【摘要】 为充分考虑地震动的不确定性与随机性，弥补常规地震动无法覆盖的超烈度大震工况，预判超高层建筑结构在不同极限状态下的超越概率，以某拟建636m超高层为例，对结构进行增量动力弹塑性时程分析，结果表明:随地震动强度逐渐增加，结构墙肢损伤与SRC巨型柱损伤由顶部楼层逐渐向底部楼层发展;同时由于结构构件塑性发展顺序与损伤程度的不同，导致结构最大层间位移角存在随地震动强度逐渐增加而减小的情况;在不同组地震动或同一组地震动不同强度作用下，结构层间位移角分布规律与最大值发生位置存在一定的离散性，体现了地震动的不确定性与随机性，也表明了选择多组地震动从概率论角度进行结构抗震性能评价的必要性;结构基频下降指标与最终软化指标曲线分布规律基本相同，在相同性能水准下，不同地震动强度的计算结果表明，结构最大层间位移角作为结构的工程需求参数较为合理准确。在增量动力分析方法的基础上，结合概率理论定量地对结构进行地震易损性分析，结果表明，本案例主体结构满足“小震不坏、中震可修、大震不倒”的抗震要求，基本达到“中震不坏、大震可修、特大震不倒”的抗震性能目标。更多还原

【Abstract】 In order to fully consider the uncertainty and randomness of ground motion,make up for the super-intensity major earthquake scenarios that cannot be covered by conventional ground motion,and predict the exceedance probability of super high-rise building structures under different limit states,a proposed 636m super high-rise building was taken as an example to conduct incremental dynamic elastoplastic time-history analysis of the structure. The results show that with the gradual increase of ground motion intensity,the damage to structural wall piers and SRC mega-columns develops gradually from the top floors to the bottom floors. Meanwhile,due to the differences in the plastic development sequence and damage degree of structural components,the maximum story drift angle of the structure decreases with the gradual increase of ground motion intensity in some cases. Under the action of different groups of ground motions or different intensities of the same group of ground motions,there is a certain discreteness in the distribution law and maximum value position of the structural story drift angle,which reflects the uncertainty and randomness of ground motion and also indicates the necessity of selecting multiple groups of ground motions to evaluate the structural seismic performance from a probabilistic perspective. The distribution law of the fundamental frequency drop index of the structure is basically consistent with that of the final softening index curve. Under the same performance level,the calculation results of different ground motion intensities show that the maximum story drift angle of the structure is reasonable and accurate as the engineering demand parameter(EDP)of the structure. On the basis of the incremental dynamic analysis(IDA) method,combined with probability theory,the seismic vulnerability analysis of the structure was quantitatively carried out. The results show that the main structure of this case meets the seismic requirements of "no damage under minor earthquake,repairable under moderate earthquake,and no collapse under major earthquake",and basically achieves the seismic performance goal of "no damage under moderate earthquake,repairable under major earthquake,and no collapse under extreme earthquake".更多还原