【摘要】 采用波动法对季节性冻土区和多年冻土区的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,不同基础类型桥墩受冻土的影响规律基本相同,墩高在10m~22m之间时冻土层对桥墩地震反应的影响最为显著。桥墩的地震反应在冬夏两季具有显著区别,抗震设计中应考虑不同季节的影响。更多还原

【Abstract】 Wave motion method is used to calculate the seismic response of bridges in seasonal frozen or permafrost regions. The effect of frozen soil layer on the seismic response of bridges is studied. The seismic force distribution on bridge piers is obtained for various conditions of frozen soil thickness and height of bridge piers. The calculation results indicate that the frozen soil layer has remarkable effect on the seismic response of bridges. The influential law of frozen soils on the bridge pier with different kinds of foundations is similar. The effect of frozen soils on the seismic response of bridge piers is prominent with the height of the bridge pier ranging from 10 to 22 meters. The seismic response of bridge piers in winter and summer seasons has remarkable distinction. The seasonal effect should be considered in the seismic design of bridges.更多还原