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1、維普資訊http://www.cqvip.com第28卷第3期鐵道學報Vo1.28No.32006年6月JOURNAIOFTHECHINARAILWAYSOCIETYJune2006文章編號:10018360(2006)03—0128—05鐵路簡支梁橋減隔震支座設計參數(shù)的優(yōu)化研究楊風利,鐘鐵毅,夏禾(北京交通大學土木與建筑工程學院,E京100044)摘要:運用結構最優(yōu)化理論建立了考慮地震時車輛運行安全性的鐵路簡支梁橋減隔震體系優(yōu)化設計模型,采用ANSYS中的一階優(yōu)化方法,在優(yōu)化過程中考慮結構Rayleigh阻尼系數(shù)的變化對減隔震體系的影響及土和基礎的相互作用,實現(xiàn)
2、了對鉛芯橡膠支座動力設計參數(shù)的優(yōu)化設計。通過計算分析,得出了鉛芯橡膠支座動力參數(shù)對橋梁地震響應的影響規(guī)律:在應用LRB對不同場地條件下的鐵路簡支梁橋進行減隔震設計時,屈服后剛度與屈服前剛度比對結構地震響應有重要影響。因此,可以采用改變屈服后剛度與屈服前剛度比的簡化設計方法,滿足橋梁地震響應的要求。為了提高系統(tǒng)的優(yōu)化效率,在進行減隔震支座優(yōu)化時,行車安全性的約束可以在優(yōu)化過程外考慮,即在支座參數(shù)優(yōu)化解確定后,再進行車輛地震輸入譜密度強度sI值的驗算。關鍵詞:簡支梁橋;鉛芯橡膠支座;優(yōu)化設計;土基礎相瓦作用;行車安全性中圖分類號:U428.55文獻標識碼:AStudy
3、onOptimizationoftheDesignParameterofSeismicAbsorptionandisolationbearingforRailwaySimpleSupportedBeamBridgesYANGFeng—li,ZHONGTieyi,XIAHe(SchoolofCivilEngineeringandArchitecture,BeijingJiaotongUniversity,Beijing100044,China)Abstract:Inthispaper,theoptimaldesignmodeloftheseismicabsorpti
4、onandisolationsystemforrailwaysim-piesupportedbeambridgesconsideringtherunningsafetyofvehiclesisestablished.Thefirstorderoptimiza—tionmethodinANSYSisusedtorealizethedynamicparametersoptimaldesignoftheleadcorerubberbearing,andthevariationinfluenceofthestructuralRayleighdampingcoefficie
5、ntsontheabsorptionandisolationsys—ternandtheinteractionbetweensoilandfoundationareconsideredintheoptimizationprocess.Throughealcu—lationanalysis,theinfluencerulesofdynamicparametersofthelead—rubberbearingonbridgeseismicresponsesaregiven:theratioofthestiffnessafteryieldingtothestiffnes
6、sbeforeyielding口hasimportanteffectonthestructuralseismicresponsesintheseismicisolationdesignbyLRBforsimplesupportedbeambridgeslocatedindifferentsites.Therefore,therequirementsforseismicresponsesofbridgescanbesatisfiedbythesimplifiedmethodofchangingtheavalues.Inordertoenhancetheoptimiz
7、ingefficiency,therunningsafetycanbecon—sideredoutoftheoptimizingprocess.Thatistosay,thevaluesofspectralintensitySIfortheseismicinputtOtherunningvehiclescanbecheckedaftertheoptimalLRBparametersaredetermined.Keywords:simplesupportedbeambridge;leadcorerubberbearing;optimaldesign;soil—fou
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