甘肃武都典型夯土民房承重墙体抗剪强度试验研究

Experimental Study on Shearing Strength of Typical Rammed Earth Wall in Wudu Area,Gansu Province

武都是甘肃省典型夯土民房使用地区。试验中使用武都当地常用土料,完全按照当地施工工艺夯筑两片夯土墙体试件,利用伪静力方法研究墙体抗剪强度。结果显示:(1)上覆荷载对夯土墙体的水平承载力和变形影响较大,随着上覆荷载从10kN增加到18kN,开裂荷载和极限荷载分别增加了217%和359%,极限顶点位移则降低了30%;(2)在水平往复荷载的作用下,夯土墙体始终沿着夯土层间水平和垂直接触裂缝处产生破坏,最终碎裂成块体。最后提出了使用铁丝网来加固现存夯土民房承重墙体的建议。

Wudu is the area where using typical rammed earth rural houses in Gansu province.In experiments two wall specimens are built using local material and local construction technology,and the shearing strength of wall is investegated by pseudo-static test,the results show（1） the overlying load on the wall has greater effect on horizontal load capacity and deformation of the wall,with the overlying load from 10 kN to 18 kN,cracking load and ultimate load increased by 217% and 359%,ultimate top displacement is reduced by 30%;（2） the rammed earth wall is always destroyed along the horizontal and vertical contacts between layers,and eventually is fragmented into blocks with the role of horizontal cyclic loading.At last,this paper recommend to reinforce the rammed earth bearing wall of the existing rural houses with iron mesh.