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土木工程学报9卷3期中,余宗明同志提出,分析具有相当刚性的屋架上弦,一般按刚性支座连梁求弯矩及按理想铰接桁架求轴力,迭加上述二内力而设计桁架上弦,会导致相当大的误差。这结论是正确的。今就桁架次应力的计算作如下的探讨。 一、变形计算的假定 桁架次应力的产生,主要是由于各节点实际并非设计假定的理想铰按,而系刚性节点。各杆件因杆端相对变位而产生次弯矩,其相应之应力称次应
Comrade Civil Zongming proposes to analyze a fairly rigid truss headstring, which is usually based on a rigid bearing coupling beam for bending moments and an ideal hinged truss for axial force. Superimposing the above two internal forces and designing the truss top winding will result in A considerable amount of error. This conclusion is correct. Now we will discuss the calculation of stress in trusses as follows. First, the assumption of deformation calculation The secondary stress of the trusses is mainly due to the fact that each node is not the ideal hinge press designed as assumed, but is a rigid node. Each rod generates a secondary bending moment due to the relative displacement of the rod end, and the corresponding stress is called the secondary bending moment.