长沙理工大学学报（自然科学版）2017，Vol.14Issue(1)：48-53,6.
两点对称加载下高性能H型钢梁整体稳定性验算
Integral stability checking calculation of high performance H-shapedsteel girder under two-point symmetrical loading
摘要
Abstract
In order to predict the timing of the occurrence of the steel girder overall instability and demonstrate the necessity of using lateral support during the loading process, the theoretical formula of the lateral-torsional buckling of the H-shaped steel girder in the elastic stage is derived by the energy approach under the condition of no lateral bracings at any 2-point symmetrical transverse loading.Combined with the finite element model to verify the formula, it is found that the relative error between theoretical values and numerical values is less than 3.5%, which indicates that the formula has a high precision.This formula and the current"Design code for steel structures"(GB500017-2003) are conducted to calculate the critical moment for high performance H-shaped girders, whose nominal yield strength are respectively 460 MPa, 550 MPa, 690 MPa.The calculation results show that when two symmetrical loading is carried out, without any lateral bracings in the middle span, overall instability phenomenon of the three kinds of steel girder will appear in the elastic-plastic stage and the critical moment is about 0.75 times of the ultimate moment.It is recommended to use the lateral bracings on the steel girder to carry out the constraint, which is expected to achieve the ultimate flexural strength.关键词
高性能H型钢/整体稳定性/临界弯矩/侧向支撑/极限抗弯强度Key words
high performance H-shaped steel/overall stability/critical moment/lateral bracings/ultimate flexural strength分类
建筑与水利引用本文复制引用
彭建新,郑智恒,肖林发..两点对称加载下高性能H型钢梁整体稳定性验算[J].长沙理工大学学报（自然科学版）,2017,14(1):48-53,6.基金项目
"973"国家重点基础研究发展计划项目(2015CB057701) （2015CB057701）
国家自然科学基金资助项目(51378081) （51378081）
湖南省教育厅优秀青年项目(15B015) （15B015）
