冯然++孟尚伟

摘要：为研究腹板开孔H型钢梁在纯弯荷载作用下的整体稳定性，采用翼缘和腹板刚度分离的方法，从理论上推导出带有连续正方形孔洞的H型钢梁的抗侧刚度、自由扭转刚度和翘曲刚度计算方法，得到其弯扭屈曲临界弯矩表达式。利用有限元软件ABAQUS对相同截面不同跨度的H型钢实腹梁在纯弯荷载作用下的弯扭屈曲临界弯矩进行分析，并将有限元模拟结果和规范计算结果进行对比。采用经验证的有限元模型对带有连续正方形孔洞的H型钢梁进行分析，并将有限元模拟结果与推导公式的计算结果进行对比。以现有规范为基础，推导出带有连续正方形孔洞的H型钢梁的弯扭屈曲临界弯矩实用计算公式。结果表明：连续开孔梁实用计算公式具有较高的精确度。

关键词：开孔实腹梁；整体稳定性；弯扭屈曲；临界弯矩；有限元分析

中图分类号：TU375文献标志码：A

Calculation Method for Overall Stability of Solidweb

Girder with Multiple HolesFENG Ran1，2， MENG Shangwei1

（1. School of Civil Engineering， Hefei University of Technology， Hefei 230009， Anhui， China； 2. School of

Civil and Environmental Engineering， Harbin Institute of Technology （Shenzhen）， Shenzhen 518055，

Guangdong， China）Abstract： In order to study the overall stability of Hshaped steel girder with multiple holes under pure bending load， the rigidities of flange and web were investigated separately. The design rules for lateral stiffness， warping stiffness and torsional stiffness of Hshaped steel girder with multiple square holes were derived theoretically to obtain the critical moments of flexuraltorsional buckling. Furthermore， the critical moments of flexuraltorsional buckling of Hshaped steel girder with same crosssection dimensions and different spans under pure bending load were analyzed by using the finite element software ABAQUS. The results by finite element model were compared with the results by current design code. The Hshaped steel girder with multiple square holes were analyzed by verified finite element model， and the results by finite element model were compared with the results by the derived formulae. The formulae for the critical moments of flexuraltorsional buckling of Hshaped steel girder with multiple square holes were proposed based on the current design code. The results show that the practical calculation formula of steel girder with multiple square holes has high accuracy.

Key words： solidweb girder with hole； overall stability； flexuraltorsional buckling； critical moment； finite element analysis

0引言

高層建筑中的管道通常是让其从梁下通过，这样无疑占据了大量的空间，导致楼层的高度增加。从结构设计来讲，风荷载作用下楼层高度增加10%，侧移将增加46.4%。因此，降低层高对高层建筑的设计具有极其重要的意义。腹板开孔梁可以很好地解决这个问题，并在实际工程中得到了广泛应用。目前广泛应用的开孔梁制作方法基本上分为两大类。第1类是将工字钢或H型钢的腹板按照一定的曲线切割，再经错位后焊接而成的加工方法，常见的有六边形孔、圆孔、矩形孔等[1]。……