土-上部结构相互作用的实用分析模型研究
|
摘要
讨论现有土–上部结构相互作用分析模型的优缺点,从工程应用的实际需要出发,建立土–上部结构相互作用的实用分析模型及分析方法:采用三维弹塑性杆系模型模拟上部结构,在基础底面放置水平、竖向及转动的弹簧和阻尼单元来模拟土与基础的接触作用,通过弹簧和阻尼参数的改变来模拟不同的场地等状况。用该种方法计算分析一个10层的独立基础钢筋混凝土框架结构,研究场地土剪切波速、上部结构刚度和地震动强度等因素对相互作用体系地震反应的影响,同时探讨各种情况下的结构地震能量反应规律。研究结果表明,对于独立基础钢筋混凝土框架结构来说,考虑相互作用后场地变软和上部结构刚度增大不一定使楼层顶层位移增大,但是软弱场地对结构起到一定的减震作用,并且增大上部结构刚度会使楼层剪力和弯矩有所增加;地震动作用下,上部结构刚度改变对能量的变化趋势影响很小,但是在不同影响因素下的结构阻尼耗能和结构变形能在体系能量的平衡中的作用都是主要的;改变地震强度时,不同的地震波对相互作用体系的能量的影响是不同的,阻尼耗能和结构变形耗能的作用会有所不同。
Relative merits and demerits of existing soil-structure interaction analysis models are discussed,and a new analytic model is presented based on practical engineering application. The three-dimensional elastoplastic bar model is used to simulate the upper-structure,and the contact between soil and base is simulated by using horizontal,vertical and rotary springs and dampers below the base,with different field categories being reproduced by changing the spring and damping parameters. Dynamic soil-structure interaction of a ten-story RC frame building is analyzed by utilizing the model established with the new method,through which effects of several factors,such as the foundation soil′s shear wave speed,the rigidity of upper-structure,and the earthquake magnitude on seismic response of the interaction system are evaluated,and then the pattern of the energy dissipation under different situations is discussed. Analytical results show that roof displacement does not certainly increase when softer site or stronger rigidity of upper-structure with soil-structure interaction being taken into account,but softer site can decrease the seismic response,and augmenting the rigidity of upper-structure may increase the shear force and the bending moment. Although the change of upper-structure′s rigidity affects little on energy′s changing trend of interaction system,damping energy and strain energy of the upper-structure are the main dissipated energy of the soil-structure interaction system under different situations. When the earthquake magnitude changes,there are some different influences on the energy dissipation of the interaction system under different earthquake waves,and the function of damping energy and strain energy may be different.
Relative merits and demerits of existing soil-structure interaction analysis models are discussed,and a new analytic model is presented based on practical engineering application. The three-dimensional elastoplastic bar model is used to simulate the upper-structure,and the contact between soil and base is simulated by using horizontal,vertical and rotary springs and dampers below the base,with different field categories being reproduced by changing the spring and damping parameters. Dynamic soil-structure interaction of a ten-story RC frame building is analyzed by utilizing the model established with the new method,through which effects of several factors,such as the foundation soil′s shear wave speed,the rigidity of upper-structure,and the earthquake magnitude on seismic response of the interaction system are evaluated,and then the pattern of the energy dissipation under different situations is discussed. Analytical results show that roof displacement does not certainly increase when softer site or stronger rigidity of upper-structure with soil-structure interaction being taken into account,but softer site can decrease the seismic response,and augmenting the rigidity of upper-structure may increase the shear force and the bending moment. Although the change of upper-structure′s rigidity affects little on energy′s changing trend of interaction system,damping energy and strain energy of the upper-structure are the main dissipated energy of the soil-structure interaction system under different situations. When the earthquake magnitude changes,there are some different influences on the energy dissipation of the interaction system under different earthquake waves,and the function of damping energy and strain energy may be different.
引文
[1]张国栋.土与结构相互作用体系动力特性研究[J].岩土力学,2004,25(增):397–400.(ZHANG Guodong.Research on dynamic character of soil-structure interaction system[J].Rock and Soil Mechanics,2004,25(Supp.):397–400.(in Chinese))
[2]北村春幸.建筑振动解析[M].裴星洙,廖红建,张立,译.西安:西安交通大学出版社,2004.(HARUYUKI K.Seismic response analysis methods for performance based design[M].Translated by PEI Xingzhu,LIAO Hongjian,ZHANG Li.Xi′an:Xi′an Jiaotong University Press,2004.(in Chinese))
[3]陈跃庆,吕西林.结构–地基相互作用体系的动力相似关系研究[J].地震工程与工程振动,2001,21(3):85–92.(CHEN Yueqing,LU Xilin.Study on dynamic similitude theory of soil-structure interactionsystem[J].Earthquake Engineering and Engineering Vibration,2001,21(3):85–92.(in Chinese))
