【摘要】 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。更多还原

【Abstract】 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.更多还原