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

本文采用试验、分析、查阅文献和现场调查等方法，对发展中国家普遍采用的约束砌体结构进行了抗震性能研究，试验采用单跨单层试件，模拟三层房屋第一层的应力图，在反复侧向剪力和恒定竖向荷载作用下进行。1/2.5缩尺的试件具有由粘土砖组成的具有两个孔的砌体墙，并且由RC柱和梁包围。试验变量包括墙体开孔的形式/尺寸/位置、剪跨比、柱的高度以及三种开孔墙体的加固方法。1）该结构的抗剪承载力主要受砖与砖之间砂浆网缝的抗滑强度和柱的抗剪强度的影响，2）带开口的墙由于套筒墙在裂缝中滑动而产生剪切破坏， ...更多信息 墙结构旋转产生的套筒-墙平面垂直压应力与开孔和滑动强度的关系，3）三种加固方法（在窗孔中插入由木材层压或钢管制成的框架，并用钢丝网和砂浆护套）显示出良好的抗剪能力和变形能力，采用钢筋混凝土结构弹塑性有限元法对约束砌体墙结构进行了分析。通过对砖砌体试件的剪切加载试验，获得了砖砌体间灰缝的滑动特性，并据此建立了剪切-滑动关系曲线。通过对试验和分析得到的荷载-位移关系的比较，明确了节点面压应力对该结构的抗剪承载力和变形能力有显著影响。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