【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。更多还原

【Abstract】 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.更多还原