Dynamic response of frame structure building under impact of debris flow with large stones
LIU Huan1,2,3, FAN Xiaoyi2,4, JIANG Yuanjun5, LIU Haonan2, HAN Peifeng6, TIAN Shujun6, LIU Junxin6
1.School of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu 610500, China; 2.School of Civil Engineering and Geomatics, Southwest Petroleum University, Chengdu 610500, China; 3.Housing and Urban-Rural Development Bureau of Mingshan District, Ya'an City，Ya'an 625100，China; 4.Engineering Safety Assessment and Protection Research Institute, Southwest Petroleum University, Chengdu 610500, China; 5.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Resources, Chengdu 610299, China; 6.School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China
Abstract：Based on the SPH-FEM coupled numerical method, this paper studies the dynamic response and failure mechanism of frame structure buildings under the impact of large rock debris flow from the aspects of structural failure form, impact time history, displacement and velocity of key points, and system energy. The calculation results show that the SPH-FEM coupled numerical method can well simulate the impact climbing, diffusion around flow and stable sedimentation of debris flow. Three intensity levels of debris flow are considered. In the case of low and medium intensity impact, the filling wall of the frame house is damaged and the whole structure of the house remains stable. In the case of high intensity impact, the gradual collapse of the frame building can be observed, and the failure mode of the frame column reflects the shear failure or plastic hinge failure mechanism. For the building structure, the impact damage ability of debris flow mainly comes from the impact force of the dragon head. The impact force of the dragon body decreases about 34.2% relative to the dragon head. The concentrated effect of large stones is the main reason for the local damage of the structure column. The energy of the system is mainly converted into internal energy (17.8%) and friction energy (82.8%) through kinetic energy of debris flow.
刘欢1,2,3，樊晓一2,4，姜元俊5，刘浩南2，韩培锋6，田述军6，刘俊新6. 含大石块泥石流冲击作用下框架结构房屋动力响应研究[J]. 振动与冲击, 2024, 43(1): 9-19.
LIU Huan1,2,3, FAN Xiaoyi2,4, JIANG Yuanjun5, LIU Haonan2, HAN Peifeng6, TIAN Shujun6, LIU Junxin6. Dynamic response of frame structure building under impact of debris flow with large stones. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(1): 9-19.
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