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基于地震作用下砌体结构墙体通常由于受剪能力不足而发生破坏的特点,提出了体外预应力对砌体结构进行抗震加固的方法,即在墙体两侧埋设并张拉预应力筋,使墙体在交角处和主要受力段受到预压力,以提高墙体的抗剪强度,改善砌体结构的抗震性能。为了验证该方法的有效性,制作了2个1∶4整体模型,其中1个模型采用体外预应力法加固,进行了模拟地震振动台模型对比试验。试验结果表明:采用体外预应力法对砌体结构墙体施加竖向整体预应力,可以提高墙体的抗剪、抗弯强度,改善墙体的延性和耗能能力,增强结构的整体性,提高结构整体刚度,且很少增加结构自重,是一种较为理想的抗震加固方法。
Based on the characteristics of the masonry walls usually damaged due to insufficient shear capacity under earthquake, a method of aseismic reinforcement of masonry structures by external prestressing is proposed, in which the prestressing tendons are embedded and tensioned on both sides of the wall, So that the wall at the corner and the main stress by the pre-pressure to improve the shear strength of the wall to improve the seismic performance of masonry structures. In order to verify the effectiveness of the method, two 1: 4 overall models were made, of which 1 model was reinforced by in-vitro prestressing method and a comparative test was conducted to simulate the shaking table model. The test results show that using external prestressing method to exert vertical prestressing force on the wall of masonry structure can improve the shear resistance and flexural strength of the wall, improve the ductility and energy dissipation capacity of the wall, enhance the structural integrity, Improve the overall stiffness of the structure, and rarely increase the weight of the structure, is a more ideal method of seismic strengthening.