圆角多边形孔蜂窝梁孔间腹板屈曲承载力计算方法对比研究  

Comparison of the Web-Post Buckling Capacity of Castellated Steel Beams with Fillet Corner Hexagonal Web Openings Obtained from Different Design Methods

作　　者：李鹤[1,2] 王旭东[2,3] 张露露[2] 刘梅[2] 

机构地区：[1]山东省建筑设计研究院,济南250001 [2]山东大学土建与水利学院,济南250061 [3]保利(青岛)实业有限公司,山东青岛266000

出　　处：《建筑钢结构进展》2017年第2期38-44,59,共8页Progress in Steel Building Structures

基　　金：国家自然科学基金(51608035);山东省重点研发计划资助项目(2016GGX103014)

摘　　要：分析对比了圆角多边形孔蜂窝梁孔间腹板屈曲承载力的不同计算理论,包括楔体理论模型、英国钢结构协会计算手册理论模型、LAWSON理论模型及斜压柱模型等。采用不同理论对蜂窝梁孔间腹板的屈曲承载力进行了计算,并与试验结果进行了对比。结果表明,应用于六边形孔的楔体理论计算值过于保守,与试验值偏差均超过50%;应用于圆形孔的英国钢结构协会计算手册理论模型及LAWSON理论模型计算值也过于保守,偏差范围在58%~70%之间;斜压柱理论相比其它方法,计算结果较为准确,偏差范围在7.6%~39%之间。并采用验证的有限元方法分析了不同孔距、孔高及腹板厚度的蜂窝梁孔间腹板的屈曲承载力。应用斜压柱理论模型计算孔间腹板剪力承载力,与有限元参数分析结果对比表明,斜压柱模型按规范BS 5950-1:2000计算的理论值过于保守,理论值与有限元结果比值范围在0.185~0.384之间;按规范EN 1993-1-1计算的理论值评价孔距较小(S/d_0=1.4)蜂窝梁的剪力承载力时偏于安全,理论值与有限元结果比值范围在0.878~0.972之间,当孔距较大(S/d_0>1.4)时,理论结果偏于不安全,理论值与有限元结果比值范围在1.054~1.818之间,需要进一步修正。The web-post buckling capacity of castellated steel beams with fillet corner hexagonal web openings is studied using different analytical models. Analytical models include the wedge model, the BITAR＇s model, the LAWSON＇s model and the strut model. Web-post buckling capacities are obtained through different analytical models and compared with the test results. Results show that the wedge model provides more conservative predictions with over 50% difference as compared to test result. The BITAR＇s model and the LAWSON＇s model which are applied to the cellular steel beam also show a conservative result with a difference of 58-70% from the test result. The strut model shows a relatively accurate prediction with a difference of 7.6%-39% from the test result. A parametric study considering the opening distance, opening height and web thickness, using the finite element method, is carried out. The comparisons of the results obtained from the strut model and finite element method showed that the results are too conservative based on the BS 5950-1：2000, and the ratio of results calculated by theoretical method to those obtained by finite element method varies from 0. 185 to 0. 384. It is safe when the EN 1993-1 1 is used for the castellated steel beam with a small opening distance （S/do = 1.4）, and the ratio of results calculated by theoretical method to those obtained from finite element method varies from 0. 878 to 0. 972. However, the results are located on the unsafe side when the strut model based on the EN 1993-1-1 is used for the castellated steel beam with a larger opening distance （S/do〉l. 4）, and the ratio of results calculated by theoretical method to those obtained by finite element method varies from 1. 054 to 1. 818, indicating a further modification to the traditional strut model is needed.

关 键 词：蜂窝梁 圆角多边形孔 腹板屈曲 斜压柱模型 屈曲承载力 

分 类 号：TU392[建筑科学—结构工程]