[4]袁凡凡,栾茂田,闫澍旺.筏板–桩–土相互作用的三维弹塑性有限元分析[J].岩石力学与工程学报,2005,24(18):3332–3336.(YUAN Fanfan,LUAN Maotian,YAN Shuwang.3D elastoplastic finite element analysis of bearing capacity behaviour of interaction of raft-pile and soil[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(18):3332–3336.(in Chinese))
[5]周友,徐礼化,龚建伍.高层建筑物–桩筏基础–地基相互作用体系的计算分析[J].建筑技术开发,2003,30(8):32–39.(ZHOU You,XU Lihua,GONG Jianwu.Computer analysis of high building-pile foundation-soil system by ANSYS program[J].Building Technique Development,2003,30(8):32–39.(in Chinese))
[6]李培振,吕西林,陈波,等.均匀土–箱基–结构相互作用体系的计算分析[J].地震工程与工程振动,2002,22(5):115–121.(LI Peizhen,LU Xilin,CHEN Bo,et al.Computer analysis of soil-box foundation-structure dynamic interaction by ANSYS program[J].Earthquake Engineering and Engineering Vibration,2002,22(5):115–121.(in Chinese))
[7]李玉杯,熊峰.高层建筑上部结构、基础与地基土共同作用的地震时程分析[J].四川建筑科学研究,2005,31(2):98–106.(LI Yubei,XIONG Feng.Time-history analysis for interaction of upper-superstructure foundation and soil under earthquake[J].Building Science Research of Sichuan,2005,31(2):98–106.(in Chinese))
[8]叶献国,周锡元,姜欣.能量原理在结构抗震性能设计中的运用[C]//项海帆,王光远,谢礼立,等.大型复杂结构体系的关键科学问题及设计理论研究论文集.上海:同济大学出版社,2001:364–372.(YE Xianguo,ZHOU Xiyuan,JIANG Xin.Application of energy principle in performance-based design of structures[C]//XIANG Haifan,WANG Guangyuan,XIE Lili,et al ed.Disquisition of Some Problem of Large Complex Frame System and Design Theory Study.Shanghai:Tongji University Press,2001:364–372.(in Chinese))
[9]李培振,吕西林.考虑土–结构相互作用的高层建筑抗震分析[J].地震工程与工程震动,2004,24(3):130–138.(LI Peizhen,LU Xilin.Numerical analysis of tall buildings considering dynamic soil-structure interaction[J].Earthquake Engineering and Engineering Vibration,2004,24(3):130–138.(in Chinese))
[10]吕西林,陈跃庆.高层建筑结构——地基动力相互作用效果的震动台试验对比研究[J].地震工程与工程震动,2002,22(2):42–48.(LU Xilin,CHEN Yueqing.Study on effect of soil-structure interaction by shaking table test[J].Earthquake Engineering and Engineering Vibration,2002,22(2):42–48.(in Chinese))
[2]北村春幸.建筑振动解析[M].裴星洙,廖红建,张立,译.西安:西安交通大学出版社,2004.(HARUYUKI K.Seismic response analysis methods for performance based design[M].Translated by PEI Xingzhu,LIAO Hongjian,ZHANG Li.Xi′an:Xi′an Jiaotong University Press,2004.(in Chinese))
[3]陈跃庆,吕西林.结构–地基相互作用体系的动力相似关系研究[J].地震工程与工程振动,2001,21(3):85–92.(CHEN Yueqing,LU Xilin.Study on dynamic similitude theory of soil-structure interactionsystem[J].Earthquake Engineering and Engineering Vibration,2001,21(3):85–92.(in Chinese))
[4]袁凡凡,栾茂田,闫澍旺.筏板–桩–土相互作用的三维弹塑性有限元分析[J].岩石力学与工程学报,2005,24(18):3332–3336.(YUAN Fanfan,LUAN Maotian,YAN Shuwang.3D elastoplastic finite element analysis of bearing capacity behaviour of interaction of raft-pile and soil[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(18):3332–3336.(in Chinese))
[5]周友,徐礼化,龚建伍.高层建筑物–桩筏基础–地基相互作用体系的计算分析[J].建筑技术开发,2003,30(8):32–39.(ZHOU You,XU Lihua,GONG Jianwu.Computer analysis of high building-pile foundation-soil system by ANSYS program[J].Building Technique Development,2003,30(8):32–39.(in Chinese))
[6]李培振,吕西林,陈波,等.均匀土–箱基–结构相互作用体系的计算分析[J].地震工程与工程振动,2002,22(5):115–121.(LI Peizhen,LU Xilin,CHEN Bo,et al.Computer analysis of soil-box foundation-structure dynamic interaction by ANSYS program[J].Earthquake Engineering and Engineering Vibration,2002,22(5):115–121.(in Chinese))
[7]李玉杯,熊峰.高层建筑上部结构、基础与地基土共同作用的地震时程分析[J].四川建筑科学研究,2005,31(2):98–106.(LI Yubei,XIONG Feng.Time-history analysis for interaction of upper-superstructure foundation and soil under earthquake[J].Building Science Research of Sichuan,2005,31(2):98–106.(in Chinese))
[8]叶献国,周锡元,姜欣.能量原理在结构抗震性能设计中的运用[C]//项海帆,王光远,谢礼立,等.大型复杂结构体系的关键科学问题及设计理论研究论文集.上海:同济大学出版社,2001:364–372.(YE Xianguo,ZHOU Xiyuan,JIANG Xin.Application of energy principle in performance-based design of structures[C]//XIANG Haifan,WANG Guangyuan,XIE Lili,et al ed.Disquisition of Some Problem of Large Complex Frame System and Design Theory Study.Shanghai:Tongji University Press,2001:364–372.(in Chinese))
[9]李培振,吕西林.考虑土–结构相互作用的高层建筑抗震分析[J].地震工程与工程震动,2004,24(3):130–138.(LI Peizhen,LU Xilin.Numerical analysis of tall buildings considering dynamic soil-structure interaction[J].Earthquake Engineering and Engineering Vibration,2004,24(3):130–138.(in Chinese))
[10]吕西林,陈跃庆.高层建筑结构——地基动力相互作用效果的震动台试验对比研究[J].地震工程与工程震动,2002,22(2):42–48.(LU Xilin,CHEN Yueqing.Study on effect of soil-structure interaction by shaking table test[J].Earthquake Engineering and Engineering Vibration,2002,22(2):42–48.(in Chinese))
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心