高速铁路沿线轻钢类建筑物失效运动路径数值仿真研究-《高速铁路技术》

文章信息/Info

Title:: Numerical Simulation for Failure Path of Light Steel Buildings along High-speed Railway

Author(s):: ZHANG Lijun; ZHAO Lei; SUN Xinyu; 1. Southwest Jiaotong University, Chengdu 610031, China;
2. China Railway, Beijing 100844, China

Keywords:: measured model|numerical simulation|wind load|fluid-structure interaction|wind-induced drift

摘要:: 轻钢类建筑物失效入侵高速铁路沿线事故日趋增长,已成高速铁路路外环境整治的一项主要内容,轻钢类建筑物失效运动路径亟待开展研究。本文基于TTU实测模型参数,采用Lsdyna-ICFD计算模块进行数值模拟分析,将模拟结果与实测对比,验证模拟方法的有效性;基于此方法模拟高铁沿线轻钢类建筑物门式刚架轻钢建筑的4个风向角流场及4个风速流场,结合N-S方程采用稳态方法进行求解,分析不同风速风向下建筑表面风荷载的变化规律;采用ICFD计算模块进行流固耦合分析,揭示不同风速、风向下连接失效屋面板的风致漂移规律。计算结果表明:屋盖最大风吸荷载约616.63 N,最大漂移距离约为569.65 m。

Abstract:: The accidents of light steel buildings invading high-speed railways due to failure are increasing day by day, and it has become a main content of the remediation of the external off-railway environment. The path of light steel buildings’ failure is urgently needed to be studied. In this paper, based on Texas Tech University Building Model measured model parameters, the Lsdyna-ICFD calculation module is used for numerical simulation analysis, and the simulation results are compared with the measured data to verify the effectiveness of the simulation method. Based on this method, four wind direction angle flow fields and four wind speed flow fields of light steel buildings with portal frames along the high-speed railway are simulated, the N-S equation is solved by the steady-state method, and the variation law of wind load on the building surface under different wind speeds is analyzed. The ICFD calculation module is used for fluid-structure coupling analysis, and the wind-induced drift law of the failed roof slabs connected downward with different wind speeds and winds is revealed. The calculation results show that the maximum wind suction load of the roof is about 616.63 N and the maximum drift distance is about 569.65 m.