多年冻土区桥梁的地震反应
|
摘要
首先研究了冻土区桥梁的抗震计算方法,对波动法和惯性力法的计算结果进行了对比分析。对比结果表明惯性力法的计算结果偏大,但当基岩的剪切波速很大时,两种方法的结果接近。然后,采用波动法对季节性冻土区和多年冻土区桥梁结构进行了地震反应分析,研究了冻土层的变化对桥梁结构地震反应的影响,得到了不同冻土厚度、不同墩高时桥墩地震内力分布的规律。计算结果表明,冻土层的存在对桥梁的地震反应具有显著影响,桥墩的地震反应在冬夏两季具有显著区别。
The seismic design methods of bridges in the permafrost region are studied firstly.The wave method and the inertial force method are compared.The result of comparison indicates that the calculation result of the inertial force method is larger than the result of the wave method.The two methods can get conformable results when the shear wave velocity of the base rock is very large.Then the wave method is used to calculate the seismic response of the bridges in seasonal frozen or permafrost regions.The influence of frozen soil layer on the seismic response of the bridges is studied.The seismic force distribution of the bridges is gained under various conditions of the frozen soil thickness and the height of bridge piers.The calculated results indicate that the frozen soil layer has remarkable effect on the seismic response of the bridges,and the seismic response of the bridges in winter and summer season have remarkable distinction.
The seismic design methods of bridges in the permafrost region are studied firstly.The wave method and the inertial force method are compared.The result of comparison indicates that the calculation result of the inertial force method is larger than the result of the wave method.The two methods can get conformable results when the shear wave velocity of the base rock is very large.Then the wave method is used to calculate the seismic response of the bridges in seasonal frozen or permafrost regions.The influence of frozen soil layer on the seismic response of the bridges is studied.The seismic force distribution of the bridges is gained under various conditions of the frozen soil thickness and the height of bridge piers.The calculated results indicate that the frozen soil layer has remarkable effect on the seismic response of the bridges,and the seismic response of the bridges in winter and summer season have remarkable distinction.
引文
[1]Gao Y,Yang Y,Tan Y.Earthquake damage to brick bu ild ings and its m itigation in cold region[A].International Symposium on Cold RegionD evelopm ent[C],Vol.2.1988.
[2]郭恩栋,王东升,陆鸣,等.青新交界8.1级地震生命线工程震害[J].地震工程与工程振动,2002,22(3):77-81.
[3]徐学燕,仲丛利.冻土的动力特性研究及其参数确定[J].岩土工程学报,1998,20(5):77-81.
[4]徐学燕,徐春华,李晓稚.冻土场地地震加速度反应谱研究[J].岩土工程学报,2003,25(6):680-683.
[5]刘鸿绪,孙彦福,陈亚明,徐学燕,印艳华.季节冻土层对房屋地震破坏的影响[J].冰川冻土,1998,20(1):46-50.
[6]杨柏坡,孙平善,申杰.有冻土层场地上多层砖房的震害预测方法[J].地震工程与工程振动,1999,19(2):87-94.
[7]孙建刚,王莉莉,魏志真.季节性冻土层对立式储罐地震反应的影响[J].世界地震工程,2003,19(4):121-126.
[8]赖远明,吴紫汪,朱元林,朱林楠.寒区隧道地震响应的弹粘塑性分析[J].铁道学报,2000,22(6):84-89.
[9]VaziriH,Han Y.Fu ll-scale filed stud ies of the dynam ic response of p iles embedded in partially frozen soil[J].Canad ian Geotechn ical Jour-nal,1991,28(5):708-718.
[10]廖振鹏.工程波动导引[M].北京:科学出版社,1996.
[11]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.
[12]陆鸣,等.青藏铁路四座主要桥梁工程场地地震安全性评价报告[R].中国地震局工程地震研究中心.2001.
[2]郭恩栋,王东升,陆鸣,等.青新交界8.1级地震生命线工程震害[J].地震工程与工程振动,2002,22(3):77-81.
[3]徐学燕,仲丛利.冻土的动力特性研究及其参数确定[J].岩土工程学报,1998,20(5):77-81.
[4]徐学燕,徐春华,李晓稚.冻土场地地震加速度反应谱研究[J].岩土工程学报,2003,25(6):680-683.
[5]刘鸿绪,孙彦福,陈亚明,徐学燕,印艳华.季节冻土层对房屋地震破坏的影响[J].冰川冻土,1998,20(1):46-50.
[6]杨柏坡,孙平善,申杰.有冻土层场地上多层砖房的震害预测方法[J].地震工程与工程振动,1999,19(2):87-94.
[7]孙建刚,王莉莉,魏志真.季节性冻土层对立式储罐地震反应的影响[J].世界地震工程,2003,19(4):121-126.
[8]赖远明,吴紫汪,朱元林,朱林楠.寒区隧道地震响应的弹粘塑性分析[J].铁道学报,2000,22(6):84-89.
[9]VaziriH,Han Y.Fu ll-scale filed stud ies of the dynam ic response of p iles embedded in partially frozen soil[J].Canad ian Geotechn ical Jour-nal,1991,28(5):708-718.
[10]廖振鹏.工程波动导引[M].北京:科学出版社,1996.
[11]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.
[12]陆鸣,等.青藏铁路四座主要桥梁工程场地地震安全性评价报告[R].中国地震局工程地震研究中心.2001.
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