钢构套加固震损CFSST框架边节点地震损伤评估  

Seismic damage assessment of damaged CFSST frame exterior joints strengthened by enveloped steel

作　　者：许成祥[1,2,3] 廖泽瀚 XU Chengxiang;LIAO Zehan(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,Hubei,China;Hubei Provincial Engineering Research Center of Urban Regeneration,Wuhan 430065,Hubei,China;Institute of High Performance Engineering Structure,Wuhan University of Science and Technology,Wuhan 430065,Hubei,China)

机构地区：[1]武汉科技大学城市建设学院,湖北武汉430065 [2]城市更新湖北省工程研究中心,湖北武汉430065 [3]武汉科技大学高性能工程结构研究院,湖北武汉430065

出　　处：《地震工程学报》2025年第3期512-521,565,共11页China Earthquake Engineering Journal

基　　金：国家自然科学基金项目(51178057);湖北省高等学校优秀中青年科技创新团队计划项目(T201303)。

摘　　要：为了对钢构套加固震损方钢管混凝土(CFSST)框架边节点地震损伤进行评估,基于已有试验,采用ABAQUS有限元软件建立数值模型,通过材料性能折减的方法来模拟地震损伤影响,选择合适的地震损伤模型,探究节点的损伤演化规律,运用该模型研究外包钢构套强度、外包钢构套厚度、外包钢构套非核心区加固高度对方钢管混凝土柱框架边节点的抗震承载力的影响。结果表明:材料性能折减法能够较好模拟地震损伤;通过计算得出轻度震损和中度震损的试件经加固后其抗震性能能够恢复甚至超过原始试件;当钢构套强度由Q235分别提升至Q345、Q390、Q420时,节点的极限荷载分别提高了6.27%、10.57%、13.70%;当钢构套厚度从4 mm提升至6 mm、8 mm时,节点的极限荷载分别提高了4.02%、9.68%;提升钢构套非核心区高度对节点的抗震承载力影响较小,将钢构套高度由200 mm提升至400 mm,其屈服荷载和极限荷载分别提高了0.86%和4.56%。To evaluate the seismic damage of damaged concrete-filled steel square tubular(CFSST)frame exterior joints strengthened by enveloped steel,a numerical model was developed using finite element software ABAQUS based on prior experimental studies.Seismic damage was simulated using a material property reduction method,and an appropriate seismic damage model was employed to investigate the damage evolution mechanism of the joints.The study systematically examined the effects of enveloped steel's strength,thickness,and non-core zone reinforcement height on the seismic bearing capacity of CFSST frame exterior joints.Results indicate the following:(1)The material property reduction method accurately replicates the effects of seismic damage.(2)Strengthening lightly and moderately damaged specimens with enveloped steel restores or even surpasses their original seismic performance.(3)Increasing the enveloped steel material strength from Q235 to Q345,Q390,and Q420 increases the joint's ultimate load capacity by 6.27%,10.57%,and 13.70%,respectively.Increasing the thickness of enveloped steel from 4 mm to 6 mm and 8 mm improved the ultimate load capacity by 4.02%and 9.68%,respectively.Extending the non-core zone reinforcement height of enveloped steel has a minimal effect on seismic capacity.Increasing the height from 200 mm to 400 mm improved the yield load and ultimate load by 0.86%and 4.56%,respectively.

关 键 词：方钢管混凝土框架边节点 外包钢套加固 地震损伤评估 损伤模型 有限元分析 

分 类 号：TU398[建筑科学—结构工程]