中空夹层钢管钢渣混凝土T形节点抗震性能研究  

Experimental and analytical studies on seismic performance of a steel slag CFDST T⁃joint

作　　者：曾武华[1,2] 王伟 陈庆熠 王军芳[1,2] 吴应雄 卓卫东[4] ZENG Wu-hua;WANG Wei;CHEN Qing-yi;WANG Jun-fang;WU Ying-xiong;ZHUO Wei-dong(School of Civil Engineering,Sanming University,Sanming 365004,China;Key Laboratory of Intelligent Construction and Monitoring of Engineering Structures in Fujian Province College,Sanming 365004,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]三明学院建筑工程学院,福建三明365004 [2]工程结构智能建造与监控福建省高校重点实验室,福建三明365004 [3]同济大学土木工程防灾减灾全国重点实验室,上海200092 [4]福州大学土木工程学院,福建福州350108

出　　处：《振动工程学报》2024年第6期1023-1032,共10页Journal of Vibration Engineering

基　　金：福建省自然科学基金资助项目(2023J01131900,2022J011185);国家自然科学基金资助项目(52378495)。

摘　　要：将钢渣混凝土灌入中空夹层钢管混凝土结构,充分利用钢渣混凝土的微膨胀性和中空夹层内外钢管对混凝土的约束作用,有效解决了钢渣混凝土工程应用中的安定性问题。以混凝土类型、空心率、支主管直径比和轴压比为参数变量,共进行了5个中空夹层钢管混凝土T形节点试件(1个普通混凝土试件、4个钢渣混凝土试件)拟静力试验研究。试验结果表明:与灌注普通混凝土相比,灌注钢渣混凝土对试件节点承载力影响不大,但位移延性和耗能能力明显增加,提高幅度分别达69.46%和48.20%;当空心率从0.3增大到0.5时,试件位移延性系数提高9.69%;当支主管直径比从0.40增大到0.68时,位移延性系数提高82.44%;当轴压比从0.1增大到0.2时,试件位移延性系数降低17.98%。建立有限元模型对试件的滞回性能进行了模拟,模拟结果与试验结果基本符合,验证了所建有限元模型的有效性。进而开展了节点承载力影响参数分析,得到最佳空心率为70%左右。钢渣在钢管混凝土结构中应用,可大幅提高其抗震性能。Concrete filled double-skin tubular structures(CFDST)that reuse waste steel slag demonstrate advantages in sustain-able resource use.The interaction and coordination between steel tube and concrete make CFDST an effective solution to the stabil-ity issues,considering the expansion characteristic of steel slag.The expansion performance of the steel slag concrete can enhance the bond between the steel tube and its sandwich concrete.This paper presents a series of tests on a steel slag CFDST T-Joint un-der pseudo-static loading conditions to investigate its seismic performance.Five specimens were tested,including one ordinary con-crete test specimen and four steel slag concrete test specimens.The variables tested were concrete type,hollow ratio,diameter ra-tio,and axial compression ratio.The results show that while the bearing capacity of steel slag concrete specimens is slightly lower than that of ordinary concrete,the displacement ductility and energy dissipation capacity significantly increased,by 69.46%and 48.20%respectively.As the hollow ratio increases from 0.3 to 0.5,the displacement ductility coefficient of the specimen increases by 9.69%.When the diameter ratio of branch main increases from 0.40 to 0.68,the displacement ductility coefficient increases by 82.44%.However,when the axial compression ratio increases from 0.1 to 0.2,the displacement ductility coefficient of the speci-men decreases by 17.98%.A finite element model was established to simulate the hysteretic properties of the specimen.The simu-lation results are in agreement with the test results,verifying the validity of the finite element model.Based on the verified finite model,the parameters of influencing factors on the bearing capacity of the specimen were analyzed,and the optimum hollow ratio of the specimen was found to be about 70%.The use of steel slag greatly improves the seismic performance of the CFDST T-joint and can be widely used in concrete-filled steel tube engineering structures.

关 键 词：抗震性能:中空夹层钢管混凝土 钢渣混凝土 滞回特性 拟静力试验 

分 类 号：TU352.11[建筑科学—结构工程] TU398.9