侧向支承作用下简支钢梁整体稳定性研究  

Study on Overall Stability of Simply supported I-section Steel Beam With Two Lateral Bracing for its Compression Flange

作　　者：刘小培 师先银 

机构地区：[1]中粮工程科技(郑州)有限公司,郑州450053

出　　处：《粮食流通技术》2014年第4期12-18,共7页Grain Distribution Technology

摘　　要：本文对简支工形钢梁受压翼缘有两道侧向支承时的整体稳定性能进行了系统研究。首先根据能量法原理,把中梁段单独取出来,推导了3种不同荷载类型作用下钢梁整体稳定临界弯矩;其次介绍了Nethercot和Trahair建议的考虑梁段相互约束效应的计算方法(简称"NT法")。采用ANSYS有限元分析软件,对总跨度为15 m的简支钢梁,考虑其侧向支承条件、截面形式、荷载类型的变化,共计算了144根钢梁,对其进行了特征值屈曲分析。然后对3种方法计算的整体稳定临界荷载进行了对比分析,通过分析对比评价了两种理论方法的计算精度和实用性。最后根据有限元分析的结果,拟合了满跨均布荷载作用、跨中集中荷载作用、支承处集中荷载作用下钢梁等效弯矩系数的计算公式。The thesis, which has a systematic study on the overall stability of dual axle symmetric I-section beam with two lateral bracing for its compression flange. First, in accordance with the energy method theory, the thesis, taking middle section into consideration independently, deduces the critical moment of girder’s overall stability under three different load types. Next, the thesis introduces the calculation method which considers mutual constraint effect of beam sections proposed by Nethercot and Trahair （hereinafter referred to as“NT method”）,The thesis, mainly adopting ANSYS finite element analysis software, carries out eigenvalue buckling analysis on 144 girders considering the lateral bracing conditions and changes of cross section shape and type of simply supported steel beam with total span 15m. carries out comparative analysis on the critical load of overall stability calculated by the three methods, through which the author evaluates the accuracy and practical applicability of the two theoretical approaches, The thesis, fits the formula for equivalent moment coefficient of girders under different load types, i.e. full cross uniformly distributed load function, midspan concentrated load and supporting place concentrated load.

关 键 词：侧向支承 特征值屈曲分析 等效弯矩系数 回归分析 

分 类 号：TU323.3[建筑科学—结构工程]