PBL加劲型矩形钢管混凝土轴压柱局部屈曲性能分析

张宁+刘永健+李慧

摘要：為研究开孔钢板连接件（PBL）加劲肋对矩形钢管混凝土轴压柱局部屈曲性能的影响，用能量法推导钢管屈曲系数计算公式，引入PBL和加劲肋相对刚度计算式并分析二者对屈曲模式的相互作用关系，讨论了PBL加劲型钢管的极限屈曲模式及其极限屈曲系数、最大相对宽厚比限值。结果表明：PBL加劲肋可明显改善钢管局部稳定性，钢管屈曲系数k随着PBL加劲肋刚度增加而增大，直至达到极限屈曲系数42.68；PBL连接件可减小板件纵向屈曲的波长，而加劲肋的影响作用与之相反；设置PBL加劲肋后，钢管的最大相对宽厚比限值可达184，并且板件屈曲后强度随宽厚比的变化曲线下降趋势减缓，强度值随着PBL刚度增加而逐渐提高。

关键词：PBL加劲肋；矩形钢管混凝土；局部屈曲；能量法；临界屈曲系数

中图分类号：TU375 文献标志码：A

文章编号：1673-2049（2017）02-0095-08

Abstract：In order to study the effects of PBL stiffener on the local buckling performance of rectangular concrete-filled steel tubular axial compression columns， the calculation formula for buckling coefficient of steel tube was deduced by energy method. The relative stiffness formulas of PBL and stiffener were introduced and the interactions between the two models and buckling modes were analyzed. The ultimate buckling modes and the critical buckling coefficient， the maximum relative width to thickness ratio of PBL steel tube were discussed. The results show that PBL stiffener can improve the local stability of steel tube. The buckling coefficient k increases with the increase of the stiffness of PBL rib until the ultimate buckling coefficient reaches 42.68. The PBL connector can reduce the longitudinal buckling wave length of the plate， and the effect of the stiffener rib is opposite. The maximum relative width to thickness ratio of the steel tube can reach 184 after setting PBL stiffener. The curve change trend of the plate strength with the width to thickness ratio decreases after buckling， and the strength increases gradually with the increase of PBL stiffness.

Key words：PBL stiffener rib； rectangular concrete-filled steel tube； local buckling； energy method； critical buckling coefficient

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现代物业杂志社

2020-08-09