Replication Data for: Influence of Overhang Length on LTB Behavior of Compact Doubly-Symmetric Steel I-Beams

The present study pertains to elaborating on the effects of overhang lengths beyond end supports on elastic and inelastic Lateral Torsional Buckling behavior of doubly-symmetric steel I-beams. Finite element analyses were performed on compact sections to avoid the local (plate) buckling and beam distortions to interfere with the overall beam behavior. Accuracy of the numerical analyses was verified with the help of existing experimental results. Subsequent to this verification, 120 beams with five different compact I-sections, four different overhang lengths, two different unbraced span lengths and three different sweep values were analyzed. The numerical buckling moments of the beams with considerable overhangs were established to remain well below the respective estimates from AISC 360-16 formulation. The difference between the numerical and analytical values stems from the inability of the formula to reflect the lateral deflections of overhangs, i.e. predicating on full lateral restraint beyond unbraced spans. The study also indicated that flexural rigidities and moment capacities of beams increase with increasing overhang lengths. The increase in the buckling moment resistance in elastic and inelastic LTB were established to reach 11 and 16%, as the overhang to total length ratio increases from 0 to 0.30 for various sweep values.本研究聚焦于阐述端部支座外的悬臂长度对双对称钢工字梁弹性与非弹性侧向扭转屈曲（Lateral Torsional Buckling, LTB）性能的影响。为排除局部（板件）屈曲及梁体变形对整体梁受力行为的干扰，本次研究针对密实截面开展了有限元分析。通过与已有试验结果比对，验证了该数值分析方法的准确性。验证完成后，共对120根工字梁试件展开分析，涵盖5种不同密实工字形截面、4种悬臂长度、2种无侧向支撑跨度以及3种扫掠参数（sweep values）。研究结果显示，带有显著悬臂段的梁的数值屈曲力矩远低于依据AISC 360-16规范公式得到的对应估算值。二者的差值源于该规范公式无法反映悬臂段的侧向变形——其默认假设无侧向支撑跨度以外区域具备完全侧向约束。此外，研究表明梁的抗弯刚度与抗弯承载力随悬臂长度增加而提升；当悬臂长度与总长度之比从0增至0.30时，针对不同扫掠参数，弹性与非弹性LTB下的屈曲抗力矩增幅分别可达11%与16%。