考虑地震动局部场地效应的大跨度斜拉桥随机地震响应分析*
武芳文1,赵 雷2

(1.长安大学 公路学院,西安 710064; 2.西南交通大学 土木工程学院,成都 610031)

桥梁工程; 随机振动; 斜拉桥; 地震动; 局部场地效应

Stochastic Seismic Response of Long-Span,Cable-Stayed Bridges under Local Site Effect
WU Fang-wen1,ZHAO Lei2

(1.School of Highway,Chang'an University,Xi'an 710064,Shaanxi,China)(2.School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,China)

bridge engineering; stochastic vibration; cable-stayed bridge; earthquake motion; local site effect

备注

基于随机振动理论,以苏通长江公路大桥为例,研究了局部场地效应对大跨度斜拉桥地震反应的影响。结果 表明:与一致激励相比,局部场地效应对结构的内力和位移影响显著; 场地效应对主梁、索塔内力和位移的影响程度及规律也不尽相同,须区别对待分析。

With the growth of the main span of the cable-stayed bridges,the spatial effect of earthquake motion for the spatial structures becomes a new research topic.Based on stochastic vibration theory and taking the example of SuTong Yangtze River Highway Bridge,the stochastic seismic response of super-long-span,cable-stayed bridge under local effect is developed.The results indicate that the internal force and displacement are influenced obviously by local site effect than by the uniform excitation.For different responses of internal force and displacement of the girder and tower,the impact and the rules are different for seismic ground motion under local effect.Therefore,in view of different cases,the analyses would have different results.