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提出一种概率地震需求分析的云图-条带法。该方法通过引入经验地震易损性分析中的数据处理方法,解决传统云图法无法处理海量非线性时程分析结果的局限。为说明该文提出方法,选取100条地震动作为输入,针对23个钢筋混凝土框架结构进行了云图法分析。基于所有结构的云图结果,采用云图-条带法建立了群体结构的概率地震需求模型,并计算得到了群体结构的地震易损性。研究表明:云图-条带法可以有效地处理海量非线性时程分析结果,建立较为合理的概率地震需求模型。在输入地震动的强度范围内,群体结构整体发生严重破坏和完全破坏的概率很低,而主要以发生轻微破坏和中等破坏为主。
A cloud-banding method for probabilistic seismic demand analysis is proposed. This method solves the limitation of the traditional cloud graph method which can not handle the mass nonlinear time-history analysis by introducing the data processing method in the empirical seismic vulnerability analysis. In order to illustrate the method proposed in this paper, 100 seismic motions were selected as input and the cloud graph analysis was performed on 23 RC frames. Based on the results of cloud images of all structures, the probabilistic seismic demand model of population structure is established by using the cloud-banding method and the vulnerability of the population structure is calculated. The results show that the cloud-banding method can effectively deal with the results of mass nonlinear time-history analysis and establish a more reasonable probabilistic seismic demand model. Within the scope of the intensity of input earthquakes, the probability of serious and complete destruction of the whole group structure is very low, while the slight damage and moderate damage mainly occur.