摘要
采用开口薄壁杆件理论及考虑腹板局部变形的拉条有效刚度,提出单跨跨中设置拉条的连续两跨C形冷弯薄壁檩条的弯扭屈曲的总势能;经过ANSYS的壳单元分析,从广泛的参数范围考察了檩条的屈曲模态;应用Ritz法得到风吸力作用下连续两跨C形檩条的近似临界荷载计算式,并将其临界弯矩与半跨纯弯简支檩条的临界弯矩进行比较,最终得到临界弯矩系数。
Based on the theory of thin-wall members with openings and adopting the efficient stiffness of the anti-sag bars which takes account of the effect of the local deformation of purlin web,the total potential for the lateral-torsional buckling of two-span continuous C-section purlins with one anti-sag bar at middle span section was proposed.The buckling modes were investigated in consideration of a wide range of parameters using the shell element modeling of ANSYS; the approximate formula for the critical loads of the two-span continuous purlins under wind suction was obtained by Ritz method and their critical moments were compared with those of half-span simply supported purlins under constant moment,eventually the critical moment coefficient was got.
出处
《工业建筑》
CSCD
北大核心
2017年第2期151-157,共7页
Industrial Construction
关键词
连续两跨檩条
拉条
弯扭屈曲模态
临界荷载
临界弯矩系数
two-span continuous purlin
anti-sag bar
lateral-torsional buckling mode
critical load
critical moment coefficient
