铰链式护坡及其地震反应特性分析
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摘要
考虑土与结构动力相互作用的影响,建立了铰链式护坡的非线性动力相互作用的有限元分析模型,对其进行了地震反应数值模拟,分析了在不同地震动作用下的应力、加速度和相对水平位移反应特性,结果表明:在相同强度和频谱的地震动作用下,护坡中上部和底部的最大动应力幅值较大,护坡顶部和底部的加速度和水平位移较大;在相同强度和不同频谱的地震动作用下,在Loma Prieta波作用下护坡的动力反应比Kobe波作用下护坡的动力反应大。从护坡的地震反应特性考虑,护坡顶部和底部是地震动作用下的薄弱区域,在抗震设计中应引起重视。另外,对于护坡的中上部也应引起相应的重视。
Considering dynamic interaction effects of soil and structure,nonlinear dynamic interaction finite element model of the hinge type slope is established.Then,seismic response of the numerical simulation model has been carried on.The action of stress under different ground motion is analyzed.At the same time, acceleration and relative horizontal displacement response characteristics are analyzed.The results show that at the same intensity and spectrum of ground motion,the place of the maximum dynamic stress is the upper middle and the upper part of slope,and the place of the maximum acceleration and horizontal displacement of large is top and bottom of slope.At the same intensity and the different spectrum of ground motion,the dynamic response of slope under Loma Prieta wave is larger than that under Kobe Wave.Considering the seismic response characteristics of slope,slope top and bottom are weak area under ground motion.So that, it should be paid attention to these places in seismic design.In addition,the middle and upper of slope should also be taken attention seriously.
Considering dynamic interaction effects of soil and structure,nonlinear dynamic interaction finite element model of the hinge type slope is established.Then,seismic response of the numerical simulation model has been carried on.The action of stress under different ground motion is analyzed.At the same time, acceleration and relative horizontal displacement response characteristics are analyzed.The results show that at the same intensity and spectrum of ground motion,the place of the maximum dynamic stress is the upper middle and the upper part of slope,and the place of the maximum acceleration and horizontal displacement of large is top and bottom of slope.At the same intensity and the different spectrum of ground motion,the dynamic response of slope under Loma Prieta wave is larger than that under Kobe Wave.Considering the seismic response characteristics of slope,slope top and bottom are weak area under ground motion.So that, it should be paid attention to these places in seismic design.In addition,the middle and upper of slope should also be taken attention seriously.
引文
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[5]Chen Guoxing,Liu Xuezhu,Zhu Dinghua.A study on dynamic shear modulus ratio and damping ratio of recently deposited soils for southern region of Jiangsu province along Yangtze river,China.Proc.4th International Conference on Soft Soil Engineering,Vancouver,Canada,October 4-6,2006
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[2]Simons D B,Senturk F Y.Sediment Transport Technology.[M]Water Resources Publications,1976
[3]Klein BretelerM,Bezuijen A.Simplified design method for block revetments[A].Proceedings ICE Conference on Coastal Structures and Breakwaters[C].London:Thomas Telford,1991,423-436
[4]庄海洋,陈国兴.基于Davidenkov骨架曲线的动力粘弹性模型[J].岩土力学,2007.3:436-442Zhuang Hai-yang,Chen Guo-xing.A dynamic visco-elastic model based on Davidenkov skeleton curve[J].Rock and Soil Mechanics,2007.3:(436-442)
[5]Chen Guoxing,Liu Xuezhu,Zhu Dinghua.A study on dynamic shear modulus ratio and damping ratio of recently deposited soils for southern region of Jiangsu province along Yangtze river,China.Proc.4th International Conference on Soft Soil Engineering,Vancouver,Canada,October 4-6,2006
[6]Jeeho Lee,Gregory L.Fenves.Plastic-damage model for cyclic loading of concrete structures.Journal of engineering mechanics,1998(4):892-900
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