摘要
采用开口薄壁构件理论,根据上翼缘侧移受约束的简支檩条在风吸力作用下发生弯扭屈曲的总势能,应用Ritz法得到了无支撑冷弯C形和Z形檩条在线性弯矩下和两跨连续檩条均布荷载下的临界荷载计算式,并与采用了刚周边假定的ANSYS板壳元的分析结果进行了校正。最后与采用ANSYS板壳单元建模的、放弃了截面刚周边假定的分析结果进行对比,对临界荷载计算式进行修正,提出了与ANSYS分析结果符合很好的计算式。
Based on the theory of thin-wall members with openings and the total potential energy of flexural-torsional buckling of simple purlins with restrained upper flanges under wind suction,the equations for the critical loads of the simply supported purlins under linear moment and two-span continuous purlins under uniform loads were obtained by Ritz method.The results were calibrated with analytical results that were obtained by shell elements with rigid profile assumption of ANSYS.Finally,the obtained equations were further improved by comparing with the results of ANSYS without the rigid profile assumption.The obtained formula for critical loads was amended and found to be in excellent agreement with the analytical results of ANSYS.
出处
《钢结构》
北大核心
2015年第10期9-17,共9页
Steel Construction
关键词
檩条
屈曲
临界荷载
势能
purlin
buckling
critical load
potential energy
