如前所述,《砌体结构设计规范(GBJ3-88)》是根据《建筑结构设计统一标准(G B J 68-84)制定而成,与原规范《砖石结构设计规范(G B J3—73)》在计算方法上有原则性的区别。原规范采用的是单一安全系数法,其设计表达式是:KN<φ(R,a),它和旧钢筋混凝土结构设计规范的设计表达式相同。但和旧钢结构和木结构设计规范的设 As mentioned above, the Code for Design of Masonry Structures (GBJ3-88) was formulated in accordance with the “Unified Standard for Structural Design of Buildings (GBJ 68-84), and the Design Specification for Masonry Structure (GB J3-73). There is a principle difference in the calculation method. The original specification adopted a single safety factor method, and its design expression is: KN<φ(R,a), which is the same as the design expression of the old reinforced concrete structure design specification. However, design of old steel structure and wood structure design specifications