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钢-混凝土组合梁系指在钢梁上翼缘浇注混凝土板并由剪力连接件使两者结合成一体的构件。因此,在设计中要遵守两种材料相应的规范。组合梁截面强度计算可采用塑性设计法或弹性设计法,本文采用塑性设计法,它较弹性设计法经济,计算简便,适用于不直接承受动力荷载作用下的构件计算。如火力发电厂的汽机加热器平台、锅炉运转层平台及主厂房的楼层体系,以及一般工业与民用建筑中的组合梁。为了补偿塑性设计中忽略剪力对极限弯矩的不利影响,将钢梁的设计强度降低10％。
The steel-concrete composite beam refers to a member that casts a concrete plate on a flange of a steel beam and integrates the two by a shear connector. Therefore, the corresponding specifications of the two materials must be observed in the design. The composite beam section strength can be calculated by the plastic design method or the elastic design method. In this paper, the plastic design method is adopted. It is more economical than the elastic design method and is simple to calculate. It is suitable for the calculation of components that are not directly subjected to dynamic loading. Such as thermal power plant turbine heater platform, boiler operation floor platform and the main building floor system, as well as general industrial and civil buildings in the composite beam. In order to compensate for the unfavorable influence of shear forces on the ultimate bending moment in plastic design, the design strength of the steel beam is reduced by 10%.