反应位移法抗震设计中地基弹簧系数取值的探讨

发布时间：2018-05-28 05:27

本文选题：抗震设计 + 地基弹簧　；参考：《地震工程学报》2016年05期

【摘要】：随着城市轨道交通工程抗震性能越来越受到关注,反应位移法作为一种简捷的抗震设计方法被大量应用于地下结构抗震设计中。地基弹簧系数的确定方法是反应位移法抗震设计中最为重要的因素之一,本文选取试验法、李英民法、MIDAS法和有限元法,结合北京典型地层,对比分析这四种方法地基弹簧系数取值对地下结构的弯矩、轴力和剪力的影响规律。结果表明:(1)在反应位移法计算中,地基弹簧系数取值对结构内力响应具有重要影响,对结构轴力和剪力的影响较大,而对于弯矩的影响相对较小;(2)地基弹簧系数获取方法优选试验法,在无地勘资料情况下,经验公式和有限元法可作为备选方法;(3)综合考虑四种不同地基弹簧系数确定方法对结构内力影响程度,为保证结构设计的安全性,可对试验法下结构内力进行系数修正,修正系数建议值为1.10。
[Abstract]:With the increasing attention to the seismic performance of urban rail transit engineering, the response displacement method as a simple seismic design method has been widely used in the seismic design of underground structures. The determination method of spring coefficient of foundation is one of the most important factors in seismic design of reactive displacement method. In this paper, the test method, Li Ying civil law and Midas method and finite element method are selected, combined with typical strata in Beijing. The influence of spring coefficient on bending moment, axial force and shear force of underground structure is analyzed. The results show that in the calculation of the reaction displacement method, the spring coefficient of the foundation has an important influence on the internal force response of the structure, and has a great influence on the axial force and the shear force of the structure. However, the influence of bending moment on the spring coefficient of foundation is relatively small. The empirical formula and the finite element method can be used as alternative methods to consider comprehensively the influence of four different methods of determining the spring coefficient on the internal force of the structure. In order to ensure the safety of the structural design, the coefficient of the internal force of the structure under the test method can be revised. The recommended value of the correction coefficient is 1.10.
【作者单位】：北京城建设计发展集团股份有限公司;北京九州一轨隔振技术有限公司;
【基金】：北京市科学技术委员会科技新星计划(xx2016008) 北京城建设计发展集团股份有限公司科技创新计划(2015-18)
【分类号】：TU93;U231

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