多点冲击荷载作用下单层球面网壳试验研究  

Experimental study on single-layer spherical reticulated shell under multipoint impact load

作　　者：吴长[1,2] 杨佑佩 苟宝龙 张瑞芹 WU Chang;YANG Youpei;GOU Baolong;ZHANG Ruiqin(School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China;Gansu Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Lanzhou 730050, China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050

出　　处：《哈尔滨工程大学学报》2021年第9期1271-1279,共9页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51608245).

摘　　要：为研究网壳结构在多点冲击荷载下的动力性能,本文通过对K6型单层球面网壳进行多点弹性冲击试验研究,分析冲击过程关键杆件动应变峰值,关键节点位移峰值及加速度时程曲线,发现冲击点数量和冲击位置对网壳结构冲击区的动力响应影响较大。通过ANSYS/LS-DYNA建立了试验模型的等尺寸模型,综合对比试验与数值模拟结果发现:模拟结果与试验结果吻合较好,结构动力响应变化趋势相同。研究发现:随着冲击点数的增加,网壳冲击区的应变、位移及加速度逐渐增加;在相同的冲击点数量及冲击速度下,冲击点越集中,网壳结构冲击区的应变、位移及加速度越大;当冲击点数量一定时,冲击点距离网壳结构顶点越远,网壳结构冲击区的位移越小。To assess the dynamic performance of the reticulated shell structure under multipoint impact load,the strain peaks of key members,displacement peaks,and acceleration time history curves of key nodes in the impact process are analyzed through the experimental study of the K6 single-layer spherical reticulated shell under multipoint impact load.The results show that the effects of the number and position of the impact points on the dynamic response of the impact zone of the reticulated shell structure are large.A model with a size equal to the test model is established with ANSYS/LS-DYNA.The simulation results are consistent with the test results,and the variation trends of the dynamic response of the structure are the same.The results show that the strain,displacement,and acceleration of the impact area of the reticulated shell gradually increase with the increase in the number of impact points.Under the same number of impact points and impact speed,the more concentrated the impact point is,the greater is the strain,displacement,and acceleration of the impact area of the reticulated shell structure.When the number of impact points is constant,the farther the impact point from the top of the reticulated shell structure,the smaller is the displacement of the impact area of the reticulated shell structure.

关 键 词：网壳结构 多点冲击 试验研究 数值模拟 动力响应 节点刚度 冲击位置 材料应变率 

分 类 号：TU399[建筑科学—结构工程]