冲击荷载作用下钢管再生混凝土柱损伤评估分析  

Damage assessment of recycled aggregate concrete filled-steel tubular column under impact load

作　　者：陈华艳 刘用滨 罗才松 黄建忠 许力 付朝江 祁皑[2] CHEN Huayan;LIU Yongbin;LUO Caisong;HUANG Jianzhong;XU Li;FU Chaojiang;QI Ai(Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,Fujian University of Technology,Fuzhou 350118,China;College of Civil Engineering,Fuzhou University,Fuzhou 350116,China)

机构地区：[1]福建理工大学福建省土木工程新技术与信息化重点实验室,福州350118 [2]福州大学土木工程学院,福州350116

出　　处：《振动与冲击》2024年第12期97-108,共12页Journal of Vibration and Shock

基　　金：国家自然科学基金(5227080392);福建省自然科学基金(2022J01928)。

摘　　要：为研究钢管再生混凝土柱在冲击荷载作用下的损伤,进行了16根钢管再生混凝土柱的落锤冲击试验。在试验的基础上建立了钢管再生混凝土柱的有限元模型,分析不同冲击速度、冲击质量、截面含钢率对钢管再生混凝土柱损伤程度的影响。通过控制冲击质量与冲击速度,基于损伤因子d_(s)和弹塑性转角θ,划分损伤评估等级,拟合钢管再生混凝土柱损伤评估曲线。结果表明:建立的有限元模型能很好地吻合落锤冲击试验的结果,最大误差不超过10%;冲击过程中跨中挠度峰值出现时间远远滞后于冲击力峰值出现的时间,冲量是动量的1.23倍;随着冲击速度的增加,跨中挠度呈抛物线形的增长趋势,冲击质量增加对冲击力峰值影响较小,但对跨中挠度有较大影响,随着截面含钢率的增加,构件的耗能几乎稳定在90%附近;从损伤曲线图可以快速判断钢管再生混凝土柱的整体损伤情况及局部损伤情况。To study the damage of a recycled aggregate concrete filled-steel tubular(RACFST) column under impact load,16 RACFST columns were subjected to drop hammer impact tests.Based on the test,a finite element model of RACFST was established to analyze the influence of different impact velocity,impact mass and section steel content on the damage degree of the RACFST columns.By controlling impact mass and impact velocity,damage assessment grades were divided based on damage factor d_(s) and elastic-plastic angle θ,and the damage assessment curves of the RACFST columns were fit by simulation.The results show that the difference between FEM results and experimental results is less than 10%,and the former can reflect the change of the latter.The peak time of mid-span deflection in the impact process lagged far behind the peak time of impact force,and impulse is 1.23 times of momentum.With the increase of impact velocity,the mid-span deflection increases in a parabolic trend.The increase of impact mass has little effect on the peak of impact force but has great effect on the mid-span deflection.With the increase of steel content in the section,the energy consumption of the member almost stabilizes around 90%.The overall damage and local damage of the RACFST columns could be quickly judged from the damage curve.

关 键 词：钢管再生混凝土柱 落锤冲击 有限元模拟 冲击能量 损伤评估 

分 类 号：TU398[建筑科学—结构工程]