自锚式悬索桥地震反应有限元分析
|
摘要
以某独塔自锚式悬索桥为工程背景,采用空间有限元程序ANSYS,对其进行了地震反应仿真计算。针对桥塔和桥墩为异形结构(贝壳状弧形壳体),采用8节点实体单元模拟主塔和桥墩。通过迭代计算确定结构初始平衡状态并计入初应力对结构刚度的影响,建立了全桥精细有限元模型。分别对嵌固模型、考虑桩-土相互作用和考虑承台土压力这3种模型进行了不同地震波组合下的动力时程反应分析。计算结果表明:塔根截面的应力水平最高,是结构抗震的关键部位;墩和塔出现了局部应力集中的现象,应力集中的区域在截面突变处和截面的角点处;考虑承台土压力的影响,可以有效减小桩基础的应力;精细有限元模型可以较好地反映结构在地震作用下的易损部位。
Taking a real bridge as an example,seismic response characteristic of self-anchored suspension bridge with single-tower was studied by spatial nonlinear finite element program(ANSYS).Because tower and piers were deformed shelly structure,8-node solid element was used to simulate tower and piers.The elaborate finite element model of whole bridge was established after considering that the change of structural stiffness by initial stress and the initial balance status was obtained by iterative calculation.Three models were set up,including the built-in edge model,the pile-soil interaction model and the model considering the interaction among pile-support,pile and soil.Different seismic wave superpositions were also considered in dynamic time-history analysis.The results show that stress level of the bottom of tower is highest;stress concentration appears in tower and piers;the regions occurring with stress concentration are angular point of cross-section and places with abrupt change of cross-section;the stress of pile foundation can be reduced efficiently if the interaction between pile-support and soil is considered;the vulnerable part of bridge can be judged by elaborate finite element model.3 tabs,16 figs,12 refs.
Taking a real bridge as an example,seismic response characteristic of self-anchored suspension bridge with single-tower was studied by spatial nonlinear finite element program(ANSYS).Because tower and piers were deformed shelly structure,8-node solid element was used to simulate tower and piers.The elaborate finite element model of whole bridge was established after considering that the change of structural stiffness by initial stress and the initial balance status was obtained by iterative calculation.Three models were set up,including the built-in edge model,the pile-soil interaction model and the model considering the interaction among pile-support,pile and soil.Different seismic wave superpositions were also considered in dynamic time-history analysis.The results show that stress level of the bottom of tower is highest;stress concentration appears in tower and piers;the regions occurring with stress concentration are angular point of cross-section and places with abrupt change of cross-section;the stress of pile foundation can be reduced efficiently if the interaction between pile-support and soil is considered;the vulnerable part of bridge can be judged by elaborate finite element model.3 tabs,16 figs,12 refs.
引文
[1]Ochsendorf J A,Billington D P.Self-anchored suspensionbridges[J].Journal of Bridge Engineering,1999,4(3):151-155.
[2]李建本,贾军政.自锚式悬索桥发展综述[J].城市道桥与防洪,2005,(5):50-52.LI Jian-ben,JIA Jun-zheng.A summary of self-anchored suspension bridge development[J].UrbanRoads Bridges&Flood Control,2005,(5):50-52.
[3]Cole C M,Frieder S.Influence of inelastic tower linkson cable-supported bridge response[J].Journal of BridgeEngineering,2005,10(3):272-280.
[4]Uang C M,Frieder S,Cole C M.Performance evaluationof shear links and orthotropic bridge deck panels for thenew San Francisco-Oakland bay bridge[J].EarthquakeEngineering and Structural Dynamics,2005,34:393-408.
[5]Chihiro K,Shigeki U.Analytical study on seismicperformance evaluation of long span suspensionbridge tower[J].Engineering Structures,2000,18(7):546-557.
[6]杨孟刚,胡建华,陈政清.独塔自锚式悬索桥地震响应分析[J].中南大学学报:自然科学版,2005,36(1):133-137.YANG Meng-gang,HU Jian-hua,CHEN Zheng-qing.Seismic response analysis of self-anchoredsuspension bridge with single tower[J].Journal ofCentral South University:Science and Technology,2005,36(1):133-137.
