基于非弹性位移的土-结构相互作用的抗震设计方法
Inelastic Displacement-based Seismic Design Method for Soil-structure Interaction Systems
作者：吕洋(四川大学 建筑与环境学院, 深地科学与工程教育部重点实验室, 四川 成都 610065)；熊峰(四川大学 建筑与环境学院, 深地科学与工程教育部重点实验室, 四川 成都 610065)；葛琪(四川大学 建筑与环境学院, 深地科学与工程教育部重点实验室, 四川 成都 610065)
Author：LU Yang(Key Lab. of Deep Underground Sci. and Eng., for Minisity of Education, College of Architecture and Environment, Sichuan Univ., Chengdu 610065, China)；XIONG Feng(Key Lab. of Deep Underground Sci. and Eng., for Minisity of Education, College of Architecture and Environment, Sichuan Univ., Chengdu 610065, China)；GE Qi(Key Lab. of Deep Underground Sci. and Eng., for Minisity of Education, College of Architecture and Environment, Sichuan Univ., Chengdu 610065, China)
收稿日期：2018-03-07 年卷（期）页码：2018,50(3):142-148
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：基于位移的设计;土–结构相互作用;等效单自由度振子;非弹性反应谱;等效线性化;非线性时程分析
Key words：displacement-based design;soil-structure interaction;ESDOF oscillator;inelastic response spectrum;equivalent linearization;nonlinear response-history analysis
基金项目：自然科学基金资助项目（51508357）；四川省科技计划应用基础资助项目（2015JY0278）
中文摘要
基于等效线弹性系统位移的土-上部结构相互作用抗震设计方法中的不足，特别针对设计标准中关于相互作用系统等效阻尼比公式以及相关研究提供的设计步骤中存在的问题,提出了一个新的基于非弹性位移且考虑土-结构相互作用抗震设计方法。该方法将相互作用系统用一个等效单自由度理想弹塑性振子替代，并结合非弹性位移谱进行设计。给出了替代振子周期、阻尼比和延性比的公式和推导过程，以及与《建筑抗震设计规范》（GB50011-2010）中弹性位移谱相容的非弹性位移谱的建立方法和具体的设计步骤。并使用提出的公式对已有的基于弹性位移谱的设计方法进行了修正。将新方法与修正后的已有方法应用于具体的设计算例，通过非线性时程分析方法对设计结果进行验算。验算结果表明，基于非弹性方法的设计最大位移值比基于弹性方法的方案更接近时程分析结果。
英文摘要
The inadequacies of existing displacement-based design methods for seismic soil-structure interaction (SSI) systems using equivalent linearization were summarized, with emphases on issues concerning provisions-specified equivalent system damping ratio and design procedures proposed in previous research. A new design method for SSI systems based on inelastic displacement was presented. The suggested method utilized an elastic-perfectly plastic single-degree-of-freedom (SDOF) replacement oscillator to represent an actual SSI system, combined with inelastic displacement spectra. The derivations of formulae for the period of vibration, damping ratio and ductility of the replacement oscillator, the method of constructing design inelastic displacement spectra compatible with their elastic counterparts constructed using the code for seismic design of buildings (GB50011—2010), and detailed design procedures were given. Based on the proposed formulae, the existing procedures of elastic displacement-based design for SSI systems were modified. An example was provided to illustrate the design process of the new and the modified methods, and the solutions were checked using nonlinear response-history analysis. It was showed that design displacements based on the new method are closer to the response-history analysis results than those obtained using the modified method that deals with linear systems.
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