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近几年来,新建的多层砖砌体房屋项层及女儿墙裂缝的事例时有发生。发生这种现象的原因首先应排除由于地基沉降产生的裂缝,因为如果由于沉降不均匀而产生裂缝,应当首先从底层开始,而不会仅存在于顶层和女儿墙。一、原因分析由于砖砌体的线膨胀系数和混凝土的线膨胀系数相差较大,屋面板位于女儿墙和顶层墙体之间,同一部位在较大温差情况下出现不协调变形,就会在结合面形成一定的水平推力,从而产生剪应力和拉应力。当剪应力大于邻接面上
In recent years, new cases of multi-storey brick masonry and daughter wall cracks have occurred. The reason for this phenomenon should first be to rule out cracks due to subsidence of the foundation, since if cracks are caused due to uneven subsidence, they should start at the bottom and not only at the top and the daughter’s wall. First, the analysis of the reasons As the linear expansion coefficient of brick masonry and concrete linear expansion coefficient difference between the roof and daughter board in the wall between the top wall, the same location in the case of large temperature difference appears uncoordinated, Combination of surface to form a certain level of thrust, resulting in shear stress and tensile stress. When the shear stress is greater than the adjacent surface