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在役桥梁的混凝土桥墩往往存在着一定程度的初始损伤。以有初始弯曲损伤的混凝土中高桥墩为研究对象,根据数值分析,研究不同初始弯曲损伤程度混凝土桥墩的抗震力学性能。分析结果显示,初始损伤会降低桥墩的自振周期,减小地震侧向力,增加桥墩墩顶位移和墩底的曲率。初始损伤对钢筋应变响应的增加较为显著,可以作为损伤桥墩抗震力学性能的控制指标。由于地震力减小而位移增加,初始损伤对耗能能力的影响不确定,在较小损伤的情况下增加耗能总量,而在0.3损伤的情况下耗能减小。
Concrete piers in service tend to have some degree of initial damage. Taking the high bridge pier with initial bending damage as the research object, the seismic performance of the concrete pier with different initial bending damage degree is studied based on numerical analysis. The analysis results show that the initial damage reduces the natural vibration period of the piers, decreases the seismic lateral force, increases the displacement of pier piers and the curvature of pier bottom. The initial damage increases the strain response of the reinforcement significantly, which can be used as the control index of the seismic performance of the pier. As the seismic force decreases and the displacement increases, the initial damage has an indefinite effect on the energy dissipation capacity, increasing the total energy consumption in the case of smaller damage and reducing the energy consumption in the case of a 0.3 damage.