海洋环境下Y形桥墩受力性能及抗震分析

MECHANICAL BEHAVIOR AND SEISMIC ANALYSIS OF Y-SHAPED PIERS IN MARINE ENVIRONMENT

本项目以沿海地区高架桥Y形桥墩为对象,采用ABAQUS程序对其在海上荷载作用下的力学行为进行模拟,并利用数值分析的方法,研究了混凝土劣化、钢筋锈蚀对城市高架桥Y形桥墩的受力性能影响的规律,目的是探讨海洋环境下城市高架桥Y形桥墩受力性能的影响因素,并给出提高其承载能力的合理化建议。结果表明:海洋环境下Y形桥墩的承载能力会随着墩身混凝土强度劣化后,Y形桥墩极限承载能力降低;Y形桥墩墩身钢筋强度锈蚀后,顺桥向随着钢筋强度锈蚀Y形桥墩极限承载能力降低,极限位移较成桥阶段下降;横桥向随着钢筋强度锈蚀Y形桥墩极限承载能力、极限位移影响并不显著;Y形桥墩的刚度退化有明显的突变点,突变之后刚度开始放缓。

The Y-shaped bridge pier model of urban viaduct is established by using finite element software ABAQUS.The numerical analysis method is used to study the influence of concrete deterioration and steel corrosion on the mechanical performance of urban viaduct Y-shaped pier.The purpose is to investigate the influencing factors of the mechanical performance of Y-shaped bridge piers in urban viaducts,and to give reasonable suggestions for improving their carrying capacity.The results show that the bearing capacity of the Y-shaped piers in the marine environment will decrease with the strength of the pier concrete,and the ultimate bearing capacity of the Y-shaped piers will decrease.After the strength of the steel bar of the Y-shaped pier is corroded,the ultimate bearing capacity of the Y-shaped pier with the strength of the steel bar decreases along the direction of the bridge,and the ultimate displacement decreases compared with the service phase;Their is no obvious effect on the limit carrying capacity and limit displacement of Y type pier when the reinforcement intensity is not obvious;The stiffness degradation of the Y-shaped pier has obvious mutation points,and the stiffness begins to slow down after the mutation.