分段SFC预制壳壁抗震加固RC墩柱的效能研究

针对国内外强震作用下钢筋混凝土桥梁RC桥墩震损普遍存在的问题,在消化和吸收国内外已有RC墩柱抗震加固成果的基础上,研制开发一种了新型RC墩柱抗震加固措施-RC墩柱塑性铰区域外包分段钢纤维混凝土(Steel Fiber Concrete,SFC)预制壳壁,选取实际桥梁中的RC桥墩为原型,通过加固前后模型RC桥墩伪静力对比试验研究,校验这种新型RC墩柱抗震加固措施的有效性,试验结果表明新型RC墩柱抗震加固措施能在不改变RC桥墩塑性铰位置的前提下实现承载力和耗能能力的提高。此外,选取不同场地条件下的典型地震动,进行实验RC墩柱加固前后的非线性地震时程反应对比分析,进一步验证新型抗震加固措施的加固效能。

Research on efficiency of RC piers seismic strengthened by Precast SFC shell Segments

In this paper, to solve the problem that the seismic damage of reinforced concrete bridges’ RC piers under strong earthquake is often encountered at home and abroad. On the basis of the results of existing piers/columns seismic strengthening in the domestic and foreign, a new-type RC piers/columns seismic strengthening measures-Precast SFC shell segments wrap the plastic hinge region of RC piers/columns, which is developed. Then, the RC piers in the actual bridge was selected as a prototype, The validity of this RC piers/columns seismic strengthening measures is studied by comparative experimental study of the RC piers and the strengthened RC piers in the pseudo static tests, the experimental results showed the RC/columns pier seismic strengthening measures can enhance the bearing capacity and energy dissipation capacity of RC piers without changing their plastic hinge position. In additional, the nonlinear seismic time history response of the experimental RC piers reinforcement was analyzed and compared under the typical ground motion in different site conditions, which further verified the effectiveness of the new-type seismic strengthening measures.