普通钢筋和碳纤维筋对预制节段桥墩抗震性能的影响(英文)

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为了得到快速施工和利用新材料的预制节段桥墩设计方法,研究了部分钢筋替换为碳纤维筋时预制节段桥墩的水平承载力和破坏等级.首先通过与拟静力试验结果的比较证明了仿真分析的正确性,然后研究了部分普通钢筋替换为碳纤维筋,对拟静力循环荷载和地震地面运动分别作用时预制节段桥墩响应的影响.结果表明:碳纤维筋能提高桥墩水平承载力,增大有效刚度,降低等效粘滞阻尼比和滞回能量耗散.地震时程计算表明:部分普通钢筋替换为碳纤维筋时,使得预制节段桥墩在较强烈地震底面运动下不倒塌.利用绝对能量法分析了桥墩在地震地面运动下的能量吸收和耗散情况,并主要研究了4种桥墩试件在3种不同地震地面运动作用下的输入能量和滞回能量耗散,结果是随着桥墩输入地震能量的增大滞回能量耗散增长缓慢. In order to get the design method of prefabricated section piers for rapid construction and utilization of new materials, the horizontal bearing capacity and failure grade of prefabricated piers with partial replacement of steel bars are studied.Firstly, the simulation results are compared with the results of quasi-static tests Then, the effect of some ordinary steel bars replaced with carbon fiber reinforced bars on the responses of prefabricated piers in quasi-static cyclic loading and earthquake ground motion is studied. The results show that the carbon fiber reinforced stiffeners can increase the horizontal bearing capacity of piers, Large effective stiffness, and reduced equivalent viscous damping ratio and hysteretic energy dissipation.Seismic time history calculation shows that: when replacing part of ordinary steel with carbon fiber reinforcement, prefabricated section piers do not collapse under the strong earthquake bottom surface, Energy method is used to analyze the energy absorption and dissipation of pier under earthquake ground motion. The energy dissipation and hysteretic energy dissipation of four kinds of piers under three kinds of earthquakes are mainly studied. The results show that Increase of seismic energy input into bridge piers Hysteresis energy dissipation increases slowly.
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