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

摘要/Abstract

摘要：

为研究腐蚀环境中钢-混组合梁栓钉锈胀引发的混凝土板开裂行为，本文利用ABAQUS有限元分析软件建立混凝土板塑性损伤模型。采用环向均匀位移模拟栓钉锈胀作用，选用基于牵引力-分离法则（Traction-separation law）的粘聚区模型模拟混凝土开裂，计算分析3种不同约束边界、4种不同栓钉间距及4种栓钉直径条件下，混凝土板锈胀应力分布及开裂行为。研究结果表明：随着边界约束的增加，栓钉需要更大的腐蚀深度才会引起混凝土板开裂。栓钉横向间距从50 cm增加到80 cm，使混凝土边缘开裂需要锈蚀深度增加到1.59倍。栓钉直径从16 mm增加到25 mm，使混凝土边缘开裂需要锈蚀深度减小到0.87倍。

关键词: 桥梁工程, 栓钉连接件, 锈胀, 混凝土板, 开裂, 数值分析

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

中图分类号:

TU398.9

肖林,魏欢博,卫星,康志锐. 钢混组合梁栓钉锈胀下混凝土板开裂行为数值分析[J]. 吉林大学学报(工学版), 2024, 54(7): 1958-1965.

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