X形弹塑性钢挡块对简支梁桥横向地震反应影响
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摘要
为研究X形弹塑性钢挡块对桥墩横向地震响应影响,以简支梁桥为背景建立有限元模型。采用非线性时程方法分析弹塑性钢挡块屈服强度、桥墩高度、板式橡胶支座临界滑动力对桥墩地震响应影响。研究表明:与横桥向不采用任何约束相比,弹塑性钢挡块可有效减小墩梁间相对位移;与横桥向采用刚度及强度较大混凝土挡块相比,弹塑性钢挡块可有效减小桥墩剪力及弯矩。桥墩地震反应受弹塑性挡块屈服强度、墩高及板式橡胶支座临界滑动力影响较大。
To investigate the effect of X-shaped elastic-plastic steel shear keys on transverse seismic responses of pier,the nonlinear finite element model of a simply-supported girder bridge was built. Effects of elastic-plastic steel shear key yield strength,pier height,and laminated rubber bearing critical sliding force were analyzed with nonlinear time history method. The results show that in comparison with the case without transverse constraints,elastic-plastic steel shear keys are effective in reducing the relative displacement between pier and girder. Compared to the case with stiff and strong concrete shear keys,elastic-plastic steel shear keys can diminish the shear forces and bending moments of the pier.Seismic responses of pier are heavily influenced by the elastic-plastic steel shear key yield strength,pier height and the critical sliding force of the laminated rubber bearing.
To investigate the effect of X-shaped elastic-plastic steel shear keys on transverse seismic responses of pier,the nonlinear finite element model of a simply-supported girder bridge was built. Effects of elastic-plastic steel shear key yield strength,pier height,and laminated rubber bearing critical sliding force were analyzed with nonlinear time history method. The results show that in comparison with the case without transverse constraints,elastic-plastic steel shear keys are effective in reducing the relative displacement between pier and girder. Compared to the case with stiff and strong concrete shear keys,elastic-plastic steel shear keys can diminish the shear forces and bending moments of the pier.Seismic responses of pier are heavily influenced by the elastic-plastic steel shear key yield strength,pier height and the critical sliding force of the laminated rubber bearing.
引文
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[3]李永红.城市高架桥限位装置抗震设计研究[D].兰州:兰州交通大学,2012.
[4]方圆.汶川地震典型简支梁桥震害分析及横向限位装置研究[D].上海:同济大学,2012.
[5]范立础,李建中.汶川桥梁震害分析与抗震设计对策[J].公路,2009,5:122-128.FAN Li-chu,LI Jian-zhong.Analysis of bridge damage in wenchuan earthquake and design strategies[J].Highway,2009,5:122-128.
[6]叶爱君,管仲国.桥梁抗震(第二版)[M].北京:人民交通出版社,2011.
[7]庄卫林,刘振宇,蒋劲松.汶川大地震公路桥梁震害分析及对策[J].岩石力学与工程学报,2009,28(7):1377-1387.ZHUANG Wei-lin,LIU Zhen-yu,JIANG Jin-song.Earthquakeinduced damage analysis of highway bridges in Wenchuan earthquake and countermeasures[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(7):1377-1387.
[8]刘荣灿,王克成,唐红梅,等.桥梁抗震设计中滑移挡块作用机理[J].重庆交通大学学报,2012,4:171-173.LIU Rong-can,WANG Ke-cheng,TANG Hong-mei,et al.Mechanism of sliding block in bridge seismic designing[J].Journal of Chongqing Jiaotong University(Natural Sciences),2012,4:171-173.
[9]Li Jian-zhong,Xu Yan,A new isolation system for small and mid-span highway bridge[C].Proceedings of the 7th US National Seismic Conference on Bridges and Highways(7NSC),Oakland,California,U.S,2013.
[10]黄小国.连续梁桥防落梁装置试验和理论研究[D].上海:同济大学,2009.
[11]石岩,王军文,李建中,等.横桥向地震作用下简支梁桥偏心碰撞反应参数研究[J].振动与冲击,2012,31(18):132-136.SHI Yan,WANG Jun-wen,LI Jian-zhong,et al.Effects of parameters on seismic eccentric pounding responses of a simply-supposed girder bridge under transverse earthquake[J].Journal of Vibration and Shock,2012,31(18):132-136.
[12]Lotfollahi M,Mofid M.Innovative method in seismic design of slab-on-girder steel bridges[J].Journal of Constructional Steel Research,2008,64(12):1420-1435.
[13]Khazaei M.Investigation on dynamics nonlinear analysis of steel frames with steel dampers[J].Procedia Engineering,2013,54:401-412.
[14]Maleki S.Effect of side retainers on seismic response of bridges with elastomeric bearings[J].Journal of Bridge Engineering,2004,9(1):95-100.
[15]Tena-Colunga A.Mathematical modelling of the ADAS energy dissipation device[J].Engineering Structures,1997,19(10):811-821.
[16]JTG/T B02-01-2008,公路桥梁抗震设计细则[S].
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