冲击荷载下焊接空心球节点的动力响应研究  

A Study on the Dynamic Response of Welded Hollow Spherical Joints Under Impact Loading

作　　者：吴长[1,2] 刘家乐 王仁红 WU Chang;LIU Jiale;WANG Renhong(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Western Center of Disaster Mitigation in Civil Engineering,Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,兰州730050

出　　处：《建筑钢结构进展》2021年第11期82-93,共12页Progress in Steel Building Structures

基　　金：国家自然科学基金(51608245)。

摘　　要：为研究冲击荷载下节点刚度和冲击速度对焊接球节点动力响应的影响,对缩尺节点试件进行不同高度下的冲击试验;采用ANSYS/LS-DYNA软件中的Shell163壳单元模拟焊接球和杆件,采用Solid164实体单元模拟冲击物,建立焊接空心球节点精细化有限元模型。将试验结果和有限元分析结果进行对比,验证有限元模型的有效性。通过改变钢球冲击高度、球节点壁厚和直径,从节点的动应力、动应变、动位移、冲击力以及冲击能量5个方面,对焊接球节点开展动力响应分析。研究结果表明:动力响应随冲击能量的增加而增大;增加焊接球直径相当于削弱了节点的刚度,但削弱幅度不大;增加焊接球壁厚对于提升节点的抗冲击性能有一定作用。In order to study the influence of joint stiffness and impact velocity on the dynamic response of welded ball joints under impact loading,a set of scaled joint specimens are subjected to impact tests at different heights.Shell163 element in ANSYS/LS-DYNA software is used to simulate welded balls and rods.Solid164 element is used to simulate impact objects.A refined finite element model of welded hollow spherical joint is built.The test data are compared with the finite element analysis results to validate the model.By changing the impact height of the impact object,the wall thickness and diameter of ball joint,the dynamic response analysis of the welded spherical joint is performed from five aspects,including dynamic stress,dynamic strain,dynamic displacement,impact force and impact energy.The results show that the dynamic response is enhanced with the increase of impact energy.The increase in the diameter of welding ball is equivalent to weakening the stiffness of joint,but the magnitude is not large.Increasing the wall thickness has a certain effect to improve the impact resistance of the joint.

关 键 词：焊接空心球节点 节点刚度 冲击能量 动力响应 缩尺试验 

分 类 号：TU391[建筑科学—结构工程]