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首页> 外文期刊>Engineering Structures >High strength steel in chevron concentrically braced frames designed according to Eurocode 8
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High strength steel in chevron concentrically braced frames designed according to Eurocode 8

机译：人字形同心支撑框架中的高强度钢根据欧洲规范8设计

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The use of high strength (HS) steel is becoming very popular thanks to their economical and mechanical benefits. Seismic applications represent the rational field to exploit the high performance of HS steel, by means of the "dual-steel" concept that combines the HS with Mild Carbon (MC) steel in order to increase the strength of non-dissipative elements, thus enforcing a ductile overall failure mode. In this paper, a comprehensive parametric study devoted to investigate the seismic performance of EC8-compliant dual-steel chevron Concentrically Braced Frames (CBF) is presented and discussed. Both static and dynamic nonlinear analyses were carried out to investigate the seismic performance for three limit states: damage limitation (DL), severe damage (SL) and near collapse (NC). The investigated parameters cover both geometric and mechanical variables, as the type of columns, span length, number of stories and spectral shape. The analyses showed that the use of HS steel in EC8-compliant CBFs is effective to avoid the damage in the brace-intercepted beams. However, due to the flexibility of the brace intercepted beams made of HS steel, the bracing members are characterized by severe deformation demand in compression and elastic response in tension. Also, the behavior factors evaluated by means of dynamic analyses are smaller than those recommended by Eurocode 8. The comparison between dual steel CBFs with those entirely made of MC steel showed that in the second case the use of heavier profiles for braced-intercepted beams can be beneficial to reduce the brace ductility demand in compression and to activate their yielding in tension. Thereby, numerical results show that for chevron CBFs it seems more efficient to guarantee adequate stiffness than increasing the material strength for beams. On the contrary, the use of HS steel is effective for columns of the braced spans, reducing the material consumptions while providing satisfactory structural efficiency. (C) 2016 Elsevier Ltd. All rights reserved.
机译：由于其经济和机械优势，高强度（HS）钢的使用变得非常流行。地震应用通过“双钢”概念将HS与低碳碳（MC）钢结合起来，以增强非耗散元素的强度，从而成为开发HS钢高性能的合理领域。韧性的整体失效模式。本文提出并讨论了一项全面的参数研究，旨在研究符合EC8的双钢人字形V型同心支撑框架（CBF）的抗震性能。进行了静态和动态非线性分析，以研究三种极限状态的地震性能：破坏极限（DL），严重破坏（SL）和接近坍塌（NC）。研究的参数涵盖了几何和机械变量，包括柱的类型，跨度长度，层数和光谱形状。分析表明，在符合EC8的CBF中使用HS钢可以有效避免截获支撑梁的损坏。然而，由于由HS钢制成的撑杆截取梁的柔韧性，撑杆构件的特征在于对压缩的严重变形要求和对拉伸的弹性响应。而且，通过动态分析评估的行为因素要小于Eurocode 8推荐的行为因素。双钢CBF与完全由MC钢制成的CBF之间的比较表明，在第二种情况下，对支撑截取的梁使用较重的轮廓可以有利于减少压缩时支架的延展性需求并激活其在拉伸时的屈服。因此，数值结果表明，对于人字形CBF，保证足够的刚度似乎比增加梁的材料强度更有效。相反，对于跨度较大的跨度柱，使用HS钢是有效的，既减少了材料消耗，又提供了令人满意的结构效率。 （C）2016 Elsevier Ltd.保留所有权利。

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