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首页> 外文期刊>International journal of steel structures >Optimal Design Parameters of Stiffeners for Improving Seismic Performance of Links in EBFs
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Optimal Design Parameters of Stiffeners for Improving Seismic Performance of Links in EBFs

机译：加强筋改善联系地震性能的最佳设计参数

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摘要

In eccentrically braced frames (EBFs), the link beam is the main factor determining the behavior of this type of system. In order to enhance the ductility and delaying the web and flange buckling, the link beam is reinforced using intermediate web stiffeners to improve its performance and energy dissipation capacity. The web stiffeners spacing criteria is based on short links under pure shear, which have been applied without considering the bending effect on intermediate links. In this paper, first the effects of stiffener details and section geometry on the link behavior are investigated using finite element modeling, and then by proposing an optimization model, new spacing is proposed for stiffeners of intermediate links that is also consistent with bending distribution, and enhances the performance of intermediate links significantly. To further investigate the results of the optimization model and sensitivity analyses results, the behavior of a total of 52 short, intermediate and long links with different lengths and sections is simulated and investigated under cyclic loading based on ANSI/AISC 341-10 (Seismic provisions for structural steel buildings, Chicago, American Institute of Steel Construction, 2010) using ABAQUS. The results show that the section geometry in W-beams affects the stiffeners spacing and thereby, the behavior of intermediate and long links. According to the obtained results in short links, stiffeners spacing are very conservative and can be increased, and for intermediate links, adjusting the stiffeners spacing based on the proposed optimization model can significantly enhance the performance of the link beam.
机译：在偏心支撑帧（EBFS）中，链路光束是确定这种类型系统行为的主要因素。为了增强延展性并延迟卷筒纸和法兰屈曲，使用中间网加强器加强了连杆光束，以提高其性能和能量耗散能力。网状加强件间距标准基于纯剪切下的短链路，这已经应用于未考虑对中间链路上的弯曲效应。在本文中，首先使用有限元建模研究了加强筋细节细节和段几何形状对链路行为的影响，然后通过提出优化模型，提出了新的间距，用于中间链路的加强件，也与弯曲分布一致，显着提高中间链路的性能。为了进一步研究优化模型和敏感性分析结果，在基于ANSI / AISC 341-10（地震规定的循环加载下，模拟并研究了总长度和截面的总共52个短，中间和长链路的行为（对于结构钢建筑，芝加哥，美国钢铁建筑研究所，2010）使用Abaqus。结果表明，W光束中的几何形状会影响加强筋间距，从而影响中间和长链路的行为。根据所得的短链路的结果，加强筋间距非常保守，并且可以增加，并且对于中间链路，基于所提出的优化模型调整加强筋间距可以显着提高连杆光束的性能。

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