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运用SAP2000软件从5个方面探讨了三维框架结构顶点位移对地震烈度、场地条件、侧向力加载模式、结构重量和材料性能等不确定性因素的敏感性程度。然后建立了一个7层的三维框架模型,详细地分析了各类场地条件下的确定性Pushover分析顶点位移和Pushover实际需求谱分析顶点位移。根据统计分析原理对顶点位移的概率分布进行了研究,从而得到确定性Pushover分析方法的保证率和适用性。结果表明:顶点位移对需求曲线的敏感性远强于能力曲线;若地震作用下结构的变形进入弹塑性状态,则确定性Pushover分析结果保证率较高,在这样的情况下,Pushover分析方法是一种可靠的抗震性能评估方法;若结构变形在地震作用下始终处于弹性状态,则Pushover分析方法不适用。
Using the software SAP2000, the sensitivity of the three-dimensional frame structure apex displacement to the seismic intensity, site conditions, lateral force loading mode, structural weight and material properties were discussed from five aspects. Then, a seven-layer three-dimensional framework model is established, and the deterministic Pushover analysis vertex displacement and pushover actual demand spectrum analysis of vertex displacements under various site conditions are analyzed in detail. According to the principle of statistical analysis, the probability distribution of vertex displacement is studied, and the guaranteed rate and applicability of deterministic Pushover method are obtained. The results show that the sensitivity of the peak displacement to the demand curve is much stronger than that of the capacity curve. If the deformation of the structure under the earthquake enters the elasto-plastic state, the guaranteed rate of the deterministic Pushover analysis is higher. In this case, Pushover analysis method is A Reliable Method for Evaluating Seismic Performance; Pushover Analysis Does Not Apply if Structural Deformations Are Always Elastic Under Earthquake.