【摘要】 本文依据钢筋混凝土、予应力混凝土屋架静载试验,研究屋架的受力性能,屋架的受荷破坏形态、屋架的荷载—挠度曲线以及屋架各杆件的轴力刚度和弯曲刚度。文中分析了:屋架上弦的剪切力作用,影响上弦的受压强度,初步提供有关计算公式;予应力混凝土屋架在强度设计的极限状态,有相当数量的次内力,不宜忽略;屋架在强度极限状态时各杆件的刚度与弹性刚度不同,特别是对压弦刚度,提出简单适用的计算公式。本文为屋架强度次内力分析,提出计算原则及简单实用的挠度分析方法——“似梁法”。更多还原

【Abstract】 This article deals with the Elasto-Plastic behaviours of reinforced and prestressed concrete trusses on the basis of statical loading tests。 Where the Stress Performances,breaking forms,load-flexibility curves and axial or bending rigidities of each member are all com- prised。 In this article,It is found that the shearing stress of upper chord, do affects its compression strength thus,a preliminary relevant calcula- ting formula is provided It is also analysed that in the ultimate streng- th state of prestressedo trusses,the magnitudes of secondary internaI for- ces are so large that they should not be neglected.It is also found that the rigidity of each member of truss in ultimate strength state is diffe- rent from its elastic rigidity,especially for the compressive rigidity of upper chord,and thus the authors provide a rather simple and applicable calculating formula. For analysing secondary-internaI forces of the truss,the authors suggest a calculating criterion and a practicable simple method which may be called as-“beam analogy method”更多还原