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《鐵路簡(jiǎn)支梁橋減隔震支座設(shè)計(jì)參數(shù)的優(yōu)化研究》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、維普資訊http://www.cqvip.com第28卷第3期鐵道學(xué)報(bào)Vo1．28No．32006年6月JOURNAIOFTHECHINARAILWAYSOCIETYJune2006文章編號(hào)：10018360(2006)03—0128—05鐵路簡(jiǎn)支梁橋減隔震支座設(shè)計(jì)參數(shù)的優(yōu)化研究楊風(fēng)利，鐘鐵毅，夏禾(北京交通大學(xué)土木與建筑工程學(xué)院，E京100044)摘要：運(yùn)用結(jié)構(gòu)最優(yōu)化理論建立了考慮地震時(shí)車(chē)輛運(yùn)行安全性的鐵路簡(jiǎn)支梁橋減隔震體系優(yōu)化設(shè)計(jì)模型，采用ANSYS中的一階優(yōu)化方法，在優(yōu)化過(guò)程中考慮結(jié)構(gòu)Rayleigh阻尼系數(shù)的變化對(duì)減隔震體系的影響及土和基礎(chǔ)的相互作用，實(shí)現(xiàn)
2、了對(duì)鉛芯橡膠支座動(dòng)力設(shè)計(jì)參數(shù)的優(yōu)化設(shè)計(jì)。通過(guò)計(jì)算分析，得出了鉛芯橡膠支座動(dòng)力參數(shù)對(duì)橋梁地震響應(yīng)的影響規(guī)律：在應(yīng)用LRB對(duì)不同場(chǎng)地條件下的鐵路簡(jiǎn)支梁橋進(jìn)行減隔震設(shè)計(jì)時(shí)，屈服后剛度與屈服前剛度比對(duì)結(jié)構(gòu)地震響應(yīng)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(jiǎn)化設(shè)計(jì)方法，滿足橋梁地震響應(yīng)的要求。為了提高系統(tǒng)的優(yōu)化效率，在進(jìn)行減隔震支座優(yōu)化時(shí)，行車(chē)安全性的約束可以在優(yōu)化過(guò)程外考慮，即在支座參數(shù)優(yōu)化解確定后，再進(jìn)行車(chē)輛地震輸入譜密度強(qiáng)度sI值的驗(yàn)算。關(guān)鍵詞：簡(jiǎn)支梁橋；鉛芯橡膠支座；優(yōu)化設(shè)計(jì)；土基礎(chǔ)相瓦作用；行車(chē)安全性中圖分類號(hào)：U428．55文獻(xiàn)標(biāo)識(shí)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
8、ndati
