由于制作误差等原因,构件自重必有变异。我国早期的设计规范明确规定了结构自重超载系数;现行设计规范采用综合安全系数,其中也隐含了结构自重超载的因素;修订后的规范则将以荷载分项系数的形式考虑。为确定结构自重偏差情况,七十年代末曾对自重进行了称量调查。实测值与设计值比的平均值μ=1.06,变异系数δ=0.07。其中钢筋混凝土预制板(圆孔板和屋面板)的相应值为:μ= Due to manufacturing errors and other reasons, there must be variations in the weight of the components. China’s early design specifications clearly stipulated the overloading coefficient of the structure’s weight; the current design code adopted the comprehensive safety factor, which also implied the overloading factor of the structure; the revised specification will be considered in the form of load sub-coefficients. In order to determine the structural self-weight deviation, a weighing survey was conducted on the self-weight at the end of the 1970s. The average value of the ratio of the actual measured value to the designed value was 1.06, and the coefficient of variation was δ = 0.07. The corresponding value of reinforced concrete prefabricated panels (round hole plate and roof plate) is: μ =