钢结构施工变形预调值及分析方法

PRE-SET CONSTRUCTION DEFORMATION VALUE AND ITS COMPUTATIONAL METHODS FOR STEEL STRUCTURES

一般情况下钢结构的设计位形只是施工的目标位形,不能作为确定构件加工和安装位形的直接依据。为保证施工的顺利进行以及竣工时结构的位形满足设计要求,施工过程中需对结构设置变形预调值。介绍了钢结构施工变形预调值的概念,构造了钢结构施工变形预调值计算的一般迭代法、正装迭代法、倒拆迭代法和分阶段综合迭代法。其中,一般迭代法可用来计算采用满堂脚手架法施工的钢结构变形预调值。正装迭代法可用来计算各种施工方法下钢结构的变形预调值,但当结构复杂杆件比较多时,分析过程中常出现算法不收敛的问题。倒拆迭代法收敛性高,但计算工作量较大。分阶段综合迭代法可以用来计算闭环复杂结构的变形预调值,克服迭代不收敛问题,其计算工作量较小。

If the structural members are fabricated and erected according to the structural design configuration （SDC） during the construction process of steel structures, it may lead to a considerable deviation between the structural construction-completed configuration and the SDC. Therefore it is necessary to take pre-set deformation values （PDV） for the structural members during the construction process. It will be focused on three computational procedures for determining pre-set deformation values of the structural members, namely, forward iteration method, backward iteration method and stepped comprehensive iteration method. Their advantages and disadvantages are pointed out where different construction approaches are employed. Numerical studies and engineering applications are given for different structural forms.