摘要
为研究薄壁不锈钢管-钢骨混凝土组合短柱的轴压力学性能,以含钢率和混凝土强度为试验变量,设计了6个薄壁不锈钢管混凝土组合短柱,包含4个不锈钢管-钢骨混凝土组合短柱,2个不锈钢管混凝土组合短柱对比试件。通过不锈钢管组合短柱轴压性能试验结果,分析各试件的破坏形态、荷载-位移曲线、承载力及应变特征,并研究了不同变量对极限承载力及残余承载力的影响规律。研究结果表明:不锈钢管-钢骨混凝土组合短柱具有较高的承载能力和较好的延性;含钢率对试件承载力影响较大,随着含钢率增大,试件承载力显著提高;混凝土强度的提高也显著提高了试件的承载力。采用欧洲EC4、中国GB 50936标准及相关学者提出的理论计算式计算了不锈钢管-钢骨混凝土组合短柱的极限承载力,结果表明:考虑钢管及钢骨双重约束效应的理论计算式能较为准确地预测不锈钢管-钢骨混凝土柱承载力。
In order to study the mechanical properties of thin-walled stainless steel tube composite short columns filled with steel-reinforced concrete,six concrete filled thin-walled stainless steel tube composite short columns were designed,including four stainless steel tube composite columns filled with steel-reinforced concrete and two concrete filled stainless steel tube stub columns for comparison. The failure modes,load-displacement curves,bearing capacity and strain characteristics of each specimen were analyzed by the results of axial compression performance test of stainless steel pipe composite short columns. The effects of different variables on the ultimate bearing capacity and residual bearing capacity were studied. The test results showed that stainless steel tube composite short columns filled with steel-reinforced concrete had higher bearing capacity and better ductility. The steel ratio had a great influence on the ultimate bearing capacity. The ultimate bearing capacity of specimens was improved significantly with the increase of steel ratio and concrete strength. The test results of bearing capacity were compared with the predicted bearing capacity using the Eurocode 4,GB 50936 and the proposed formula by related scholars. The formula considering the dual confinement effect of steel tube and section steel could predict accurately the bearing capacity of stainless steel tube composite short column filled with steel-reinforced concrete.
作者
乔崎云
张雯雯
曹万林
董宏英
武海鹏
QIAO Qiyun;ZHANG Wenwen;CAO Wanlin;DONG Hongying;WU Haipeng(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China)
出处
《工业建筑》
CSCD
北大核心
2020年第2期143-149,共7页
Industrial Construction
基金
国家自然科学基金资助项目(51578020)
北京市博士后工作经费资助项目(2017-ZZ-055)。
关键词
不锈钢管
钢骨混凝土
组合短柱
轴压
承载力
stainless steel
steel-reinforced concrete
composite stub columns
axial compression
bearing capacity
