中文摘要：

探究在泥石流块石冲击下山地地区钢框架结构建筑物的动力响应,运用显示动力学方法对5层钢框架结构计算模型进行数值模拟,分析不同速度的冲击物作用在结构不同位置时的动力响应.结果表明：在冲击物速度不变的情况下,冲击荷载作用于结构的不同位置时,其动力响应差别较大,节点处的响应明显小于梁、柱部位,边跨节点响应要大于中间跨节点;冲击物作用于节点时结构中边跨节点的材料最先进入塑性,且最容易发生破坏,而中间跨节点处相连接的3根梁受到的等效应力最大,材料最先进入塑性;通过对比沿冲击方向梁上某些单元的等效应力,可知在冲击物作用下节点处所承受的能量比梁的要大,撞击所引起的动力反应是局部性的;柱子在冲击过程中吸收的能量最多,是结构受到冲击时最容易发生破坏的部位.

英文摘要：

Dynamic response of buildings in mountainous region with steel frame structure to the impact of lump-stones in debris flow is explored, the displaying dynamic method is employed to simulate numerically a computation model of five-layer steel frame structure, and the dynamic response of the structure to the impact of an impacting body in different positions with different impacting velocities is analyzed. The results show that when the impact velocity is constant and the impact load is applied to different positions of the structure, the dynamic response will have a larger difference, the response at beam-column joint will significantly be less than that at beam or column, and the response at side-span beam-column joint will be greater than that at middle-span beam-column joint. When the rock impact is applied to the joint, the ma- terial of the structure at the joint of side span, and middle span will enter first into plastic state, and the failure will take place most readily. When the rock impact is applied to the beam-column joint at middle span, the equivalent stress in the three connected beams will be maximum and the material of these beams will enter first into plastic state. It can be known through comparison of equivalent stress in some beam el- ements in the direction of impact during impacting that the energy accepted by the beam-column joint will be greater than that by the beam and the dynamic response caused by the impact will be of locality. The energy absorbed by column in the process of impact will be the greatest and the failure will most likely occur at the column when the structure is subjected to an impact.