钢梁开孔影响的分析及其设计建议  

Effects of Openings on Steel Beams and its Design Suggestions

作　　者：朱群红[1] 童济 童根树[3] ZHU Qunhong;TONG Ji;TONG Genshu(Zhejiang College of Construction,Hangzhou 310000,China;The Architectural Design and Research Institute of Zhejiang University,Hangzhou 310000,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310000,China)

机构地区：[1]浙江建设职业技术学院,杭州310000 [2]浙江大学建筑设计研究院,杭州310000 [3]浙江大学建筑工程学院,杭州310000

出　　处：《工业建筑》2022年第1期90-97,共8页Industrial Construction

摘　　要：以承受均布荷载的简支梁为算例,对腹板开孔及其加劲方式对钢梁的影响进行了弹性分析。分析发现:开孔引起的挠度增量曲线符合三段直线分布规律,跨中开孔对挠度几乎没有影响;同样的开孔尺寸,当孔偏心布置时挠度增量较小,开孔段应力也较小;但开孔对腹板的局部屈曲有较大影响。经过分析,提出了适用于简支梁的挠度增量计算公式,指出未加劲的开孔部位应进行宽厚比限制,并建议高剪力区和低剪力区开孔的尺寸采用英国SCI的规定;若高剪力区开孔对开孔段强度影响较大,宜通过增设水平加劲肋使强度和局部稳定得到一定的保证。Taking the example of simply-supported beams under uniform load,the elastic analysis of the effects of web opening and stiffening method on the steel beam was conducted.The analysis revealed that:the increment of deflection due to openings was a trilinear curve,the openings at mid-span had little effect on the defection of the beam;when the openings with the same size were eccentrically positioned,the deflection increment was smaller,the stresses in the opening segments were also smaller;however,the opening had a significant effect on the local buckling of the web.After analysis,an equation for the increased deflection of simply-supported beams was proposed;the width-to-thickness ratio of the unstiffened opening should be limited.For the sizes of the openings in high-shear or low-shear segments,the British SCI regulations were introduced for reference;the openings in high-shear segment had significant effect on the strength and local buckling of the beam,it was suggested that horizontal stiffeners should be used to avoid local buckling and increase the strength.

关 键 词：钢梁 开孔 挠度 腹板稳定 

分 类 号：TU391[建筑科学—结构工程]