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在现有框架柱单侧面上增设混凝土加固截面,可使其抗震加固。该方法既可改善和提高现有结构的抗震能力,也可减小加固施工过程对原有建筑内部空间的影响。设计并进行了5个不对称单侧面加固混凝土柱的低周反复荷载试验,其中新增加固截面考虑普通混凝土和有粘结预应力混凝土两种情况,且新增截面通过锚固钢筋与现有框架柱进行连接。对比分析了加固柱的滞回曲线特性、骨架曲线、强度退化、二阶效应附加弯矩、钢筋应变,提出了不对称单侧面加固柱的抗震设计建议。试验结果表明:加固柱抗震性能得到明显改善,预应力的施加可减小原柱与新增加固截面之间的初始应力差异程度和二阶效应附加弯矩的不利影响。采用有限元软件ABAQUS对加固柱进行建模计算,并将有限元分析的骨架曲线与试验结果对比,两者符合较好。
Adding one side of the existing frame column reinforced concrete section can make it earthquake-resistant reinforcement. The method can not only improve and enhance the seismic resistance of the existing structure, but also reduce the influence of the reinforcement construction process on the original building interior space. The low-cycle cyclic loading test of five asymmetric unilaterally reinforced concrete columns is designed and carried out. The newly reinforced section considers both ordinary concrete and bonded prestressed concrete, and the new section is connected with the existing frame Column connection. The characteristics of hysteresis curve, skeleton curve, strength degradation, second-order additional bending moment and reinforcement strain are compared and analyzed. The seismic design proposal of unsymmetrical single-sided reinforced columns is proposed. The experimental results show that the seismic behavior of reinforced columns is obviously improved. The application of prestress can reduce the difference of initial stress between the original column and the newly reinforced section and the adverse effect of the second-order additional bending moment. The finite element software ABAQUS was used to model the reinforced column, and the skeleton curve of the finite element analysis was compared with the experimental results, which was in good agreement.