地震工程学报2016，Vol.38Issue(5)：685-692,8.DOI:10.3969/j.issn.1000-0844.2016.05.0685
反应位移法抗震设计中地基弹簧系数取值的探讨
Discussion on the Spring Constant of Ground Foundation in the Seismic Design of Underground Structures Using the Response Displacement Method
摘要
Abstract
Urban rail engineering faces significant challenges with regard to an earthquake resistant design of underground structures.The response displacement method is a simple method,which is widely used to design such structures.Thus,determining the ground spring constant in the seismic design of underground structures is very important.Four typical determination methods are introduced:the test method,Li's method,the MIDAS method,and the finite element meth-od.Based on the values of the ground spring constant determined through these four methods and considering the local geological conditions in Beij ing,response displacement models are used to obtain the bending moment,axial force,and shear force of the underground structures.The four determination methods are compared on the basis of their respective advantages and disadvanta-ges.The results show that the values of the ground spring constant have a significant influence on the internal force response of underground structures.Moreover,using the response displacement method,we observe that the constant has a greater influence on the axial force and shear force and comparatively lesser influence on the bending moment.The test method is recommended for designers,when geological survey data are not available.The empirical formula and the finite ele-ment method can be used as alternative methods.In order to ensure design safety,the internal force of underground structures can be modified by a correction factor of 1.10,considering that the four typical determination methods have an impact on the internal force.关键词
抗震设计/地基弹簧/反应位移法/地下结构Key words
seismic design/ground spring/response displacement method/underground struc-ture分类
建筑与水利引用本文复制引用
丁德云,杨秀仁..反应位移法抗震设计中地基弹簧系数取值的探讨[J].地震工程学报,2016,38(5):685-692,8.基金项目
北京市科学技术委员会科技新星计划(xx2016008) （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) （2015-18）