[7]张宏斌,孔宪京,张哲.自锚式悬索桥动力特性分析[J].公路交通科技,2004,21(7):66-69.ZHANG Hong-bin,KONG Xian-jing,ZHANG Zhe.Research on dynamic performance of self-anchoredsuspension bridge[J].Journal of Highway andTransportation Research and Development,2004,21(7):66-69.
[8]袁聚云,李镜培,楼晓明.基础工程设计原理[M].上海:同济大学出版社,2001.
[9]GB J111-87,铁路工程抗震设计规范[S].
[10]谭冬莲.大跨径自锚式悬索桥合理成桥状态的确定方法[J].中国公路学报,2005,18(2):51-55.TAN Dong-lian.Decision method on reasonabledesign state of self-anchored suspension bridge[J].China Journal of Highway and Transport,2005,18(2):51-55.
[11]周敉,贺拴海,袁万城.RC梁桥承载力的振动测试评估方法[J].交通运输工程学报,2006,6(3):62-67.ZHOU Mi,HE Shuan-hai,YUAN Wan-cheng.Capacity evaluation of RC girder bridge with vibrationtesting technique[J].Journal of Traffic andTransportation Engineering,2006,6(3):62-67.
[12]狄谨,武隽.自锚式悬索桥主缆线形计算方法[J].交通运输工程学报,2004,4(3):38-43.DI Jin,WU Jun.Calculation methods for cable curveof self-anchored suspension bridge[J].Journal ofTraffic and Transportation Engineering,2004,4(3):38-43.
[2]李建本,贾军政.自锚式悬索桥发展综述[J].城市道桥与防洪,2005,(5):50-52.LI Jian-ben,JIA Jun-zheng.A summary of self-anchored suspension bridge development[J].UrbanRoads Bridges&Flood Control,2005,(5):50-52.
[3]Cole C M,Frieder S.Influence of inelastic tower linkson cable-supported bridge response[J].Journal of BridgeEngineering,2005,10(3):272-280.
[4]Uang C M,Frieder S,Cole C M.Performance evaluationof shear links and orthotropic bridge deck panels for thenew San Francisco-Oakland bay bridge[J].EarthquakeEngineering and Structural Dynamics,2005,34:393-408.
[5]Chihiro K,Shigeki U.Analytical study on seismicperformance evaluation of long span suspensionbridge tower[J].Engineering Structures,2000,18(7):546-557.
[6]杨孟刚,胡建华,陈政清.独塔自锚式悬索桥地震响应分析[J].中南大学学报:自然科学版,2005,36(1):133-137.YANG Meng-gang,HU Jian-hua,CHEN Zheng-qing.Seismic response analysis of self-anchoredsuspension bridge with single tower[J].Journal ofCentral South University:Science and Technology,2005,36(1):133-137.
[7]张宏斌,孔宪京,张哲.自锚式悬索桥动力特性分析[J].公路交通科技,2004,21(7):66-69.ZHANG Hong-bin,KONG Xian-jing,ZHANG Zhe.Research on dynamic performance of self-anchoredsuspension bridge[J].Journal of Highway andTransportation Research and Development,2004,21(7):66-69.
[8]袁聚云,李镜培,楼晓明.基础工程设计原理[M].上海:同济大学出版社,2001.
[9]GB J111-87,铁路工程抗震设计规范[S].
[10]谭冬莲.大跨径自锚式悬索桥合理成桥状态的确定方法[J].中国公路学报,2005,18(2):51-55.TAN Dong-lian.Decision method on reasonabledesign state of self-anchored suspension bridge[J].China Journal of Highway and Transport,2005,18(2):51-55.
[11]周敉,贺拴海,袁万城.RC梁桥承载力的振动测试评估方法[J].交通运输工程学报,2006,6(3):62-67.ZHOU Mi,HE Shuan-hai,YUAN Wan-cheng.Capacity evaluation of RC girder bridge with vibrationtesting technique[J].Journal of Traffic andTransportation Engineering,2006,6(3):62-67.
[12]狄谨,武隽.自锚式悬索桥主缆线形计算方法[J].交通运输工程学报,2004,4(3):38-43.DI Jin,WU Jun.Calculation methods for cable curveof self-anchored suspension bridge[J].Journal ofTraffic and Transportation Engineering,2004,4(3):38-43.
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