正交L形多层砌体房屋在现有建筑中占有相当的比例。一般认为,这类结构的第二级鉴定应采用规范方法进行墙体承载力的验算,《建筑抗震鉴定标准》(GB50023—2009)中的面积率简化方法不再适合。对此类结构的第二级鉴定方法进行了研究,提出了多种计算方法,比较了不同方法间的差异,对面积率简化方法进行了改进,给出了适于手算的面积率简化计算方法。 Orthogonal L-shaped multi-story masonry houses occupy a considerable proportion of the existing buildings. It is generally believed that the second-level appraisal of such structures should adopt the standard method to check the bearing capacity of the wall, and the area ratio simplification method in “Seismic Evaluation Standards for Buildings” (GB50023-2009) is no longer suitable. The second-level appraisal method of this kind of structure is researched, a lot of calculation methods are put forward, the differences among different methods are compared, the area ratio simplification method is improved, and the simplified area ratio calculation method.