共生型泥石流对建筑物结构损伤的多尺度分析

Multi-scale Analysis of Damage Caused by Symbiotic Debris Flow to Building Structure

为了获得泥石流对建筑物结构损伤情况,提高泥石流下建筑结构损伤检测精确性,针对共生型泥石流对建筑物结构损伤进行多尺度分析。结合LiDAR点云数据和航空摄像数据,提取泥石流灾害建筑物结构相关信息;分析泥石流的冲击机理和地貌形迹。结合实际观测和基础信息,计算泥石流的冲击力和建筑结构最大位移,获得共生型泥石流对建筑物结构冲击作用下的影响因素。利用简化泥石流作用力,对一个二层建筑结构在共生型泥石流冲击下的损伤位移情况进行模拟,设计四种工况,通过不同工况在泥石流下的冲击响应实现结构损伤多尺度分析。结果表明:结构柱产生位移的主要影响因素为泥石流整体作用力,一旦遇到大石块,位移会有增加趋势;建筑结构最大位移和泥石流密度、刚度等因素相关;结构最大位移模拟值与理论值拟合度高;泥石流中比较大的石块为建筑物结构受到损伤的关键因素,可利用减小结构刚度减缓冲击力。

In order to obtain the damage of debris flow to the building structure and improve the accuracy of the damage detection of the building structure under debris flow, multi-scale analysis is carried out for the damage of the building structure caused by the symbiotic debris flow.Combined with LIDAR point cloud data and aerial camera data, the information of debris flow disaster building structure and is extracted the impact mechanism and geomorphic trace of debris flow is analyzed.Combined with the actual observation and basic information, the impact force of debris flow and the maximum displacement of building structure are calculated, and the influencing factors of the impact of symbiotic debris flow on building structure are obtained.Using the simplified debris flow forces, the damage displacement of a two-story building structure under the impact of symbiotic debris flow is simulated.Four kinds of working conditions are designed, and the multi-scale analysis of structure damage is realized by the impact response of different working conditions under debris flow.The results show that the main influencing factor of the displacement of structural column is the whole force of debris flow. Once encountering large rock blocks, the displacement will increase.The maximum displacement of the building structure is related to the density and rigidity of debris flow, and the simulation value of the maximum displacement of the structure is highly consistent with the theoretical value.The larger rocks in debris flow are the key factors of building structure damage, which can be used to reduce the structural stiffness and reduce the impact force.