侧向冲击下不同长细比薄壁方钢管-砂卵石柱动力响应分析  

Analysis of slenderness ratios on dynamic response to sandy pebble filled square thin-walled steel tube column under impact loading

作　　者：陈代果 马宏昊[1] 沈兆武[1] 邓勇军 徐刚 CHEN Daiguo;MA Honghao;SHEN Zhaowu;DENG Yongjun;XU Gang(CAS Key Laboratory of Mechanical Behavior and Design of Materials(LMBD),University of Science and Technology of China,Hefei 230026,China;Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province,Mianyang 621000,China)

机构地区：[1]中国科学技术大学中国科学院材料力学行为和设计重点实验室,安徽合肥230026 [2]工程材料与结构冲击振动四川省重点实验室,四川绵阳621000

出　　处：《防护工程》2022年第1期10-15,共6页Protective Engineering

基　　金：国家自然科学基金(12002293);四川省科技厅应用基础项目(2018JY0496)

摘　　要：以长细比为变量开展了薄壁方钢管-砂卵石柱侧向冲击试验,分析了冲击力时程曲线、试件的破坏形态以及残余变形量,并结合损伤评估准则分析了长细比与柱损伤度的关系。结果表明:在侧向冲击荷载作用下,各试件的波动段平台值和作用时间有显著的差异,长细比越大,平台值越小,作用时间越长;在竖向荷载作用下,试件损伤度随着长细比增大而呈现先增大后减小趋势,且受损试件在达到极限承载力值后出现缓慢过渡阶段。Sandy pebble filled square thin-walled steel tube column specimens were tested under different slenderness ratios and lateral impact by independent designing of a drop-hammer-tester, which recorded time-history curves and got the damage form and residual deformation of specimens. Based on the damage assessment criteria of residual capacity, the damage degree is defined to determine the damage assessment degree of sandy pebble filled square thin-walled steel tube column, analyzing the relationship between slenderness ratios and damage degree. The test results showed that there was a significant difference about platform value and function time of volatility of specimens under lateral impact load, and the larger the slenderness ratio, the smaller values of platform and the longer time;damage degree of specimens appeared to increase then decreasing trend with the slenderness ratio under vertical load, and the damaged specimens had a slow transition after reaching ultimate bearing capacity.

关 键 词：长细比 砂卵石 薄壁方钢管柱 冲击荷载 损伤度 

分 类 号：TU3[建筑科学—结构工程]