Theoretical study on the confine-stiffening effect and fractal cracking of square concrete filled steel tubes in tension loads

doi:10.1007/s11709-021-0763-3

Frontiers of Structural and Civil Engineering

2021, Vol. 15

Issue (6): 1317-1336 https://doi.org/10.1007/s11709-021-0763-3

本期目录

Theoretical study on the confine-stiffening effect and fractal cracking of square concrete filled steel tubes in tension loads

Meng ZHOU^1,^2,³, Jiaji WANG⁴(

), Jianguo NIE², Qingrui YUE¹

¹. Central Research Institute of Building and Construction Co., Ltd., MCC, Beijing 100088, China
². Department of Civil Engineering, Tsinghua University, Beijing 100086, China
³. Zhuhai Institute of Civil Construction-Safety Research Co., Ltd., Zhuhai 519000, China
⁴. Department of Civil and Environmental Engineering, University of Houston, Houston, TX 77054, US

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Abstract：

Tension stress in steel-concrete composite is widely observed in engineering design. Based on an experimental program on tension performance of three square concrete-filled tubes (SCFT), the tension theory of SCFT is proposed using a mechanics-based approach. The tension stiffening effect, the confining strengthening effect and the confining stiffening effect, observed in tests of SCFTs are included in the developed tension theory model. Subsequently, simplified constitutive models of steel and concrete are proposed for the axial tension performance of SCFT. Based on the MSC.MARC software, a special fiber beam-column element is proposed to include the confining effect of SCFTs under tension and verified. The proposed analytical theory, effective formulas, and equivalent constitutive laws are extensively verified against three available tests reported in the literature on both global level (e.g., load-displacement curves) and strain level. The experimental verification proves the accuracy of the proposed theory and formulations in simulating the performance of SCFT members under tension with the capability to accurately predict the tensile strength and stiffness enhancements and realistically simulate the fractal cracking phenomenon.

Key words： square concrete filled tubes confine-stiffening confine-strengthening fractal cracking fracture

收稿日期: 2021-06-06 出版日期: 2022-01-21

Corresponding Author(s): Jiaji WANG

引用本文:

. [J]. Frontiers of Structural and Civil Engineering, 2021, 15(6): 1317-1336.
Meng ZHOU, Jiaji WANG, Jianguo NIE, Qingrui YUE. Theoretical study on the confine-stiffening effect and fractal cracking of square concrete filled steel tubes in tension loads. Front. Struct. Civ. Eng., 2021, 15(6): 1317-1336.

链接本文:

https://academic.hep.com.cn/fsce/CN/10.1007/s11709-021-0763-3
https://academic.hep.com.cn/fsce/CN/Y2021/V15/I6/1317

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literature	specimen	α_strength (EXP)	α_strength (FEA)	$α strength (FEA) α strength (EXP)$	α_stifness (EXP)	α_stifness (FEA)	$α strength (FEA) α strength (EXP)$
Zhou et al. [6]	ST-200-6	1.027	1.105	1.076	1.268	1.108	0.874
	ST-200-3	1.083	1.110	1.025	1.314	1.171	0.891
	ST-100-3	1.047	1.105	1.055	1.371	1.108	0.808
	mean	1.052	1.107	1.052	1.318	1.129	0.858
	standard error	–	–	0.026	–	–	0.044

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