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Dynamic buckling of braces in concentrically braced frames

机译：同心支撑框架中支撑的动态屈曲

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Axially loaded members might experience compressive forces above their static buckling capacity because of dynamic buckling under rapid shortening. Although the subject is studied in the context of engineering mechanics, it has not been thoroughly investigated in the field of earthquake engineering. Such dynamic overshoots in the compressive capacity can also be observed for braces of concentrically braced frames (CBFs) during earthquakes. Consequently, a comprehensive investigation is conducted in this study regarding the effects of dynamic buckling of braces on the seismic behavior of steel CBFs. After providing a theoretical background, recent dynamic experiments on braces and CBFs are simulated and discussed to investigate the occurrence of dynamic overshoot during these tests. Eight archetype CBFs are then designed, modeled, and subjected to a large set of ground motions to provide a quantified insight on the frequency and anticipated level of dynamic overshoot in the compressive capacity of braces during earthquakes. Results of a total of 1600 nonlinear time history analyses revealed that dynamic overshoots occur frequently in braces and affect the behavior of CBFs notably. Considerable increases are recorded in forces transmitted to other members of CBFs as a consequence of such dynamic overshoots. Importance of incorporating these dynamic overshoots in the capacity design procedure of columns, beams, and gusset plates is highlighted. Furthermore, results of a parametric study are presented and summarized in the form of a simple formula that can be used as a guide for estimating the level of dynamic overshoot.
机译：轴向加载的构件可能会承受超过其静态屈曲能力的压缩力，这是因为在快速缩短下会发生动态屈曲。尽管在工程力学的背景下研究了该主题，但在地震工程领域尚未对其进行彻底的研究。对于地震期间同心支撑框架（CBF）的支撑，还可以观察到这种压缩能力的动态超调。因此，在这项研究中，进行了关于支撑的动态屈曲对CBF钢抗震性能的影响的综合研究。在提供了理论背景之后，对括号和CBF的最新动态实验进行了模拟和讨论，以研究这些测试过程中动态超调的发生。然后设计，建模八个原型CBF，并对其进行大范围的地面运动，以提供有关地震过程中支撑的抗压能力的动态超调的频率和预期水平的量化见解。总共1600次非线性时间历史分析的结果表明，动态超调经常发生在牙套中，并显着影响CBF的行为。由于这种动态超调，传递给CBF的其他成员的力显着增加。突出了将这些动态超调量合并到立柱，横梁和角撑板的能力设计过程中的重要性。此外，以简单公式的形式介绍和总结了参数研究的结果，可以将其用作估算动态超调水平的指南。

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