摘要
风致板状飞掷物是风灾中造成建筑围护结构破坏的主要因素之一,且常因材质不均匀等因素导致质量偏心。建立考虑质量偏心的板状飞掷物运动数值模型,研究了不同质心位置和初始风攻角影响下飞掷物的飞行姿态、轨迹和速度,分析了飞掷物存在质量偏心时对人群和建筑的影响。研究表明:数值模型准确高效,可应用于大量不同初始参数飞掷物的快速模拟;质量偏心会加剧板状飞掷物在运动中的反向翻转,转动会耗散平动的能量从而降低冲击的速度;起飞时质心偏下飞掷物一般下坠得更快,质心偏上则更容易导致轨迹发散,且质量偏心对飞掷物冲击建筑围护结构的姿态较为关键。
Windborne plate-type debris is one of the main factors causing damage to the building envelope in wind disasters,and there are usually mass eccentricities due to factors such as uneven materials.A numerical motion model of plate-type debris considering mass eccentricity was established,and the flight attitudes,trajectories,and velocities of the debris under the influence of different centroid positions and initial wind attack angles were studied,and the influence of debris with eccentric mass on the crowds and buildings was analyzed.The results show that the model is accurate and efficient,and can be adapted to the rapid simulation of plenty of debris with different initial parameters;mass eccentricity exacerbates the reverse flip of the plate-type debris in motion,and the rotation dissipates the translational energy thereby reducing the velocity of the impact;during takeoff,the center of mass is biased down,and the debris generally falls faster,while a higher center of mass is more likely to cause the trajectory to be dispersed;moreover,the mass eccentricity is critical to the attitude of the debris impacting the building envelope.
作者
黄鹏
周华亮
黎子昱
林华坛
HUANG Peng;ZHOU Hualiang;LI Ziyu;LIN Huatan(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2024年第20期26-34,共9页
Journal of Vibration and Shock
基金
国家自然科学基金(52178500)。
关键词
板状飞掷物
质量偏心
飞行姿态
飞行轨迹
数值方法
plate-type debris
mass eccentricity
flight attitude
flight paths
numerical methods
