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地下结构抗震简化分析方法发展及应用
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摘要
地下结构抗震是当今地震工程领域重要的研究方向之一。迄今,国内外学者已在地下结构抗震研究中提出了多种理论分析方法,包括解析方法、数值分析方法和简化分析方法。本文首先对目前常见的地下结构抗震简化分析方法做了系统的介绍,其中包括地震系数法、自由场变形法、柔度系数法、反应位移法、反应加速度法和Pushover分析方法。针对各简化分析方法的计算模型、关键参数、优缺点以及存在的问题进行了系统评述,在此基础上并结合日本阪神地震中大开地铁车站实际震害特点,提出了一种考虑上覆土体竖向惯性效应的惯性力一位移法。工程实例分析结果表明,本文建议的惯性力一位移法与传统的简化分析方法相比,不仅克服了传统方法不能给出中柱轴力的缺陷外,其他反应量的计算精度也与之基本相当。
Seismic analysis of underground structures has become an important research direction on earthquake engineering.Nowadays,many theoretical analysis methods including analytical methods,numerical methods and practical methods have been presented by domestic and foreign scholars.This paper introduced some common practical methods for seismic analysis of underground structures in detail,including seismic coefficient method,free-field racking deformation method,flexible coefficient method,response deformation method,response acceleration method and Pushover analysis method.A brief review of the calculation models,key parameters,advantages,disadvantages and existing problems for these mentioned methods was presented.This paper proposed a response displacement method for seismic analysis of shallow buried underground structure which consider the vertical inertia force of overlying soil,short for inertia force-displacement method.The analysis results of engineering project show that the inertia force-displacement method overcomes the defect of the classical practical methods which cannot calculate the axial force of the center column,and the other results have a similar calculation accuracy compared with the classical methods.
引文
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