【摘要】 利用摩擦单元模拟了活动支座摩擦力在桥梁地震反应分析中的作用,以一座6跨连续梁桥为例,通过改变其计算参数得到不同的计算模型,对各模型进行时程反应分析,得到不同参数模型的固定墩墩底弯矩的减震率。发现在某些情况下出现了负减震率并进行了原因分析。通过不同参数模型减震率的对比,分析了各计算参数对固定墩墩底减震率的影响。建议对于考虑支座摩擦后自振周期接近场地卓越周期的桥梁考虑活动支座摩擦作用。更多还原

【Abstract】 The effects of the movable supports on the seismic analysis of a bridge are simulated by using the friction element.The time-history analysis of different calculating model of a 6-span bridge is finished.The results of the bridge are shown that the vibration decreasing ratio of bottom moment of the fixed pier can be negative under some circumstance,and its reason is described in detail.The influence of the calculating parameters of the bridge on the vibration decreasing ratio of the battom moment is analysed.The suggestion is that the effect of the friction force at the movable supports of the bridges is taken into account when the first natural period of the bridge is close to the dominant period of the site.更多还原