悬臂变截面空心柱受突加荷载作用的冲击分析  

Impact analysis for cantilever variable cross-section hollow column under sudden load

作　　者：陈玉骥[1] 唐嘉佑 陆建新 罗旗帜[1,3] 陈舟 Chen Yuji;Tang Jiayou;Lu Jianxin;Luo Qizhi;Chen Zhou(Civil Engineering Department,Foshan University,528000,Foshan,China;China Construction Steel Structure Corp.LTD.,510000,Guangzhou,China;School of Civil Engineering,Hunan University,410082,Changsha,China)

机构地区：[1]佛山科学技术学院土木工程系,佛山528000 [2]中建钢构有限公司,广州510000 [3]湖南大学土木工程学院,长沙410082

出　　处：《应用力学学报》2020年第5期2274-2279,I0030,共7页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(10772046);全国优秀博士学位论文作者专项资金(200954)。

摘　　要：悬臂变截面空心柱是工程上应用较广的结构形式之一。根据冲击力学理论,考虑惯性力的影响,研究了悬臂变截面空心柱在突加荷载作用下的动力特性;基于不同荷载位置和荷载量值所对应的运动模式,推导了塑性铰的位置参数、杆件的加速度和弯矩、剪力的公式;分析了荷载值的大小、荷载作用位置、柱的跨度、横截面直径和壁厚对塑性铰位置参数和悬臂端点加速度的影响。结果表明:塑性铰的位置参数η与荷载位置参数ξ、直径D0以及壁厚th的关系基本相同;悬臂端的加速度aA随ξ、L、D0、th的变化趋势类似。Cantilever variable cross-section hollow column is one of engineering structures used widely. Considering the influence of inertia force, the dynamic characteristics of the cantilever variable cross-section hollow column under sudden load are studied based on the impact mechanics theory. Based on the corresponding motion model of different load positions and load values, the position parameters of plastic hinge, the formula of the acceleration and bending moment, shear force of the column are derived, respectively. The influences of value and location of the load, column length, the diameter of cross section and wall thickness on the plastic hinge position and the acceleration at cantilever endpoint are analyzed. It shows that the relationships between the position parameter η of plastic hinge and the load position parameter ξ, the diameter D0 and the wall thickness th are basically the same. The change trend of acceleration aA at cantilever endpoint with ξ, L, D0, th are similar.

关 键 词：冲击 变截面柱 突加荷载 塑性极限弯矩 悬臂端的加速度 

分 类 号：O342[理学—固体力学]