薄壁圆锥管轴向压缩吸能特性研究  

Energy absorbing characteristics of tapered circular tubes under axial compression

作　　者：洪武[1] 徐迎[1] 金丰年[1] 郭峰 

机构地区：[1]解放军理工大学国防工程学院,南京210007 [2]江苏建达建设股份有限公司,南京210009

出　　处：《振动与冲击》2015年第5期88-94,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金创新研究群体科学基金(51021001);国家自然科学基金(51078351);重庆交通大学(桥梁)结构工程重点实验室开放基金(CQSLBF-Z11-1);岩土力学与堤坝工程教育部实验室(河海大学)开放基金(GH200905)资助项目

摘　　要：研究薄壁圆锥管轴向压缩吸能特性有助于其合理广泛应用于抗冲击、抗振动结构中。轴向倾角是使得圆锥管轴向压缩性能有别于直管的主要因素。当轴向倾角小于临界角度时,圆锥管平均轴向压缩力随倾角增加而变大但最大初始轴力会线性减小;吸能稳定因子随倾角增加而提高,但是比吸能却相应非线性降低。圆锥管在轴向压缩时过程中存在三种典型变形模式,分别为"钻石-堆叠"模式,"钻石-嵌套"模式及"环形-嵌套"模式,通过对"环形-嵌套"模式变形过程的观测及变形机理分析,建立了相应的理论模型,基于该理论模型给出了圆锥管"环形-嵌套"模式变形时吸能特性的预测方法。The study of energy absorption performance of tapered circular tubes under axial compression is valuable as they are used as anti-impaction and anti-vibration devices. Taper angle is the main factor which makes tapered circular tubes behave differently from common circular tubes. Raising taper angle can improve the energy absorption stability but weaken the energy absorption capability. Furthermore,the mean axial compressive force is enhanced and the initial peak axial force drops as taper angle increases. Three representative deformation modes,namely,diamond-stack mode,diamond-radial mode and ring-radial concertina mode,are ensured for tapered circular tubes under axial compression.Here,the theoretical model for ＂ring-radial concertina＂mode was built and its deformation mechanism was analyzed with the plasticity theory. Then,the way of predicting the energy absorption ability of tapered circular tubes was obtained.

关 键 词：薄壁结构 圆锥管 吸能机制 

分 类 号：TU391[建筑科学—结构工程]