地下爆炸波作用下基底滑移隔震大跨结构的动力响应分析
|
摘要
对由地下隧道内发生意外爆炸引起的地下爆炸波作用下基底滑移隔震大跨结构考虑土-结构相互作用(SSI)的动力响应进行了全面的分析。在SSI分析中,分别采用有限元、无穷元和杆件体系建立了地下衬砌及周围有限土区、远场无限土区以及基底滑移隔震大跨结构的计算模型;在基底滑移隔震分析中,提出用连续摩擦力模型取代传统库仑摩擦力模型,以避免跟踪啮合滑移的过渡边界并可减小计算误差。最后,通过与Lysmer透射边界法和修正阻尼透射边界法的算例结果对比分析,验证了本文方法的有效性,其数值结果揭示了地下爆炸波作用下大跨结构的基底滑移隔震效果以及不同隔震参数对隔震效果的影响,从而为城市地下隧道建设相关的理论研究和工程实践提供了重要的依据。
In this paper, the dynamic response analysis for the sliding base-isolated long-span structures, subjected to the underground explosion waves caused by accidental explosion inside underground tunnels, is performed considering soil-structure interactions. In the analysis of soil-structure interactions, a coupling calculation model of the tunnel and the finite soil around, the surrounding semi-infinite soil, and the sliding base-isolated long-span structure is established using the finite elements, the infinite elements and the frame system. In the analysis for sliding base isolation, the continuous friction model instead of the traditional Coulomb friction model is proposed in order to avoid the tracing of the transient boundary between meshing and sliding and to reduce the calculated error. Finally, the numerical simulation is carried out to investigate the effect of sliding base isolation for a long-span structure, subjected to the underground explosion waves, and the influence of different isolation parameters on its effect. This provides an important reference to either related academic research or practices in engineering for the construction of underground tunnels in cities.
In this paper, the dynamic response analysis for the sliding base-isolated long-span structures, subjected to the underground explosion waves caused by accidental explosion inside underground tunnels, is performed considering soil-structure interactions. In the analysis of soil-structure interactions, a coupling calculation model of the tunnel and the finite soil around, the surrounding semi-infinite soil, and the sliding base-isolated long-span structure is established using the finite elements, the infinite elements and the frame system. In the analysis for sliding base isolation, the continuous friction model instead of the traditional Coulomb friction model is proposed in order to avoid the tracing of the transient boundary between meshing and sliding and to reduce the calculated error. Finally, the numerical simulation is carried out to investigate the effect of sliding base isolation for a long-span structure, subjected to the underground explosion waves, and the influence of different isolation parameters on its effect. This provides an important reference to either related academic research or practices in engineering for the construction of underground tunnels in cities.
引文
[1]樊剑,唐家祥.带限位装置的摩擦隔震结构动力特性及地震反应分析[J].建筑结构学报,2001,22(1):20-25.(FAN Jian, TANG Jia-x iang. D ynam ic char-acteristics and earthquake response ana lys is of struc-tures supported on slide-lim ited friction base iso la-tion system [ J ]. J ourna l of B u ild ing S tructures,2001,22(1):20-25.( in Ch inese))
[2] BAKER W E, COX P A, W EST INE P S, et a l.E xp losion H azard s and E va lua tion (F und am enta lS tud ies in E ng ineering [M ]. Am sterdam, the N eth-erlands, E lsev ier Sc ien tific Pub lish ing Com pany,1983.
[3] NA SER M ostaghe l, TODD D av is. R epresen tationsof cou lom b friction for dynam ic ana lys is[J]. E arth-quake E ng ineering and S tructura l Dynam ics,1997,26(5):541-548.
[4] JOHN L, ROGER L K. F in ite dynam ic m ode l for in-fin ite m ed ia[J]. J ourna l of the E ng ineering M echan-ics D iv ision, ASCE,1969,859-877.
[5]沈冯强.改进的阻尼透射边界[J].合肥工业大学学报,1998,21(6):18-21.(SHEN F eng-q iang. Am od ified v iscous transm itting boundary [J]. J ourna lof H ef ei Un iversity of T echnology,1998,21(6):18-21.( in Ch inese))
[6]王勖成,邵敏.有限单元法基本原理和数值方法[M ].北京:清华大学出版社,1997.(W ANG X u-cheng, SHAO M in. F und am enta ls and N um erica lM ethod s of F in ite E lem entM ethod [M ]. B e ijing: T s-inghua U n ivers ity P ress,1997.( in Ch inese))
[7]龚晓南.土塑性力学[M ].杭州:浙江大学出版社,1990.(GONG X iao-nan. P lasticity M echan ics ofS oil [M ]. H angzhou: Zhe jiang U n ivers ity P ress,1990.( in Ch inese))
[8]赵崇斌,张楚汉,张光斗.用无穷元模拟半无限平面弹性地基[J].清华大学学报,1986,26(3):51-64.( ZHAO Chong-b in, ZHANG Chu-han, ZHANGG uang-dou. S im u lation of sem i-in fin ite p lane e lasticfoundation us ing in fin ite e lem en ts [ J]. J ourna l ofT singhua Un iversity,1986,26(3):51-64.( in Ch i-nese))
[2] BAKER W E, COX P A, W EST INE P S, et a l.E xp losion H azard s and E va lua tion (F und am enta lS tud ies in E ng ineering [M ]. Am sterdam, the N eth-erlands, E lsev ier Sc ien tific Pub lish ing Com pany,1983.
[3] NA SER M ostaghe l, TODD D av is. R epresen tationsof cou lom b friction for dynam ic ana lys is[J]. E arth-quake E ng ineering and S tructura l Dynam ics,1997,26(5):541-548.
[4] JOHN L, ROGER L K. F in ite dynam ic m ode l for in-fin ite m ed ia[J]. J ourna l of the E ng ineering M echan-ics D iv ision, ASCE,1969,859-877.
[5]沈冯强.改进的阻尼透射边界[J].合肥工业大学学报,1998,21(6):18-21.(SHEN F eng-q iang. Am od ified v iscous transm itting boundary [J]. J ourna lof H ef ei Un iversity of T echnology,1998,21(6):18-21.( in Ch inese))
[6]王勖成,邵敏.有限单元法基本原理和数值方法[M ].北京:清华大学出版社,1997.(W ANG X u-cheng, SHAO M in. F und am enta ls and N um erica lM ethod s of F in ite E lem entM ethod [M ]. B e ijing: T s-inghua U n ivers ity P ress,1997.( in Ch inese))
[7]龚晓南.土塑性力学[M ].杭州:浙江大学出版社,1990.(GONG X iao-nan. P lasticity M echan ics ofS oil [M ]. H angzhou: Zhe jiang U n ivers ity P ress,1990.( in Ch inese))
[8]赵崇斌,张楚汉,张光斗.用无穷元模拟半无限平面弹性地基[J].清华大学学报,1986,26(3):51-64.( ZHAO Chong-b in, ZHANG Chu-han, ZHANGG uang-dou. S im u lation of sem i-in fin ite p lane e lasticfoundation us ing in fin ite e lem en ts [ J]. J ourna l ofT singhua Un iversity,1986,26(3):51-64.( in Ch i-nese))