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一、前言 鉴于我国对有限元法的研究和电子计算技术的发展,如果用电子计算机对钢筋混凝土构件或结构进行非线性全过程的内力及变形分析,这样不仅能够较为准确地得到构件或结构在破坏时的内力与变形,而且也能了解受荷全过程的内力及变形,从而为简化计算提供依据。为此,结合我们在钢筋混凝土屋架次应力对承载能力影响的研究中,考感到拉、压杆为屋架的基本元件,其非线性性能又是屋架非线性全过程分析的基础,因
I. INTRODUCTION In view of the research on finite element method and the development of electronic computing technology in China, if the internal force and deformation analysis of the nonlinear whole process of a reinforced concrete member or structure is performed by an electronic computer, not only can the component or structure be accurately obtained. Internal forces and deformations at the time of destruction, but also the internal forces and deformations of the loaded process, which provide a basis for simplifying calculations. For this reason, combining with our research on the influence of secondary stress on the bearing capacity of reinforced concrete roof truss, we find that the tension and compression rods are the basic components of the truss, and their nonlinear properties are the basis for the analysis of the whole nonlinear process of the roof trusses.