反应位移法在地下综合管廊抗震设计中的应用  

Application of Response Displacement Method in Seismic Design of Underground Utility Tunnels

作　　者：施有志 华建兵[3] 李秀芳[1] 林树枝 Shi Youzhi;Hua Jianbing;Li Xiufang;Lin Shuzhi(School of Civil Engineering and Architecture,Xiamen University of Technology,Xiamen 361021,Fujian,China;School of Naval Architecture,Ocean&Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Department of Architectural Engineering,Hefei University,Hefei 230013,China;Xiamen Construction Bureau,Xiamen 361003,Fujian,China)

机构地区：[1]厦门理工学院土木工程与建筑学院,福建厦门361021 [2]上海交通大学船舶海洋与建筑工程学院,上海200240 [3]合肥学院建筑工程系,合肥230013 [4]厦门市建设局,福建厦门361003

出　　处：《吉林大学学报（地球科学版）》2018年第6期1785-1796,共12页Journal of Jilin University：Earth Science Edition

基　　金：福建省自然科学基金项目(2016J01271);福建省住房和城乡建设厅科学技术项目(2015-K-38);厦门市科技计划项目(3502Z20183043)~~

摘　　要：为探讨反应位移法在地下综合管廊地震分析中的适用性及地基弹簧刚度选取和模拟方法,采用SAP2000结构有限元软件进行地下结构地震反应分析,研究基床系数、地层剪应力计算方法对结构地震响应的影响,并与PLAXIS软件的动力时程分析结果进行对比分析。结果表明:反应位移法在地下综合管廊的初步抗震计算中可优先选用;在地基弹簧刚度计算方法中,推荐使用日本公式法和常规静力有限元法,并尽量考虑土层分层情况,若一味作均匀等效化,可能导致土体动剪切模量偏大,土层均质等效计算的结构内力值与动力时程法的结构内力偏差达到-400%^-250%;建议采用SAP2000程序中实现仅受压行为的两节点缝单元+远端固定铰支座相结合的方法模拟法向地基弹簧,采用常规土弹簧单元模拟切向地基单元。This study is to explore the applicability of the response displacement method to the seismic analysis of underground utility tunnels as well as the determination and modeling of foundation spring stiffness.SAP2000 software for finite element structural analysis was adopted to analyze the seismic response of underground structures and probe into the influence of different calculation methods of modulus of subgrade reaction and shear stress of soil on the seismic response of structures.The results were compared with those derived from dynamic time-history analysis in PLAXIS.According to the research,the response displacement method is clearly preferable in the preliminary seismic calculation of underground utility tunnels.In the calculation of foundation spring stiffness,the Japanese empirical formula and the conventional static finite element methods are advisable;meanwhile,the layering of soil should be considered as much as possible,because the obsessive equivalent linearization may result in a larger shear modulus of soil,and the deviation of the internal force of the structure can reach-400%-250%compared with the results of the dynamic time history method.When applying foundation springs to the seismic response calculation model,it is recommended that two-node compression-only gap elements in SAP2000 be adopted to simulate normal foundation springs by combining distally fixed hinge supports,and the conventional soil spring elements be adopted to simulate tangential foundation elements.

关 键 词：地震工程 地下综合管廊 抗震分析 地震反应 反应位移法 

分 类 号：P315.9[天文地球—地震学]