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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第13卷    第2期    总第71期    2016年2月

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文章编号:1672-7029(2016)02-0295-06
CFRP约束局部强度不足桥墩轴心受压力学性能分析
李健康1,刘敦文1,王培森2,曾水生2,冯宝俊1

(1.中南大学资源与安全工程学院,湖南长沙 410083;
2.中交一公局第二工程有限公司,江苏苏州 215101
)

摘 要: 为分析碳纤维增强复合材料(CFRP)约束局部强度不足桥墩的加固效果,探讨CFRP约束状态下桥墩的受力机理,采用有限元法对CFRP约束局部强度不足桥墩的轴心受压性能进行分析。根据某复建工程桥梁病害特征及成因机理,选取3组12个CFRP约束局部强度不足桥墩进行有限元分析,研究CFRP加固量、新老混凝土结合面位置的变化对局部强度不足桥墩承载力、CFRP拉应力、核心混凝土力学性能的影响;将有限元计算的极限承载力与理论计算结果进行比较,以此证明有限元模型的合理性。研究结果表明:由于CFRP的约束作用,加固后桥墩承载力和延性得到改善;新老混凝土结合面位置的变化对CFRP应变的竖向分布影响显著;增加CFRP加固量,使得核心混凝土侧向约束应力明显增大。

 

关键字: 桥墩加固;轴压性能;有限元分析; CFRP;强度不足

Axial compressive performance analysis on CFRP wrapped pier withpartial deteriorated strength
LI Jiankang1, LIU Dunwen2, WANG Peisen2, ZENG Shuisheng2, FENG Baojun1

1. School of Resources & Safety Engineering, Central South University, Changsha 410083, China;
2. No.2 Engineering Co., Ltd of cccc First Highway Enginneering Burear, Suzhou 215101, China

Abstract:In order to analyze the reinforcement effect of pier wrapped up carbon fiber reinforced polymer (CFRP) and explore the stress mechanism of CFRP wrapped pier under the constraint condition, this paper took the finite element method to simulate and reveal the axial compression performance of wrapped bridge pier. According to the distress characteristics and genetic mechanism of reconstruction bridge pier, 3 groups of 12 bridge piers were selected as the major specimens to undertake numerical simulation by considering of four determiners, which include the reinforcement quantity of CFRP, the different combination surface location on the strength insufficient parts, the bearing capacity of CFRP tensile stress, the mechanical properties of the core concrete. Based on the model and considering the boundary and assumed conditions, the calculating process was conducted for the rebuilt wrapped bridge piers. The results show that the bearing capacity of piers is significantly improved because of restriction of CFRP. Distribution of CFRP stress is affected notably by the combination of old and new concrete surface position, and the core concrete lateral restraint stress is considerably improved according to the growing amount of CFRP assistance.

 

Key words: pier reinforcement; axial compression; finite element analysis; CFRP; insufficient strength

ISSN 1672-7029
CN 43-1423/U

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