Social contribution through technical development of improvement on seismic performance of confined masonry wall structures being popular in developing countries

本研究采用试验、分析、文献资料和现场勘察等方法，对在发展中国家十分流行的约束砌块墙体结构的抗震性能进行了研究。试验中，所有一跨一层的试件在模拟三层建筑第一层应力图的反向水平剪力和恒定竖向荷载作用下进行。试件的比例尺为1/2.5，墙体由带两个孔的粘土砖组成，周围有钢筋混凝土柱和梁。试验结果表明：1)这种结构的抗剪承载力主要受墙体间砂浆网节点的抗剪强度和柱的抗剪强度的影响；2)受剪力墙的抗剪破坏是由套筒墙(S)在SI…中的滑移引起的3)3种加固方法(在窗内插入木质层合板或钢管框架、外加钢丝网和砂浆)均能较好地改善墙体的抗剪能力和变形能力，4)带有两个侧孔的粘土砖可以模拟在三个轴向上存在差异的力学行为。通过层状砖试件的剪切加载试验，获得了砖间砂浆缝的滑移特性，并由该特性建立了砖间砂浆缝的剪切-滑移关系曲线。通过对试验和分析得到的荷载-位移关系的比较，可以看出节理面上的压应力对该结构的抗剪能力和变形能力有显著影响。较少

This study was carried out to investigate the seismic performances of confined masonry wall structures, which are very popular in developing countries, by ways of experiment, analysis, bibliography and field survey.In the experiment, all specimens formed with one-span and one-story were subjected to reversal lateral shear force and constant vertical load simulating stress diagram in the first story of three story building. The specimens with a 1/2.5 scale had a masonry wall consisted of clay bricks with two holes and surrounded by RC columns & beams. The variables were form/size/location of an opening in the wall, shear-span-ratio, depth of columns and three types of strengthening methods for the wall with an opening.The remarks of the test results were follows: 1) shear capacity of this structure effected mainly by sliding strength of mortar mesh joints between bricks and shear strength of columns, 2) walls with an opening failed in shear caused by sliding of sleeve wall (s) in the si … More de of the opening and the sliding strength related to vertical compressive stress in the sleeve-wall plane occurred by rotation of the wall structure, 3) three strengthening methods (inserting a frame made of timber lamination or steel pipes in the window opening, and jacketing with wire-mesh and mortar) showed good improvement on shear capacity and deformability, and 4) clay bricks with two lateral holes could simulate the mechanical behaviors which had difference in three axial directions.This confined masonry wall structure was analyzed by an inelastic finite element method which was developed for reinforced concrete structures. Sliding characteristics of mortar joint between bricks were obtained by shear loading tests for layered brick specimens and a shear-sliding relation curve was modeled from the characteristics. In comparison between load-drift relations obtained from the experiments and analyses, it was cleared that compressive stress on joint planes effected remarkably on the shear capacity and deformability of this structure. Less