基岩场地上大跨度斜拉桥地震反应计算模型比较

摘要

基于三种不同计算模型,计算了拟建在基岩场地上的大跨度斜拉桥的地震反应.通过对比三种计算模型的计算结果,讨论了不规则基岩场地上,大跨度斜拉桥地震反应的合理计算模型.计算结果表明,基岩场地的土-结构相互作用对上部桥梁地震反应计结果的影响很弱,在工程应用中可以忽略;局部场地效应对计算结果的影响较大,在工程应用中不可忽视.%By using three different computation model,the seismic response of a long-span cable-stayed bridge on a bedrock site is computed.The rationality of the three computation models is discussed.The results show that there is almost none soil-structure interaction on this rock site,but the site effect is significant.In pratice,the soil-structure interaction effect of structures on rock site can be neglected,while the local site effect is influential and cannot be neglected.