腹板加劲肋对空翼缘梁LHFB承载能力的影响  

Effect of web stiffeners on the load-carrying capacity of hollow flange beam LHFB

作　　者：刘任峰[1] 武振宇[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《哈尔滨工业大学学报》2008年第6期855-859,共5页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(50578055)

摘　　要：为改善空翼缘梁LHFB的受力性能,对LHFB设置了横向加劲肋.考虑几何非线性与材料非线性的影响,利用有限元软件ANSYS计算其在3种不同荷载作用下的承载力.研究加劲肋厚度、连接形式、加劲肋数量、端部加劲肋对LHFB承载力的影响.分析结果表明,对LHFB设置横向加劲肋,能有效的抑制空翼缘梁LHFB畸变屈曲的发生,提高构件的承载力.建议对LHFB加设横向加劲肋时,加劲肋厚度按bs/15选取,并且与翼缘和腹板全部焊接.在纯弯状态和均布荷载作用下沿梁长均匀布置两道加劲肋,在跨中集中力作用下在跨中位置布置一道加劲肋.To improve the beating capacity of the hollow flange beam LHFB, transverse web stiffeners were set. The load-carrying capacities of LHFB subjected to three different loadings were calculated by the finite element software ANSYS considering the effect of the geometrical and material nonlinearity. The effect of the thickness, the connection way with beam, the amount of stiffener and the end stiffeners on the beating capacity of LHFB was investigated. Analysis results show that the lateral distortional buckling of the hollow flange beam LHFB can be effectively restricted by the transverse web stiffeners, and the load-carrying capacity of the member is enhanced. It is proposed that web stiffeners should be welded to both beam flanges and beam web and their thickness was taken as bs/15. Two stiffeners should be uniformly set for the beam subjecting to end moments or uniformly distributed lateral load. For LHFB subjected to the concentrated force in the middle of its span, a stiffener should be placed in the position of the concentrated force.

关 键 词：空翼缘梁 横向加劲肋 畸变屈曲 抗弯承载力 

分 类 号：TU392[建筑科学—结构工程]