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非线性静力(Pushover)分析方法与非线性时程分析(NL-THA)方法相比能节约大量的计算成本,且越来越广泛地用于房屋结构的抗震分析。然而,假设结构的反应由其基本模态控制使该方法存在很大的局限性,主要适用于较为规则的短周期结构。笔者将模态Pushover方法(MPA)与能力谱方法结合,使其能考虑高阶模态反应,并应用于实际的高墩桥梁结构地震需求分析。通过与传统Pushover分析方法(SPA)和NL-THA的分析结果进行对比,验证MPA方法对于高墩桥梁地震需求分析的适用性。
The nonlinear pushover analysis method can save a lot of computational cost compared with the nonlinear time history analysis (NL-THA) method and is more and more widely used in seismic analysis of building structures. However, assuming that the structure’s response is controlled by its basic modalities, this method has great limitations and is mainly applicable to the more regular short-period structures. The author combines the modal pushover method (MPA) with the power spectrum method to make it consider the high-order modal response and apply it to the actual seismic demand analysis of high-pier bridge structures. The applicability of the MPA method to the seismic demand analysis of high pier bridges is verified by comparison with the traditional pushover analysis (SPA) and NL-THA analysis.