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Dynamic Stability of Deep and Slender Wide-Flange Steel Columns - Full Scale Experiments

机译:深层宽阔的宽法兰钢柱的动态稳定性 - 全尺度实验

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In North America, a common design practice for steel frame buildings with perimeter steel special moment frames (SMFs) is to employ deep and slender wide-flange steel columns (i.e., range of column depth, d > 16 inches). Till recently, very little was known regarding the hysteretic behavior of such members because of lack of available experimental data. This paper discusses selective findings from a full-scale testing program that was conducted at Ecole Polytechnique Montreal with the use of a 6-degree-of-freedom experimental setup. The testing program investigated the cyclic behavior of 10 full-scale beam-columns. The specimens had a depth of 24 inches (i.e., W24×146 and W24×84 cross-sections) and were subjected under various lateral-loading protocols coupled with constant compressive axial load. The boundary conditions of the specimens simulated a fixed support at the column base and a flexible boundary at the column top end to mimic the flexibility of a beam-to-column connection at the floor level. The tested specimens represented typical interior first-story columns in mid-rise steel SMFs. This paper summarizes the main observations related to the effect of local and global slenderness ratios on the cyclic behavior of beam-columns. The effect of bidirectional lateral loading on the dynamic stability of beam-columns is also addressed. Observations related to the effect of the employed loading history as well as the lateral bracing force design requirements on steel wide-flange beam-columns are also provided based on the available experimental results.
机译:在北美,具有周边钢特殊时刻框架(SMFS)的钢框架建筑物的常见设计实践是使用深层和细长的宽法兰钢柱(即柱深度,D> 16英寸)。直到最近,由于缺乏可用的实验数据,就缺乏这些成员的滞后行为而言,很少。本文讨论了在Ecole Polytechnique Montreal在Ecole Polytechnique Montreal进行的全规模测试计划中的选择性调查结果,使用了6度自由度的实验设置。测试程序调查了10个全尺度光束列的循环行为。试样的深度为24英寸(即,W24×146和W24×84横截面),并在与恒定压缩轴向载荷耦合的各种横向加载方案下进行。标本的边界条件模拟柱底座的固定支撑件和柱顶端的柔性边界,以模拟底梁柱连接的光束到柱连接的灵活性。测试标本代表了中升钢SMF中的典型内部第一层柱。本文总结了与局部和全局细长比对梁柱循环行为有关的主要观察。还寻址了双向横向负载对光束列的动态稳定性的影响。还提供了与采用的装载历史的效果以及钢宽法兰梁柱上的横向支撑力设计要求有关的观察,也基于可用的实验结果提供。

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