钢-混凝土组合式屋架,不同于一般标准图集的组合式屋架。其上弦及压腹杆采用钢筋混凝土材料,下弦及拉腹杆采用型钢,该屋架已在几个项目中使用,効果良好。此种形式屋架不宜用静定的近似法分析,采用力法方程,以矩阵形式进行计算,并列出上弦杆内力及形常数和载常数的计算式,以期合理设计钢-混凝土组合屋架,达到经济和安全的目的。实践证明该方法是可行的,其內力分析所需数据均已具备,可方便设计者计算。 Steel - concrete modular roof truss, different from the standard set of standard composite roof truss. Its winding and compression rod using reinforced concrete material, the lower chord and pull the web with steel beam, the roof truss has been used in several projects, the effect is good. This form of roof truss should not be analyzed by static approximation, using force method, matrix calculation, and lists the winding rod internal force and the formula for calculating the constants and load constants, in order to rationally design steel - concrete composite truss, to achieve Economic and security purposes. Practice has proved that the method is feasible, the data required for its internal force analysis are available, can be easily calculated by the designer.