考虑结构-地基相互作用CFST拱桥地震反应分析
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摘要
为研究结构-地基相互作用对上承式大跨度钢管混凝土拱桥地震反应的影响,以黏弹性人工边界模拟半无限介质的辐射阻尼及远场地球介质的弹性恢复性能.用大型计算软件ANSYS为计算平台,以跨径为430 m的上承式钢管混凝土拱桥为工程背景,分析了多种地基情况对上部结构地震反应的影响.结果表明,考虑结构-地基相互作用后与拱脚固结情况相比拱桥固有频率、地震应力值降低,地震位移反应有所增加;该桥各关键截面的地震应力变化不大,钢管应力下降最大不超过1%,混凝土应力下降最大不超过3.5%;基岩材料变化对结构地震反应的影响大于混凝土桥基材料的变化对结构地震反应的影响;在地震响应下,最危险截面下弦杆是拱脚截面,上弦杆是离拱脚3/8跨径处截面,桥面系是跨中截面.
A viscoelastic artificial boundary was constructed to simulate radiation damping in a semi-infinite medium and the elasticity recovery capacity of the medium at the far field.The seismic response of a deck-type concrete-filled steel tube(CFST)arch bridge having a 430 m span was analyzed using the program ANSYS.Several forms of foundation were incorporated into the model.The results show that the natural frequency and the seismic response stress both decrease and seismic displacements become larger when considering the structure-foundation interaction.The seismic stresses in key cross sections change little,the stresses in the steel tube decrease less than 1% and the stresses in the concrete decrease 3.5%.The influence of rock to bridge's seismic response is greater than that of the concrete foundation itself.The dangerous cross-section of the lower chord is at the skewback,that of the top chord is at the point 3/8 distant from the skewback and that of the deck is at the span center.
A viscoelastic artificial boundary was constructed to simulate radiation damping in a semi-infinite medium and the elasticity recovery capacity of the medium at the far field.The seismic response of a deck-type concrete-filled steel tube(CFST)arch bridge having a 430 m span was analyzed using the program ANSYS.Several forms of foundation were incorporated into the model.The results show that the natural frequency and the seismic response stress both decrease and seismic displacements become larger when considering the structure-foundation interaction.The seismic stresses in key cross sections change little,the stresses in the steel tube decrease less than 1% and the stresses in the concrete decrease 3.5%.The influence of rock to bridge's seismic response is greater than that of the concrete foundation itself.The dangerous cross-section of the lower chord is at the skewback,that of the top chord is at the point 3/8 distant from the skewback and that of the deck is at the span center.
引文
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[4]苏虹,胡世德.钢管混凝土拱桥的地震响应分析方法[J].同济大学学报,2003,31(4):404-407.SU Hong,HU Shi-de.Methods of seismic responseanalysis of concrete-filled-tube arch bridges[J].Journal of Tongji University,2003,31(4):404-407.
[5]GE Xin-hui,YU Guang-yun.Influence of under-ground mining on ground surface and railway bridgeunder thick alluvium[J].Journal of China Univer-sity of Mining&Technology,2006,16(1):97-100.
[6]TAN Zhi-xiang,DENG Ka-zhong.Protection meas-ures for buildings based on coordinating action theoryof ground,foundation and structure[J].Journal ofChina University of Mining&Technology,2006,16(1):17-21.
[7]杜健民,袁迎曙,向伟.框架柱托换体系抗冲剪承载力预计模型研究[J].中国矿业大学学报,2007,36(1):60-64.DU Jian-min,YUAN Ying-shu,XIANG Wei.Pre-diction model of antipunching shear bearing capacityfor frame columns underpin system[J].Journal ofChina University of Mining&Technology,2007,36(1):60-64.
[8]LYSMER J,KULEMEYER R L.Finite dynamic mo-del for infinite media[J].Journal of Engineering Me-chanics Division(ASCE),1969,95(4):859-877.
[9]CLAYTON R,ENGQUIST B.Absorbing boundaryconditions for acoustic and elastic wave equations[J].Bulletin of the Seismological Society of America,1977,76(2):1529-1540.
[10]廖振鹏,黄孔亮,杨柏坡,等.暂态波透射边界[J].中国科学A辑,1984,26(6):50-56.LIAO Zhen-peng,HUANG Kong-liang,YANGBai-po,et al.Transient wave transmitting boundary[J].Science in China Ser A,1984,26(6):50-56.
[11]DEEKS A J,RANDOLPH M F.Axisymmetrictime-domain transmitting boundaries[J].Journal ofEngineering Mechanics,1994,120(1):25-42.
[12]刘晶波,王振宇,杜修力,等.波动问题中的三维时域黏弹性人工边界[J].工程力学,2005,22(6):46-51.LIU Jing-bo,WANG Zhen-yu,DU Xiu-li,et al.Three-dimensional visco-elastic artificial boundariesin time domain for wave motion problems[J].En-gineering Mechanics,2005,22(6):46-51.
[13]刘晶波,吕彦东.结构-地基动力相互作用问题分析的一种直接方法[J].土木工程学报,1998,31(3):55-64.LIU Jing-bo,LV Yan-dong.A direct method forana-lysis of dynamic soil-structure interaction[J].China Civil Engineering Journal,1998,31(3):55-64.
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