本文采用响应谱理论预报建筑物的振动响应，并通过实测进行比较，说明用响应谱评价爆破振动对建筑物的影响更全面。%This paper discusses the problem of impact dynamics in a multi-rigidbody systems，and presents the mathematical model of this kind of impact problem．In this model the impact impulses at collision points are not coupled with the increments of the velocities，and they are also suitable for computer coding．
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