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(一)钢筋混凝土屋架次弯矩的研究概况在钢筋混凝土屋架的设计中,早先像普通钢屋架一样是不考虑由于节点刚性引起的弯矩的。但钢筋混凝土屋架实质上不同于钢屋架,因为在钢筋混凝土屋架中杆件的刚度以及节点的刚性均较钢屋架为大,所以其次弯矩亦较大。随着钢筋混凝土屋架在我国及其他国家如苏联的广泛采用,屋架设计的不断发展与完善,以及某些钢筋混凝土屋架工程质量问题的发生,近20年来这问题已渐渐被引起注意。
(I) Overview of research on secondary bending moments of reinforced concrete roof frames In the design of reinforced concrete roof trusses, bending moments due to the stiffness of the joints were not taken into consideration earlier, like ordinary steel roof trusses. However, reinforced concrete roof trusses are substantially different from steel roof trusses because the rigidity of the rod members and the rigidity of the joints in the reinforced concrete roof truss are larger than those of the steel truss, so the second bending moment is also large. With the widespread adoption of reinforced concrete roof truss in China and other countries such as the Soviet Union, the continuous development and improvement of roof truss design, and the quality of certain reinforced concrete roof trusses, this issue has gradually attracted attention in the past 20 years.