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基于相干函数和我国抗震设计规范定义的反应谱模拟了空间变化地震动,计算了桥梁相邻结构在不同视波速和相干程度空间地震动激励下的相对位移反应,以此确定为避免桥梁相邻结构碰撞所必需的伸缩缝最小间距,并分析了地震动空间变化和结构振动特性对桥梁相邻结构最大相对位移反应的影响。结果表明:地震动的空间变化对桥梁相邻结构的相对位移反应有着重要影响,当桥梁相邻结构拥有相似的振动频率时,影响最大;抗震设计标准推荐的调整相邻结构基本频率相近而减小相邻结构间的相对位移,从而达到避免结构碰撞的建议,仅在地震动空间变化效应可以忽略的前提下才有效。
Based on the response spectrum defined by the coherence function and China’s seismic design code, the spatial variation of ground motion is simulated and the relative displacement response of the bridge adjacent structures under different ground motions with different apparent velocities and coherences is calculated. In order to avoid the adjacent bridge The minimum spacing of expansion joints necessary for the structure collision and the influence of the spatial variation of the ground motion and the vibration characteristics of the structure on the maximum relative displacement response of the bridge adjacent structure are analyzed. The results show that the spatial variation of ground motions has an important influence on the relative displacement response of adjacent structures. When the adjacent structures of bridges have similar vibration frequencies, the influence is the greatest. The seismic design standards recommend adjusting the basic frequencies of adjacent structures to reduce The relative displacement of small adjacent structures, so as to avoid the collision of the proposed structure, only in the premise of the spatial variation effect of earthquakes can be ignored.