竹质框架模型受侧向冲击测试及分析

EXPERIMENT AND ANALYSIS OF A BAMBOO FRAME MODEL UNDER LATERAL IMPACT LOAD

针对第六届全国大学生结构设计竞赛命题要求设计一个四层缩尺竹质吊脚楼框架,测试其在侧向冲击载荷作用下的加速度响应.采用有限元软件LS-DYNA,对模型进行模拟分析.结果表明,有限元计算与加载测试所得的加速度时程曲线吻合较好.以该模型为基础进行参数分析,结果表明随拉带初始松弛量增大、撞击板质量减小,结构加速度响应增大;相较入射球质量,入射球速度对结构峰值加速度的影响更敏感,随入射球速度增大,结构峰值加速度增大.

According to the requirement proposed by the Sixth National Structure Design Contest for college students （NSDCCS）, a four-storey bamboo frame model raised floor house is built and experimented under a lateral impact load. The acceleration response is measured.and the FEA software LS-DYNA is used to carry out the finite element analysis to investigate the dynamic mechanism of the frame. The numerical simulation results are in a good agreement with the experimental acceleration time history curves. Furthermore, a parametric analysis is conducted to study the peak of the acceleration. The results indicate that the models with a higher initial relaxation offset of the tension rods or with a lighter contact plate will increase the acceleration of the frame. With regards to the mass of the impact ball, the velocity affects the peak of the acceleration more sensitively, and the peak acceleration increases with the increase of the ball velocity.