Research on reinforcing method for masonry buildings in developing countries with high seismic activity

为了提高发展中国家砌体房屋的抗震安全性，对拉美国家普遍采用的约束砌体墙体系进行了抗震性能改善试验研究。本文的主要研究成果如下：1.受弯破坏的约束砌体墙的抗震性能1）砌体墙与约束柱之间设置的连接筋和水平墙筋对墙体的抗弯承载力影响不大。然而，在这方面，2）现有的配筋砌体墙的抗弯承载力计算方法可用于预测配筋砌体墙的抗弯承载力; 2.双向水平荷载作用下横墙约束砌体墙的抗震性能1）钢筋混凝土约束柱对墙体的抗剪承载力有积极的影响横向水平荷载降低了墙体的平面内水平承载力横向水平荷载作用下，墙体的延性没有降低。3.水平配筋对墙体抗剪强度和变形能力的影响1）水平配筋对墙体的抗剪强度有积极的影响; 2）水平配筋对墙体的变形能力有一定的改善作用; 3）水平配筋数量对墙体的抗剪强度和变形能力影响不大。

In order to improve seismic safety of the masonry buildings in the developing countries, an experimental research for improving seismic performance of the confined masonry wall system, which is widely accepted in masonry buildings in Latin American countries, was carried out. Results of the research are summarized as follows.1.Seismic performance of confined masonry wall failed in flexure1)Connection bar, which is installed between brick masonry wall and R/C confining column, and horizontal wall reinforcing bar are not effective for the flexural strength of the wall. However, both of them are effective for the ductility especially in the wall subjected to lower vertical axial load.2)Ultimate flexural strength of the wall can be predicted by an existing method for the reinforced masonry walls.2.Seismic performance of confined masonry wall with transverse walls subjected to horizontal forces in two directions1)Connection bar and horizontal wall reinforcing bar restrain growth of the vertical cracks formed at wall connections.2)R/C confining column gives positive effect on shear strength of the wall.3)Connection bar and horizontal wall reinforcing bar are effective for the ductility of the wall.4)In-plane horizontal load carrying capacity of the wall is decreased by transverse horizontal loading.5)Ductility of the wall is not decreased by transverse horizontal loading.3.Effect of horizontal wall reinforcing bar on shear strength and deformation capacity of the wall1)Horizontal wall reinforcing bar gives positive effect on shear strength of the wall.2)Deformation capacity of the wall is improved if the horizontal reinforcing bars are installed in the masonry wall.3)However, clear differences due to the amount of horizontal reinforcing bars were not observed in shear strength and deformation capacity of the wall.