【摘要】 合理的地震动时程选择与修改方法对于高层结构的抗震设计具有重要意义,有着广泛的工程应用。本文回顾了建筑抗震设计规范对于输入地震动时程的规定,通过对现有的地震动时程选择与修改方法进行分类和定性分析,挑选了两种与规范要求衔接较好的方法。结合具体算例对两种方法进行了定量分析,结果表明以安评设计谱作为选择指标,利用最小二乘法对选择的地震动时程进行修改,可以得到离散较小且符合规范要求的地震动时程,该成果能够在现行规范要求下为结构的抗震设计提供合理可靠的依据。同时,本文也对未来地震动时程选择与修改方法的研究和发展方向进行了展望,指出条件均值谱和非弹性反应谱将是该领域未来主要的研究方向。更多还原

【Abstract】 Reasonable ground motion selection and modification methods are important for seismic design of high-rise structures, with extensive engineering applications. In this paper, we reviewed requirement for the input ground motion time history in the Code for Seismic Design of Buildings. Then we selected two better methods that accord with code requirements by classifying and comparison of existing ground motion selection and modification methods. Finally, we conducted quantitative analysis for both methods with specific examples. Our results show that if we use seismic safety evaluation design spectrum as an alternative indicator and modifying the selection of ground motion time history by least squares method, we can get the smaller discrete ground motions meeting the code requirements. The results can provide reasonable and reliable basis for structural seismic design under the existing code requirements. By the end, we looked forward to research and development of ground motion selection and modification methods in the future, pointed out that the conditional mean spectra and inelastic response spectra will be the next major research directions in the field.更多还原