地震作用下相邻结构的防震缝宽度确定方法

目前中国现行抗震设计规范中所规定的防震缝宽度取值一般较小,且缺乏理论依据,不能有效防止地震作用下相邻建筑之间发生碰撞,为此对相邻结构在地震作用下的最大相对位移进行研究。分别讨论周期比、高度比等因素的影响作用,在此基础上给出两单自由度体系最大相对位移的计算方法,并进而确定相邻结构的防震缝宽度。结果表明:任意高度比的相邻单自由度体系最大相对位移可由高度比为1和0两种情况求得;所提出的防震缝宽度确定方法的计算结果与时程分析结果较为接近,说明所提方法较为准确,可以用于相邻结构防震缝宽度的设计。

Method for determining seismic gaps width of adacent structures subjected to earthquakes

Because the width of seismic gaps demanded in the existing seismic design code in China is generally small and lacks theoretical supports,the pounding between adjacent buildings during ground motions may not be avoided completely.The maximum relative displacement between adjacent structures during earthquakes was studied.The effects of period ratio,height ratio were discussed.The maximum relative displacement for any height ratio can be calculated from the two cases that height ratio equals 1 and 0.Based on the conclusion,the method on calculating the maximum relative displacement of adjacent single degree of freedom(SDOF) systems was proposed,and the width of seismic gaps can be also designed.The results by the method are close with those of time history analysis.This indicates that the method is accurate and can be used in the design of the seismic gaps between adjacent buildings.