一、问题的由来我院在某工程中学习兄弟单位先进经验曾经设计了“桁架式组合吊车梁”来代替过去惯用的 T 型实腹吊车梁,混凝土及自重均可降低一半以上,在结构改革中取得一定成效。但是由于计算疏忽发生差错,此按过去认为正确计算所得的 First, the origin of the problem Our hospital in a project to learn advanced experience of fraternal units Have designed a “truss combination crane beam” instead of the usual conventional T-shaped crane beam, concrete and self-weight can be reduced by more than half in the structural reform Achieved some success. However, due to errors in the calculation of negligence, according to the past that the correct calculation of the proceeds