非对称立面砌体墙沿节点斜裂缝破坏的水平承载力计算方法

Calculation Method of Horizontal Bearing Capacity of Masonry Walls with Asymmetrical Facades Along Diagonal Cracks in Joint Area

非对称立面形状的砌体墙存在沿墙肢节点斜裂缝破坏模式,该破坏模式下的主裂缝自窗间墙与窗下墙交点斜向下方开展.定义了非对称立面砌体墙沿节点斜裂缝破坏概念,对其破坏机理进行了分析;结合试验研究及有限元模拟,提出了砌体墙沿墙肢节点斜裂缝破坏模式下的水平承载力计算方法;利用砌体墙试验数据与承载力计算结果进行了对比.研究表明:提出的水平承载力计算方法与非对称立面形状砌体墙实际破坏模式有着较好的对应性,较窗间墙斜裂缝破坏有着更为明确的物理意义;除了按现行方法进行窗间墙受剪承载力验算之外,对于非对称立面砌体墙按照沿节点斜裂缝破坏模式补充验算,以较小值作为该墙肢的水平承载力并进行抗震设计,有助于提高该类砌体墙的抗震安全储备.

For asymmetric facade shape masonry wall,there is a failure mode of inclined cracks along the nodes of the wall limbs.In this failure mode,the main crack starts from the intersection of the wall between the windows and the wall below the windows,and gradually develops and expands in an oblique downward direction.The failure concept of oblique crack along the node of asymmetric masonry wall was defined,and the generation mechanism of this failure mode was analyzed.Combined with experimental research and finite element simulation,the calculation method of horizontal bearing capacity of the wall under the failure mode of oblique cracks along the joints of the wall limbs was proposed.The actual test data of masonry walls were compared with the theoretical calculation results of bearing capacity.The research shows that the calculation method of horizontal bearing capacity proposed has a very good correspondence with the actual failure mode of asymmetric masonry wall,and has a clearer physical significance compared with the inclined crack failure of the wall between windows.For the asymmetric facade masonry wall,in addition to checking the shear bearing capacity of the wall between windows according to the existing calculation method,the supplementary checking calculation should be carried out according to the inclined crack failure mode along the node,and the smaller value is taken as the horizontal bearing capacity of the wall limb,and then the seismic design is carried out,which is helpful to improve the seismic safety reserve of this kind of masonry wall.