Model Test Study on Steel-Concrete Joint Segment of Arch Foot of A Long-Span Flat Arch Bridge

doi:10.12141/j.issn.1000-565X.250078

Abstract

Abstract:

To investigate the stress behavior and load-transfer mechanism at the steel-concrete joint segment of a flat arch bridge, this study takes a flat arch bridge in Guangdong with a calculated span of 196 m as the engineering background. Based on the Abaqus platform, a refined finite element model of the steel-concrete composite arch abutment was established to analyze the stress level and distribution characteristics of the structure under six unfavorable load cases. In addition, a 1∶8 scaled patial model was fabricated for multi-condition loading tests to study the mechanical behavior of the steel-concrete joint segment under different scenarios. The results indicate that, under all loading cases, the stress in the bottom plate of the steel arch box is most significant, making it the primary load-bearing component, with a maximum stress of -116.875 MPa. In the stress distribution of the bottom plate, the stiffening ribs play a major role, exhibiting the most prominent stress levels compared to other areas. The web area adjacent to the bottom plate of the steel arch box experience the next highest stresses, with a maximum value of -32.16 MPa across all conditions. The stress level in the top plate of the steel arch box is relatively low. The measured stress values in the concrete pile cap are generally small, with a maximum stress not exceeding -0.73 MPa. The axial compressive stress in the steel arch box gradually decreases from the loading end to the concrete pile cap end. When subjected to loads, the steel arch box primarily transfers the applied loads to the concrete pile cap through the bottom plate and the adjacent web regions. Under all test conditions, the stress level at the steel-concrete joint segment is relatively low, as most of the stress from the bottom plate of the steel arch box is dispersed into the concrete pile cap via components such as PBL shear connectors, bearing plates, densely arranged stiffening ribs, and penetrating reinforcement bars.

Key words: flat arch bridge, arch foot, steel-concrete joint segment, model test, finite element model

CLC Number:

U448.22

LIU Wenshuo, LI Ang, WANG Hailong, LUO Qiong, LI Jianquan. Model Test Study on Steel-Concrete Joint Segment of Arch Foot of A Long-Span Flat Arch Bridge[J]. Journal of South China University of Technology(Natural Science Edition), 2025, 53(12): 117-125.

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工况	轴向力/kN	弯矩/（kN·m）	偏心距/m
工况1	-1 715	-429	0.25
工况2	-1 607	-741	0.46
工况3	-2 377	-487	0.21
工况4	-567	-1 519	2.68
工况5	-651	-1 610	2.48
工况6	-626	-2 145	3.42

项目		数量
测试元件	电阻应变片	103
测试元件	指针式位移计	4
加载设备	YDC千斤顶	5
加载设备	力传感器	3
数据采集系统	动态应变采集仪	7
	HBM数据采集系统	1
	微力特斯IMTS材料性能测试仪	1

测点	理论值/MPa	实测值/MPa	绝对误差/MPa	容许误差/MPa
GX1	-73.32	-77.31	4.00	16.72
GX2	-46.97	-49.24	2.27	11.45
GX3	-93.27	-96.78	3.51	20.71
G1	-25.10	-24.71	0.39	7.08
G2	-4.98	-4.04	0.93	3.06
G3	-4.18	-3.14	1.04	2.90
G4	-18.64	-17.18	1.46	5.79
G5	-15.06	-15.80	0.75	5.07
P1	-32.44	-32.16	0.28	8.55
P2	-5.33	-5.55	0.22	3.13
P3	-0.87	-0.30	0.57	2.23

测点	理论值/MPa	实测值/MPa	绝对误差/MPa	容许误差/MPa
GX1	-90.08	-91.33	1.25	20.08
GX2	-50.13	-50.27	0.14	12.09
GX3	-105.04	-104.40	0.64	23.07
G1	-16.67	-15.97	0.70	5.39
G2	-3.18	-2.67	0.51	2.70
G3	-2.96	-2.46	0.50	2.65
G4	8.87	8.18	0.69	3.83
G5	10.99	11.38	0.38	4.26
P1	-28.52	-30.74	2.22	7.76
P2	8.96	7.11	1.85	3.85
P3	3.62	3.24	0.38	2.78