultshowsthat(1)allthecalibrationcoefficientsofstrain,deflecti
6、on,cablepylondeviationandcableforcetestingofeachmeasuringpointmeetthestipulationinspecification;(2)theactualstiffnessofthebridgecansatisfytheservicerequirementofhighwayloadclassI,andhascertainsafetyreservation;(3)themeasuredresidualdeflectionsoftheteststructurea
7、renotgreaterthan20%,whichmeansthatthestructureisstillintheelasticworkingstateundertestload.Usingthemodelestablishedbydynamicloadtestandmeasurementdata,theanalysisresultshowsthatthebridgevibrationisnormal,themeasuredstructuraldampingreflectssmalldampingcoefficien
8、t,thebridgestructurevibrationattenuationisnormal,noobviousstructuraldamagedefect,theexperimentbridgemeettherequirementintherelativespecification.Keywords:嫡dgeengineer
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