简介：TheFederalHighwayAdministration(FHWA)sponsoredalarge,multi-yearprojectconductedbytheMultidisciplinaryCenterforEarthquakeEngineeringResearch(MCEER)titled"SeismicVulnerabilityofNewHighwayConstruction"(MCEERProject112),whichwascompletedin1998.MCEERcoordinatedtheworkofmanyresearchers,whoperformedstudiesontheseismicdesignandvulnerabilityanalysisofhighwaybridges,tunnels,andretainingstructures.Extensiveresearchwasconductedtoproviderevisionsandimprovementstocurrentdesignanddetailingapproachesandnationaldesignspecificationsforhighwaybridges.Theprogramincludedbothanalyticalandexperimentalstudies,andaddressedseismichazardexposureandgroundmotioninputfortheU.S.highwaysystem;foundationdesignandsoilbehavior;structuralimportance,analysis,andresponse;structuraldesignissuesanddetails;andstructuraldesigncriteria.

简介：为了研究P波斜入射对沉管隧道地震响应的影响,以港珠澳大桥沉管隧道为工程背景,考虑上覆海水与海床、沉管隧道之间耦合作用,采用粘弹性边界和等效力的地震荷载输入方式,利用ADINA软件建立三维有限元模型进行地震响应分析。分析入射角为0°、20°、40°、50°、60°时P波对沉管隧道环向应力峰值（正应力峰值、剪应力峰值）和位移峰值的影响,结果表明：入射角为40°时,沉管隧道应力峰值最大;入射角为0°—40°时,隧道的应力峰值逐渐增大,入射角为40°—60°时,隧道的应力峰值逐渐减小;隧道截面4个转角处及隔墙与顶板、底板的连接处为隧道剪应力峰值最大处;隧道截面左侧剪应力峰值远大于右侧;隧道顶板正应力峰值最大,顶板的正应力峰值大约为底板的2倍;隧道截面左侧位移峰值远大于隧道截面右侧。