欢迎来到天天文库
浏览记录
ID:38266287
大小:309.03 KB
页数:5页
时间:2019-05-27
《不平整度桥面下连续梁桥车桥耦合振动分析》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、不平整度桥面下连续梁桥车桥耦合振动分析施颖,宣纪明,宋一凡15文章编号:1003—4722(2009)06—0015—04不平整度桥面下连续梁桥车桥耦合振动分析施颖,宣纪明,宋一凡(1.长安大学公路学院,陕西西安710064;2.浙江工业大学建筑工程学院,浙江杭州310014)摘要:现行《公路桥涵设计通用规范》采用结构基频来计算桥梁结构的冲击系数,而基频的计算宜采用有限元方法,但如何计算,规范没有明示;而且规范给定的连续梁基频估算公式不分直桥和弯桥;再者按规范基频估算公式计算冲击系数的值有待商榷。采用一种基于有限元通用分析软件ANSYS
2、来实现公路桥车桥耦合振动数值分析方法,对弯桥车桥耦合振动影响因素进行分析,然后分别对直线和曲线连续梁桥考虑了桥面不平整度后车桥耦合振动进行计算。分析结果表明,直桥和弯桥的动力系数不同,换算成冲击系数均大于连续梁按规范给定的基频估算值计算的冲击系数。关键词:车桥耦合振动;有限元法;曲梁;连续梁桥;影响因素;数值分析;不平整度桥面;冲击系数中图分类号:U448.21文献标志码:AAnalysisofVehicle-BridgeCouplingVibrationofContinuousGirderBridgeUnderUnevenDeckSH
3、Iling,XUANJi-ming,SONGYi-fan(1.SchoolofHighways,ChanganUniversity,Xian710064,China;2.CollegeofArchitecturalEngineering,ZhejiangUniversityofTechnology,Hangzhou310014,China)Abstract:Inthepresent”GeneralCodeforDesignofHighwayBridgesandCulverts”,thestructuralbasefrequencyisu
4、sedtocalculatetheimpactingcoefficientofbridgestructurewhilethebasefrequencyisrequiredtobepreferablycalculatedbythefiniteelementmethod.However,forthewaysofhowtomakethecalculation,therearenoclearprovisionsintheCode,theestima—tionformulaforthebasefrequencyofthecontinuousgir
5、derbridgegivenintheCodedonotmakeadifferencebetweenthestraightbridgeandcurvedbridgeandhence,thevaluesoftheimpactingcoefficientcalculatedbytheformulastillneedtObediscussed.Byusinganumericalanalysismethodforthehighwayvehicle——bridgecouplingvibrationbasedonthegeneralfiniteel
6、ementanal—-ysissoftwareANSYS,thefactorshavinginfluenceonthecouplingvibrationofthecurvedbridgeareanalyzedandthecouplingvibrationofboththestraightbridgeandcurvedbridgeisrespective—lycalculatedaftertheunevennessofthedeckistakenintoaccount.Theresultsoftheanalysisandcalculati
7、onshowthatthedynamiccoefficientsforthestraightbridgeandcurvedbridgearedifferentandareallgreaterthantheimpactingcoefficientcalculatedbytheestimationformulaforthecontinuousgirderbridgeintheCodewhentheformerareconvertedintotheimpactingcoeffi—cient.Keywords:vehicle—bridgecou
8、plingvibration;finiteelementmethod;curvedgirder;continu—OUSgirderbridge;influentialfactor;numericalanal
此文档下载收益归作者所有