Multi-Factor Model of Plastic Development Coefficient and Strength Calculation for Rectangular Concrete-Filled Steel Tube Members Under Pure Bending

doi:10.12141/j.issn.1000-565X.240059

Abstract

Abstract:

The constraint effect of rectangular steel pipe on core concrete has special characteristics, and the accurate prediction of the plastic development capacity of bending members can effectively ensure the load-bearing safety. In order to improve the calculation accuracy of the sectional strength of rectangular CFST members under pure bending, this study established a multi-factor model of plastic development coefficient and an improved bending strength model based on the confinement coefficient and further considering the influence of height-width ratio and steel ratio. First of all, based on the unified theory of CFST members, the change law of plastic development coefficient of rectangular concrete-filled steel tube was studied and compared with the current standard calculation formula. Then, combined with the specification and engineering needs, 2 160 numerical simulation components of rectangular CFST members under pure bending were constructed and the refined analysis of the fiber model method was conducted using the improved constitutive relationship and component failure criterion. The influence of width-thickness ratio, height-width ratio, steel ratio and strength ratio on plasticity development coefficient was investigated to determine that the height-width ratio and steel ratio are the main factors influencing the plasticity development coefficient, and the function expressions related to the height-width ratio and steel ratio were fitted through regression analysis. Thus the multi-factor model of plasticity development coefficient and strength calculation of rectangular CFST members under pure bending were established. Finally, the bending strength improvement model was verified against the main design specifications at home and abroad by using the 128 sets of experimental data collected. The results show that the established multi-factor model of plasticity development coefficient overcomes the defects of the current specification that the calculation model is not accurate enough, and it can more accurately reflect the plasticity development capacity of rectangular CFST members under pure bending. The established improvement model of the bending strength of rectangular CFST members under pure bending solved for the ratio of the ultimate load carrying capacity to the experimental value has a mean value of 0.971 and a root-mean-square error of 0.118, indicating a good match and a higher calculation accuracy.

Key words: rectangular concrete-filled steel tube, plasticity development coefficient, bending strength, fiber model method

CLC Number:

TU398

PANG Mulin, XIE Weiwei, YANG Lufeng. Multi-Factor Model of Plastic Development Coefficient and Strength Calculation for Rectangular Concrete-Filled Steel Tube Members Under Pure Bending[J]. Journal of South China University of Technology(Natural Science Edition), 2024, 52(11): 21-31.

Figures/Tables 10

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f_y/MPa	f_cu，k/MPa	B/mm	t/mm	β	α
200	30~100	100~400	2~10	0.50~2.00	0.03~0.39
300	30~100	100~400	2~10	0.50~2.00	0.03~0.39
400	30~100	100~400	2~10	0.50~2.00	0.03~0.39
500	30~100	100~400	2~10	0.50~2.00	0.03~0.39
600	30~100	100~400	2~10	0.50~2.00	0.03~0.39
700	30~100	100~400	2~10	0.50~2.00	0.03~0.39

数据来源	数量	β	θ	f_y/MPa	f_ck/MPa
汇总	128	0.5~2.0	11.3~105.3	198.0~750.0	12.5~89.3
文献［22］	4	1.0	23.5~44.1	198.0~311.0	12.5~16.9
文献［23］	12	0.6~1.7	16.0~39.7	377.0~432.0	34.2~39.4
文献［11］	16	1.0~2.0	20.5~50.0	293.8~330.1	16.7~26.0
文献［19］	18	1.0	46.7~105.3	235.0~282.0	43.9~59.6
文献［24］	8	1.0~1.7	11.3~18.8	410.0	32.1~54.1
文献［25］	6	1.0~1.6	26.2~50.7	316.6~319.3	71.9
文献［12］	12	1.0~1.7	25.3~31.0	409.0~495.0	56.4~82.1
文献［26］	5	1.0	42.0~102.0	300.0	23.0~37.8
文献［27］	3	1.0	22.0~42.0	750.0	24.2~26.0
文献［28］	9	1.0	22.5	345.0	14.5~21.8
文献［29］	3	1.0	16.0~16.7	465~756	89.1~89.3
文献［30］	6	1.0~2.0	46.2	363.0	49.1
文献［31］	16	1.0	22.0~42.9	261.0~392.0	25.6~30.4
文献［13］	6	1.0	25.0~37.5	416.3~436.9	59.9
文献［32］	4	0.5~1.0	50.1~100.1	392.0~402.0	36.1

方法	μ_R	RMSE
CFST国标^［9］	1.073	0.220
CFST地标^［10］	0.902	0.150
美国AISC^［3］	0.853	0.188
日本AIJ^［5］	0.769	0.247
欧洲EC4^［4］	0.886	0.144
英国BS5400^［6］	0.814	0.201
文中提出的方法	0.971	0.118

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