均布荷载下腹板开孔钢梁的受弯性能研究  

BENDING BEHAVIOR OF STEEL BEAMS WITH WEB OPENINGS UNDER UNIFORMLY DISTRIBUTED LOADS

作　　者：周佳[1] 刘树林 牛犇 张翀[1] 张旭东 郭宏印 ZHOU Jia;LIU Shulin;NIU Ben;ZHANG Chong;ZHANG Xudong;GUO Hongyin(China Southwest Architectural Design and Research Institute Co.,Ltd.,Chengdu 610041,China;Guangzhou City Center Transport Project Management Center,Guangzhou 510030,China)

机构地区：[1]中国建筑西南设计研究院有限公司,成都610041 [2]广州市中心区交通项目管理中心,广州510030

出　　处：《低温建筑技术》2024年第7期124-129,共6页Low Temperature Architecture Technology

摘　　要：为研究腹板开孔钢梁的性能,文中通过建立有限元模型,分析了开孔尺寸、开孔位置和开孔数量对钢梁挠度的影响。基于Timoshenko梁挠度理论和T/CECS951—2021《隐式钢管混凝土结构技术规程》开孔梁挠度增量计算公式,给出了刚度折减系数计算方法。在弹性分析的基础上,对腹板开孔钢梁的弹塑性抗弯承载力进行分析,考虑了开孔位置、开孔数量和腹板高宽比的影响,并对比分析了实腹梁、腹板开孔梁、单面水平加劲、单面水平加劲和背面竖向贯通加劲、双面水平加劲、双面水平加劲和单侧竖向加劲一共6种情况。发现水平加劲肋对于开孔截面的抗弯承载能力具有明显的提高作用,但是当腹板高厚比较大时,设置横向加劲肋有助于提高腹板的稳定性。基于分析结果,最终给出了实用的洞口补强构造设计建议。To study the performance of steel beams with web openings,a finite element model is established to ana⁃lyze the effectiveness of hole size,hole position,and hole quantity on the deflection of the steel beam.Based on the timoshenko beam deflection theory and the T/CECS 951—2021 code for calculating the incremental deflection of perforated beams,a stiffness reduction coefficient calculation method is provided.On the basis of elastic analysis,the elastic-plastic bending bearing capacity of steel beams with web openings is analyzed,taking into account the ef⁃fects of opening positions,number of openings,and height to width ratios of the web.A comparative analysis is con⁃ducted on solid web beams,web openings,single-sided horizontal stiffeners,single-sided horizontal stiffeners,back vertical through stiffeners,double-sided horizontal stiffeners,double-sided horizontal stiffeners,and single-sided vertical stiffeners.It is found that horizontal stiffeners have a significant improvement effectiveness on the bending bearing capacity of the perforated section.When the height to thickness ratio of the web is large,setting horizontal stiffeners helps to improve the stability of the web.Based on the analysis results,practical design suggestions for the reinforcement structure of openings are provided.

关 键 词：腹板开孔钢梁 加劲肋 钢梁挠度 

分 类 号：TU391[建筑科学—结构工程]