CAJ | 학술논문

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。
본문대간지공형강량수압익연유량도측향지승시적정체은정성능진행료계통연구。수선근거능량법원리，파중량단단독취출래，추도료3충불동하재류형작용하강량정체은정림계만구；기차개소료Nethercot화Trahair건의적고필량단상호약속효응적계산방법（간칭“NT법”）。채용ANSYS유한원분석연건，대총과도위15 m적간지강량，고필기측향지승조건、절면형식、하재류형적변화，공계산료144근강량，대기진행료특정치굴곡분석。연후대3충방법계산적정체은정림계하재진행료대비분석，통과분석대비평개료량충이론방법적계산정도화실용성。최후근거유한원분석적결과，의합료만과균포하재작용、과중집중하재작용、지승처집중하재작용하강량등효만구계수적계산공식。
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.