摘要
针对起重机金属结构局部失稳问题,在《起重机设计规范》中引入板边弹性嵌固系数来表征翼缘板对腹板的约束作用。应用有限元分析的方法,研究纯剪切状态下腹板弹性嵌固系数的取值依据。首先进行理想四边简支板临界应力有限元计算,并与理论值比较,检验有限元模型的准确性和加载方法的正确性。然后根据实际工程数据建立工字梁和箱形梁模型,进行纯剪切屈曲分析,讨论翼缘腹板的厚度比对弹性嵌固系数的影响,提出有益于工程应用的建议。
Aiming at the problem of local instability of crane＇s metal structure,the plate elastic embedded coefficients are introduced in the Crane Design Specification,to indicate the restraint of flange plates to the web.The finite element analysis is adopted for research on the basis of value selection of web elastic embedded coefficients under the pure shear state.The finite element calculation of ideal critical stress for the quadrilateral simply-supported plate is performed firstly,and the result is compared with the theoretical value,to verify the accuracy of finite element model and correctness of loading method.Then the flanged beam and box beam models are established according to actual engineering data,for the purpose of pure shear buckling analysis.The effect of thickness ratio of flange to web on the elastic build-in factors is discussed in the paper as well,with the suggestions beneficial for the engineering applications.
出处
《起重运输机械》
2013年第4期49-53,共5页
Hoisting and Conveying Machinery
关键词
起重机
屈曲失稳
弹性嵌固系数
纯剪切
crane
buckling instability
elastic embedded coefficient
pure shear
