混凝土板墙加固砖墙轴心受压承载力试验

Experimental study on load capacity of brick walls strengthened with concrete splint under axial compression

为研究混凝土板墙加固砖墙后的墙体轴压力学性能,通过张拉螺杆对砖墙预压来模拟工程中的在役砖墙加固前承受竖向荷载并发生轴向压缩变形,进行了高宽比为0.8、1.1,轴压比为0.15、0.25、0.35共6片混凝土板墙加固砖墙的轴心受压试验.试验结果表明:在新增轴心荷载作用下,混凝土板墙加固砖墙截面新增的轴向压缩变形均匀,混凝土板墙首先被压坏,混凝土板墙加固砖墙的轴心受压承载力比未加固砖墙有明显提高.基于试验结果,引入混凝土、砖墙的强度利用系数,建立了混凝土板墙加固砖墙轴心受压承载力计算公式.

To evaluate the axial compression mechanical properties of brick walls strengthened with concrete splint,the brick walls were put on pressure by screw tension to simulate the brick wall under the vertical load and axial compression deformation after the reinforcement in the actual situation. The axial compression experiments of six walls reinforced by sandwich wall were carried out,in which the aspect ratios were set to 0. 8,and 1. 1 with the axial load ratios of 0.15,0.25 and 0.35,respectively. The results show that the axial compressive deformation of the reinforced brick walls is uniform and the concrete wall on both sides of the reinforced walls is crushed before the brick wall under the additional axial pressure,which indicates that the bearing capacity of the reinforced walls is obviously improved by the concrete wall. Based on experimental results the strength utilization coefficient of the concrete and brick walls was introduced,and calculation formula of the brick wall reinforced by concrete splint was set up for limit bearing capacity calculation under the axial compression.