高烈度山区复杂场地环境地震响应研究
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摘要
通过对艰险山区5类典型场地环境建立三维模型,采用ALGOR分析软件、Midas/FEA分析模块,对其进行地震作用下的时程分析,得到了山区5类典型场地环境地表位移、地震加速度以及频谱分布的地震响应。总结典型场地环境地震响应特点,提出如下有关设计建议:在选择桥位时尽量避开盆状沉积软弱土层和凹凸坡面场地环境;在峡谷上进行大跨度桥梁设计时,应提高大跨度桥梁的抗震设防水平,同时控制桥梁的基本频率,消除与坡面地震共振现象;重视倾斜岩面上覆土层、山前孤突山包、凹凸坡面场地环境中不同位置的地震加速度响应的差异。
In this paper,by establishing three-dimensional models base on five typical types of site environments in precipitous mountain area,and after carrying out time-history analysis under the action of earthquake by means of ALGOR software and Midas/FEA module,the seismic responses of five typical types of site environments in mountain area were acquired,including the displacements of earth surface,seismic accelerations and the distributions of frequency spectrum.Afterwards,by summarizing the characteristics of seismic responses,the authors proposed relevant design advices as below: firstly,the site of a bridge should not be located at basin-shaped sedimentary soft strata or at concave-convex hillside;and then when a long span bridge need to be built above a canyon,the seismic resistance level should be raised,and the fundamental frequency should be controlled so that the resonance effect between bridge and earth in seismic response can be avoided;finally,the seismic acceleration response differences in different positions of different site environments including the overburden layer on steep rock surface,the solitary mound in front of mountain and the concave-convex slope surface,should be taken seriously.
In this paper,by establishing three-dimensional models base on five typical types of site environments in precipitous mountain area,and after carrying out time-history analysis under the action of earthquake by means of ALGOR software and Midas/FEA module,the seismic responses of five typical types of site environments in mountain area were acquired,including the displacements of earth surface,seismic accelerations and the distributions of frequency spectrum.Afterwards,by summarizing the characteristics of seismic responses,the authors proposed relevant design advices as below: firstly,the site of a bridge should not be located at basin-shaped sedimentary soft strata or at concave-convex hillside;and then when a long span bridge need to be built above a canyon,the seismic resistance level should be raised,and the fundamental frequency should be controlled so that the resonance effect between bridge and earth in seismic response can be avoided;finally,the seismic acceleration response differences in different positions of different site environments including the overburden layer on steep rock surface,the solitary mound in front of mountain and the concave-convex slope surface,should be taken seriously.
引文
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[3]唐荣昌,韩渭宾.四川活动断裂与地震[M].北京:地震出版社,1993.
[4]中铁二院工程集团有限责任公司.汶川地震工程震害调查及铁路工程抗震设计标准研究——2008年5月12日四川汶川8.0级地震震害特征及其对铁路交通的影响[R].成都:中铁二院工程集团有限责任公司,2008.
[5]刘恢先.唐山大地震震害[M].北京:地震出版社,1986.
[6]朱颖,魏永幸.高烈度地震山区铁路综合选线及总体设计研究—汶川大地震工程震害调查分析与研究[M].北京:科学出版社,2009.
[7]中华人民共和国建设部.GB50111—2006铁路工程抗震设计规范[S].北京:中国计划出版社,2006.
[8]马宏旺,吕西林.建筑结构基于性能抗震设计思想的几个问题[J].同济大学学报,2002,30(12):1432-1433.
[9]中华人民共和国交通部.JTG/T B02—01—2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
[10]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[11]李国豪.桥梁结构稳定与振动[M].北京:中国铁道出版社,1996.
[12]中华人民共和国交通部.GB17741—2005工程场地地震安全性评价[S].北京:中国标准出版社,2008.
[13]俞载道.结构动力学基础[M].上海:同济大学出版社,1987.
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