- 摘 要
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(1 西安建筑科技大学土木工程学院, 西安 710055; 2 广西大学土木建筑工程学院, 南宁 530004)
[摘要]为研究钢管高强混凝土柱轴压性能,以混凝土强度和长径比为变化参数设计5个试件进行轴心受压加载试验,并与空钢管和素混凝土试件进行对比。试验结果表明,钢管高强混凝土试件和空钢管试件的破坏形态呈腰鼓形破坏,素混凝土试件的破坏形态为纵向劈裂破坏;除素混凝土试件外,所有试件荷载-轴向变形曲线的变化趋势基本相似,都经历上升段、下降段、再回升段三个历程;钢管高强混凝土试件的极限承载力随核心混凝土强度的提高而增大,随长径比的增大而降低。采用统一强度理论和套箍理论提出的计算方法对钢管高强混凝土柱承载力进行计算发现,《钢-混凝土组合结构设计规程》(DL/T 5085—1999)和《钢管混凝土结构技术规程》(CECS 28∶2012)的计算结果与试验结果吻合较好,可用于钢管高强混凝土柱的设计。
[关键词]钢管混凝土; 高强混凝土; 轴压试验; 极限承载力
中图分类号:TU398 文献标识码:A 文章编号:1002-848X(2014)16-0046-04
Experimental study on the axial compression performance of high-strength concrete filled steel tube columns
Ke Xiaojun1,2, Chen Zongping2, Ying Wudang2, Xue Jianyang1
(1 School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China; 2 College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China)
Abstract: To study the axial compression performance of high-strength concrete filled steel tube (HCFST) columns, 5 HCFST specimens and 2 contrastive specimens (one hollow steel tube specimen and one pure concrete specimen) were designed for the axial compresion test considering the variable parameters of concrete strength and length-diameter ratio. Test results indicate that HCFST specimens and hollow steel tube specimen are waist-shaped failure, and the pure concrete specimen is vertical splitting failure. Load-axial displacement curves of all specimens except the pure concrete specimen are basically similar, they all experience three stages as rising stage, falling stage and rally stage. The ultimate bearing capacity of HCFST specimens increases with the increase of concrete strength and decreases with the increase of length-diameter ratio. According to the analysis of ultimate bearing capacity of HCFST columns by the calculated formulas of Unified Strength Theory and Confinement Theory, the results calculated by Code for design of steel-concrete composite structure (DL/T 5085—1999) and Technical specification for concrete-filled steel tubular structures(CECS 28∶2012) are in good agreement with the test results, and it indicates that HCFST columns can be designed with DL/T 5085—1999 and CECS 28∶2012.
Keywords: concrete filled steel tube; high-strength concrete; axial compression test; ultimate bearing capacity
*国家自然科学基金(50908057,51268004),广西自然科学基金项目(2012GXNCFAA053203),广西科技攻关项目(桂科攻12118023-3)。
通讯作者:陈宗平,博士,教授,Email:zpchen@gxu.edu.cn。
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