Aiming at the change of mechanical properties of bridge pile group foundation under corrosion, Abaqus finite element software was used to establish a bridge pile foundation model for analysis. Based on the improved Najar damage theory, the theoretical derivation of the damage evolution parameters in the code is derived. The damage factor is derived. The corrosion of the pile foundation is simulated by the method of reducing the elastic modulus. The spalling thickness represents the corrosion degree of the pile foundation. The displacement and bearing capacity of the pile under load, as well as the axial force and friction resistance of the corner pile, side pile and center pile are studied. The results show that under the working load condition, the load sharing ratio of the corner pile is the highest, followed by the side pile, and the sharing ratio of the middle pile is the lowest. However, as the peeling thickness increases, the difference between the three gradually decreases. The vertical ultimate bearing capacity of pile foundation decreases with the increase of peeling thickness, while the vertical displacement of pile foundation increases with the increase of peeling thickness. Under the action of load, the corner pile first shows signs of damage. In the process of increasing load, the damage range of the central pile gradually expands and deepens due to the increase of the load borne by the central pile. Therefore, enough attention should be paid to the reinforcement of damaged pile group foundation caused by pile foundation corrosion.

Feiqing Lu, Yanzhi Zhu, Yongzhi Jiu. Study on vertical bearing characteristics of pile group foundation considering damage. Academic Journal of Architecture and Geotechnical Engineering (2025), Vol. 7, Issue 1: 77-87. https://doi.org/10.25236/AJAGE.2025.070110.

[1] SHANG Ming-gang, ZHANG Yun-sheng, HE Zhong-mao, et al. Accelerated corrosion test and reliability analysis of reinforced concrete under constant current in saline soil environment [J].Journal of Building Materials, 2022,25 ( 07 ) : 751-759.

[2] Feng Zhongju, Huo Jianwei, Hu Haibo, et al. Corrosion damage and bearing characteristics of bridge pile foundation under dry-wet-freeze-thaw cycles in alpine salt marsh area [J]. Transportation Engineering Journal, 2020,20 ( 06 ) : 135-147.

[3] Tinghui L ,Junqi L ,Jinlong L .Analysis of time-dependent seismic fragility of the offshore bridge under the action of scour and chloride ion corrosion[J]. Structures,2020,281785-1801.

[4] Zheng Yang. Analysis of vertical bearing characteristics and anti-corrosion technology of bridge pile foundation in salt marsh corrosion area [D].Xi 'an : Chang 'an University, 2015.

[5] Jin Weiliang, Guo Hao, Zhang Yixue. Review of Long-Term Deformation and Mechanical Properties of Damaged Concrete Structures [J]. Building Structures, 2024, 54 ( 19 ) : 135-146 + 134.

[6] Cen Zhihao. Life-cycle seismic performance evaluation of bridge pile foundation in liquefied site under the combined action of erosion and corrosion [D]. Guangzhou : Guangzhou University, 2024.

[7] Yao Xianhua, Pei Songwei, Zhao Shunbo. Finite element analysis of bearing characteristics of high pressure jet grouting pile composite foundation [J].North China Institute of Water Resources and Hydropower, 2009,30 ( 01 ) : 93-95.

[8] Wu Qing, Yuan Yingshu. Experimental study on degradation law of mechanical properties of corroded steel bars [J].Journal of Civil Engineering, 2008, ( 12 ) : 42-47.

[9] Shi Lei. Study on bearing capacity and deformation of pile group under vertical load [D].Zhengzhou : Zhengzhou University, 2014.

[10] Li Jingpei, Li Lin, Chen Haohua, et al. Research progress on durability of concrete pile foundation in corrosive environment [J].Journal of Harbin Institute of Technology, 2017,49 ( 12 ) : 1-1

[11] Tian Hao, Tang Fujian, Li Hongnan. Monitoring technology of steel corrosion based on OFDR distributed optical fiber [J].Journal of Building Materials, 2020,23 ( 06 ) : 1524-1530.

[12] Lubliner J, Oliver J, Oller S, et al. A plastic-damage model for concrete[J]. International Journal of Solids & Structures, 1989, 25(3):299-326.

[13] Jeeho Lee and Gregory L. Fenves. Plastic-Damage Model for Cyclic Loading of Concrete Structures[J]. Journal of Engineering Mechanics, 1998, 124(8):892-900.

[14] Ministry of Housing and Urban-Rural Development of the People 's Republic of China. Code for Design of Concrete Structures: GB 50010-2010 [S]. Beijing: China Building Industry Press, 2015.

[15] Sidoroff F. Description of Anisotropic Damage Application to Elasticity [M] // Physical Non-Linearities in Structural Analysis.Springer Berlin Heidelberg, 1981: 237-244.

[16] Zhang jin, Wang Qingyang, Hu Shouying, et al. Parameter verification of ABAQUS concrete damage plasticity model [J].Building structure, 2008 ( 08 ) : 127-130.

[17] Najar J. Continuous Damage of Brittle Solids [M].Continuum Damage Mechanics Theory and Application. Springer Vienna,1987: 233―294.

[18] Zhao Yachun. Study on bearing behavior of large-diameter cast-in-place piles for bridges considering scour and material deterioration [D]. Zhengzhou : Zhongyuan University of Technology, 2023

[19] Guo Jinjun, Han Juhong, Lu Yan. Mechanical properties of modified concrete in mixed corrosion environment [J].Journal of Building Materials, 2013,16 ( 02 ) : 330-334.

[20] China Academy of Building Research.Technical specification for detection of building foundation piles : JGJ 106-2014 [S].Beijing : China Construction Industry Press, 2014.

[21] Ministry of Housing and Urban-Rural Development of the People 's Republic of China. Technical Code for Building Pile Foundation ( JGJ94-2008 ) [S]. Beijing : China Construction Industry Press, 2008.