一、概况为了探明予应力钢筋混凝土屋架在受荷过程中的变形及受力特性,我们结合一机部汽车厂设计处的18米折线形予应力屋架的检验,对在加荷过程中各节点的位移、杆件的轴向内力及弦杆的弯矩进行了测定。屋架于1976年1月在工地浇制,7月张拉,10月下旬在浙江大学结构试验室内进行加荷试验。图1为屋架图样. I. INTRODUCTION In order to investigate the deformation and stress characteristics of prestressed reinforced concrete roof trusses during loading, we combine the inspection of the 18-meter pleat-shaped prestressed truss at the design office of a machine department, and during the loading process. The displacement of the node, the axial internal force of the rod and the bending moment of the chord were measured. The truss was cast on the construction site in January 1976 and was pulled in July. The loading test was conducted in the structural test room of Zhejiang University in late October. Figure 1 shows the truss pattern.