钢混组合梁栓钉锈胀下混凝土板开裂行为数值分析

doi:10.13229/j.cnki.jdxbgxb.20221195

Abstract

Abstract:

In the long-term service of steel-concrete composite beams， due to the carbonization of concrete and the intrusion of chloride ions， the passive film on the surface of the stud connectors is destroyed， and the studs will rust. The corrosion expansion of the stud connector will cause the cracking of the concrete slab， which will seriously affect the durability and safety of the steel-concrete composite structure. In order to study the cracking behavior of concrete slab in steel-concrete composite beams caused by the corrosion expansion of stud connector in corrosive environment， the plastic damage model of concrete slabs were established by using ABAQUS finite element analysis software in this paper. The uniform radial displacement of the stud hole is used to simulate the corrosion expansion of the stud， and the cohesion zone model based on the traction-separation law is used to simulate the concrete cracking. Considering 3 different constraint boundaries， 4 different stud spacing and 4 different stud diameters， the corrosion expansion stress distribution and cracking behavior of concrete slabs were investigated. The research results show that， with the increase of boundary constraints， concrete slab will be cracked due to the larger corrosion depth of the studs. The transverse spacing is increased from 50 cm to 80 cm， and the corrosion depth required for concrete edge cracking is increased to 1.59 times. When the diameter of stud increases from 16 mm to 25 mm， the corrosion depth required for concrete edge cracking decreases to 0.87 times.

Key words: bridge engineering, stud connector, corrosion expansion, concrete slab, cracking, numeric analysis

CLC Number:

TU398.9

Lin XIAO,Huan-bo WEI,Xing WEI,Zhi-rui KANG. Numerical analysis on cracking behavior of concrete slab due to corrosion expansion of stud connector in steel-concrete composite beam[J].Journal of Jilin University(Engineering and Technology Edition), 2024, 54(7): 1958-1965.

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材料参数	取值
偏心率	0.1
屈服面形态系数K	0.667
弹性模量/MPa	3.45×10⁴
黏性参数	1×10^-5
膨胀角	30°
抗拉强度f_t/MPa	2.65
泊松比	0.2
双单轴抗压强度比f_b0/f_c0	1.16

栓钉间距/ cm		状态	径向位移/ μm	锈蚀深度/ μm	锈胀力/ MPa
纵向 100	横向 50	边缘开裂	18.8	9.4	11.47
	横向 50	裂缝贯通	37.2	18.6	13.68
	横向 60	边缘开裂	19.1	9.55	12.44
	横向 60	裂缝贯通	37.6	18.8	14.68
	横向 70	边缘开裂	22.5	11.25	13.33
	横向 70	裂缝贯通	43.2	21.6	15.9
	横向 80	边缘开裂	29.8	14.9	14.6
	横向 80	裂缝贯通	50.2	25.1	17.1
横向 50	纵向 100	边缘开裂	18.8	9.4	11.47
	纵向 100	裂缝贯通	37.2	18.6	13.68
	纵向 120	边缘开裂	18	9	11.2
	纵向 120	裂缝贯通	35.9	17.9	14.1
	纵向 140	边缘开裂	17.1	8.55	11.05
	纵向 140	裂缝贯通	35.1	17.55	14.7
	纵向 160	边缘开裂	17	8.5	11.2
	纵向 160	裂缝贯通	34.4	17.2	15.16

栓钉直径/mm	状态	径向位移/μm	锈蚀深度/μm	锈胀力/MPa
16	边缘开裂	24.8	12.4	13.8
16	裂缝贯通	45.92	22.96	18.6
19	边缘开裂	23.7	11.85	12.63
19	裂缝贯通	48.7	24.35	18.5
22	边缘开裂	22.7	11.35	11.0
22	裂缝贯通	49.2	24.6	17.1
25	边缘开裂	21.7	10.85	10.0
25	裂缝贯通	43.0	21.5	15.1

Numerical analysis on cracking behavior of concrete slab due to corrosion expansion of stud connector in steel-concrete composite beam

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