双层有吊车厂房框架的弹性屈曲

Elastic Buckling of A Two-Story Mill Frame with Crane Loads

将单跨有吊车厂房模拟成单跨两层框架,中间框架梁两端铰接,模拟吊车桥架的联系作用,对其弹性屈曲进行了分析。分析发现,此时层与层的相互作用导致的同一层每个柱子的临界荷载的增加或者减小具有相同的比例。借助此规律,利用合并解法对框架进行了屈曲分析,发现合并解法具有很高的精度,这说明同层各柱是作为一个整体参与层与层之间的相互作用的,同时还说明梁的左、右两端提供给左、右柱子的约束可能不同,但是总和是不变的。

A portal frame with overhead cranes is modeled as a one span two-story frame in buckling analysis, where the story beams are of hinge connection with columns to simulate the bridging effect of the crane. It is revealed that the buckling loads modifications of columns in the same story, due to the inter story interactions, are in an identical percentage. Based on this point, a so called combined method is employed in buckling analysis of the frame, which indicates thai this combined method is of good accuracy and the columns in the same story are all contributing to the inter story interaction. The results of this study also show that the total constraints from the beams to the columns at their ends are identical, although the respective constraints to their different ends may not be the same.