空腹桁架亦称连框桁架。我厂从1963年以来,在起重机桥架上采用此种结构代替传统的构架式桁架,不仅减轻了桥架自重,增大了桥架的刚性,而且外形美观,用户感到满意。对于空腹桁架的强度计算,曾经有过相当多的文献。但是有的过于简化,不易准确;有的又过于繁琐,难于进行大量的计算。笔者认为以蔡方荫先生的“不均衡力矩传播法”和“无剪力分配法”相结合,能获得最简便又精确的答案。对于空腹桁架的挠度也同样需要仔 Fasting truss also known as frame truss. Since 1963, our factory adopts this kind of structure instead of the traditional truss truss on the crane bridge, which not only lightens the weight of the bridge, but also increases the rigidity of the bridge, and the appearance is beautiful and the user is satisfied. There have been quite a number of articles on the strength calculation of fasting truss. However, some are too simplistic and not easy to be accurate; others are too cumbersome to carry out a large number of calculations. The author believes that with Mr. Cai Fangyin’s “unbalanced moment propagation method” and “no-shear distribution method” combined, can get the most simple and accurate answer. The same applies to the Deflection of Fasting Trusses