基于等效刚度的蜂窝梁弯扭屈曲临界荷载计算方法  

CALCULATION METHOD OF FLEXURAL-TORSIONAL BUCKLING LOAD OF CASTELLATED BEAM BASED ON EQUIVALENT STIFFNESS

作　　者：储方舟 黄峥 邱冶[2] 冯若强[3] CHU Fangzhou;HUANG Zheng;QIU Ye;FENG Ruoqiang(State Grid Jiangsu Economic Research Institute, Nanjing 210008, China;College of Civil and Transportation Engineering Hohai University, Nanjing 210098, China;School of Civil Engineering, Southeast University, Nanjing 210096, China)

机构地区：[1]国网江苏省电力有限公司经济技术研究院,南京210008 [2]河海大学土木与交通学院,南京210098 [3]东南大学土木工程学院,南京210096

出　　处：《钢结构》2018年第5期39-43,共5页Steel Construction

基　　金：国家自然科学基金项目(51538002);国网江苏省电力有限公司科技项目(SGTYHT/16-JS-198)

摘　　要：蜂窝梁是在梁腹板上开有连续规则孔洞的一种钢梁,腹板开孔后对其抗侧刚度有较大的削弱,因此整体稳定性能是蜂窝梁的重要问题。基于能量法推导出实腹梁弯扭屈曲临界荷载的计算式,采用等效刚度的方法,通过等效侧向抗弯刚度、等效翘曲刚度和等效扭转刚度推导了蜂窝梁的弯扭屈曲临界荷载的计算式。其次,考虑蜂窝梁截面尺寸、跨度、开孔率和距高比的影响,采用有限元方法对圆形孔和六边形孔蜂窝梁的弯扭屈曲进行了分析,得到了蜂窝梁弯扭屈曲临界荷载的变化规律,并验证了蜂窝梁弯扭屈曲临界荷载计算式的正确性,可为蜂窝梁的整体稳定设计提供参考。Castellated beam is a type of steel beam with continuous regular holes on the web. As the lateral stiffness has been greatly weakened by the web openings,the overall stability is an important issue for castellated beams. The flexuraltorsional buckling load of solid-web girder was deduced by energy method,and the flexural-torsional buckling load of castellated beam was deduced by the equivalent lateral bending stiffness,the equivalent warping stiffness and the equivalent torsional stiffness based on the equivalent stiffness method. Considering the influence of cross-section size,span,opening ratio and distance-height ratio,the paper analyzed the flexural-torsional buckling of circular and hexagonal castellasted beams by finite element method. The change law of the flexural-torsional buckling load of castellasted beam was obtained and the flexural-torsional buckling load formula was verified,and the reference for the overall stability design of castellated beams was provided.

关 键 词：钢结构 蜂窝梁 弯扭屈曲临界荷载 

分 类 号：TU391[建筑科学—结构工程]