变截面压弯杆的平面外弹塑性稳定  

OUT-PLANE BUCKLING OF TAPERED BEAM-COLUMNS

作　　者：童根树[1] 李兰香[1] 

机构地区：[1]浙江大学土木工程系,杭州310058

出　　处：《工业建筑》2011年第2期83-89,共7页Industrial Construction

摘　　要：利用ANSYS软件对楔形变截面受弯构件进行弹塑性稳定分析,考虑截面塑性开展,引入通用长细比,在通用长细比中考虑楔率和弯矩线性变化的影响,拟合得到新的弯扭屈曲稳定系数公式。对于变截面压弯构件的平面外稳定,提出弯矩项带指数的光滑曲线相关公式,其中轴力项和弯矩项均取自大端的内力及其截面性质,弯矩项的指数考虑长细比和楔率的影响,将拟合公式与有限元程序结果进行对比发现,公式的精度非常好。Inelastic analysis stability is carried out for tapered beams by ANSYS,considering plasticity developemnt,introducing the universal slenderness of beams in which the taper ratio and moment ratio are considered,a new formula of stability coefficient is proposed.For the out-plane buckling of tapered beam-columns,another new formula is proposed in which axial force and moment and sectional properties are taked from the larger end of tapered members,and the moment term in the formula takes a exponent that varies with slenderness and taper ratio slightly.FEM result obtained by analysis is compared with the results calculated from the proposed formula,and the result is agreeable.

关 键 词：变截面构件 梁 压弯杆 弯扭失稳 

分 类 号：TU313[建筑科学—结构工程]