H型钢压杆腹板宽厚比限值  

The Limiting Width-to-Thickness Ratio for Web of H-Columns

作　　者：童根树[1] Genshu Tong(Institute of High Performance Structures,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学高性能结构研究所,杭州310058

出　　处：《钢结构（中英文）》2023年第9期53-55,共3页Steel Construction（Chinese & English）

摘　　要：介绍了GB 50017-2017《钢结构设计标准》中腹板宽厚比限值可能存在的问题,利用整体弯曲失稳时柱中截面的应力梯度计算腹板的局部屈曲临界应力,采用这个临界应力计算局部屈曲的正则化宽厚比。利用美国AISI规范和欧洲板结构规范EC3-1-5的板件有效截面公式中全截面有效的正则化宽厚比求得腹板的宽厚比限值。结果发现:宽厚比限值公式应与压杆的正则化长细比联系。基于此拟合了公式,并与当前规范公式进行了对比。由于该方法考虑了整体弯曲屈曲对腹板局部屈曲的影响,理论上更加合理。A brief introduction on the limiting width-to-thickness ratio of web of GB 50017—2017 is presented for axially loaded H-column,and possible problems are pointed out.The edge yielding criteria is used to approximate the overall instability of the column and to determine the web stresses at this state to compute the local buckling stress of the web and the corresponding normalized width-to-thickness ratio of the web.Based on the effective width formulas of plates in AISI and European codes EC3-1-5,the limiting width-to-thickness ratio of the web at which the full width is effective is obtained.The results revealed that the limiting ratio shall be related to the normalized slenderness of column.Comparison with the current code formula is given.Approximate formulas are proposed.The presented method is more rational because it considers the effect of overall bending on the web stress distribution and local buckling.

关 键 词：宽厚比限值 腹板 压杆 屈曲 

分 类 号：TU391[建筑科学—结构工程]