Stability requirements for beams in seismic steel moment frames
Stability requirements for beams in seismic steel moment frames
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DOI：
10.1061/(asce)0733-9445(2006)132:9(1334
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发表时间：
2006-09
期刊：
影响因子：
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通讯作者：
T. Okazaki;Dawei Liu;M. Nakashima;M. Engelhardt
中科院分区：
文献类型：
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作者：
T. Okazaki;Dawei Liu;M. Nakashima;M. Engelhardt
对钢框架梁在低周反复荷载作用下的受力性能进行了分析研究。在分析中明确考虑了弯扭屈曲和局部屈曲。梁的横截面尺寸是不同的，以代表广泛的轧制宽翼缘形状。梁的无支撑长度对应于弱轴的细长比在60和100之间。根据分析结果，确定了允许梁实现各种目标旋转能力的翼缘和腹板宽度-厚度限值。这些极限以极限曲线的形式表示，极限曲线描绘了翼缘宽厚比与腹板宽厚比的关系。极限曲线清楚地表明了翼缘-腹板的强烈相互作用.不同的极限曲线的范围内的目标旋转角，弱轴细长比，和剩余强度水平。研究了后屈曲行为和强度退化机理。分析的结果进行了比较，对现行建筑规范的要求，梁的稳定性，抗震钢框架，并充分评价现行规范的要求。
An analytical study was conducted on the cyclic loading behavior of beams in steel moment frames. Lateral — torsional buckling and local buckling were explicitly considered in the analysis. Beam cross-sectional dimensions were varied to represent a wide range of rolled wide flange shapes. The unbraced length of the beams corresponded to slenderness ratios about the weak axis ranging between 60 and 100. Based on the analyses, flange and web width-thickness limits were established that would permit the beam to achieve various target rotation capacities. These limits are presented in terms of limit curves which plot the flange width-thickness ratio against the web width-thickness ratio. The limit curves clearly show strong flange — web interaction. Different limit curves were developed for a range of target rotation angles, weak axis slenderness ratios, and residual strength levels. Postbuckling behavior and strength degradation mechanism were studied. The results of the analyses are compared against current building code requirements for beam stability in seismic steel moment frames, and the adequacy of the current code requirements are evaluated.