屋架内力和变形计算需要杆件的轴向刚度和弯曲刚度。各种刚度取值的正确与否直接影响屋架内力和变形分析是否符合实际。工程中通常是在标准荷载作用下,按弹性理论进行内力与变形计算。试验与计算分析表明,用这种办法来计算屋架是有一定误差的,因为混凝土是弹、塑性材料、混凝土变形模量是随应力的 The calculation of internal force and deformation of the truss requires the axial stiffness and bending stiffness of the rod. The correctness of various stiffness values ​​directly affects whether the analysis of internal forces and deformations of the roof trusses is in line with reality. In the project, under the action of standard load, the internal force and deformation are calculated according to the elastic theory. Tests and calculations show that there are certain errors in calculating roof trusses using this method because concrete is an elastic and plastic material and the concrete deformation modulus is related to stress.