Shear behavior of concrete-encased square concrete-filled steel tube members: Experiments and strength prediction

IF 4 3区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Steel and Composite Structures Pub Date : 2021-01-01 DOI:10.12989/SCS.2021.38.4.431

Yong Yang, Chen Xin, Yicong Xue, Yunlong Yu, Chaorui Zhang

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引用次数: 1

Abstract

This paper presents experiments and theoretical analysis on shear behavior of eight concrete-encased square concrete-ﬁlled steel tube (CECFST) specimens and three traditional reinforced concrete (RC) specimens. A total of 11 specimens with the test parameters including the shear span-to-depth ratio, steel tube size and studs arrangement were tested to explore the shear performance of CECFST specimens. The failure mode, shear capacity and displacement ductility were thoroughly evaluated. The test results indicated that all the test specimens failed in shear, and the CECFST specimens enhanced by the interior CFST core exhibited higher shear capacity and better ductility performance than that of the RC specimens. When the other parameters were the same, the larger steel tube size, the smaller shear span-to-depth ratio and the existence of studs could lead to the more satisfactory shear behavior. Then, based on the compatible truss-arch model, a set of formulas were developed to analytically predict the shear strength of the CECFST members by considering the compatibility of deformation between the truss part, arch part and the steel tube. Compared with the calculated results based on several current design specifications, the proposed formulas could get more accurate prediction.

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方钢管混凝土包壳构件的抗剪性能:试验与强度预测

本文对8个方形钢管混凝土包壳试件和3个传统钢筋混凝土试件的抗剪性能进行了试验和理论分析。共对11个试件进行了剪切跨深比、钢管尺寸、螺柱布置等试验参数的试验，探讨了CECFST试件的抗剪性能。对其破坏模式、抗剪能力和位移延性进行了全面评估。试验结果表明，所有试件均在剪切过程中破坏，且经CFST内芯加固后的CECFST试件比RC试件具有更高的抗剪能力和更好的延性。在其他参数相同的情况下，钢管尺寸越大、剪切跨深比越小、钉钉的存在越能获得较好的剪切性能。然后，在桁架-拱协调模型的基础上，建立了考虑桁架部分、拱部分和钢管变形协调的CECFST构件抗剪强度解析预测公式。与现行几种设计规范的计算结果相比，本文提出的计算公式能够得到更准确的预测结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Steel and Composite Structures 工程技术-材料科学：复合

CiteScore

8.50

自引率

19.60%

发文量

审稿时长

7.5 months

期刊介绍： Steel & Composite Structures, An International Journal, provides and excellent publication channel which reports the up-to-date research developments in the steel structures and steel-concrete composite structures, and FRP plated structures from the international steel community. The research results reported in this journal address all the aspects of theoretical and experimental research, including Buckling/Stability, Fatigue/Fracture, Fire Performance, Connections, Frames/Bridges, Plates/Shells, Composite Structural Components, Hybrid Structures, Fabrication/Maintenance, Design Codes, Dynamics/Vibrations, Nonferrous Metal Structures, Non-metalic plates, Analytical Methods. The Journal specially wishes to bridge the gap between the theoretical developments and practical applications for the benefits of both academic researchers and practicing engineers. In this light, contributions from the practicing engineers are especially welcome.