【摘要】 对大跨桥梁抗震分析中地震动输入研究的一个专门问题,即非一致输入的研究进展作了系统的整理、归纳,讨论了基于密集台阵观测的地震动空间相关性建模方法和合成地震动场的相关性检验两个主要问题,指出几百米尺度上的地震动相关性是由各点的地震动来源于同一个震源和十分相近的传播途径、场地条件决定的,综合考虑震源、传播途径和场地条件合成地震动场,便于揭示、表达出地震动场的物理本质,包括相关性,高频段地震动的随机性也应该与震源模型的某些随机性和局部场地条件有关。更多还原

【Abstract】 A specific issue in seismic analysis of large span bridge,i.e.study on non-consistent ground motion input was reviewed in this paper.The building of spatial model for ground motion field based on observation of motions in dense arrays and coherence validation of the synthesized ground motion field were dealt with respectively.Points are emphasized that spatial correlation between motions with hundreds meter distance to each other comes from one same source and very similar path and site condition.A comprehensive approach taking source,path and site condition all into account to synthesize the motion field is convenient to reveal and express the physical nature of the motion field,including the correlation,and the randomness of high frequency motion should be also related with some randomness in source model and site condition.更多还原