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首页> 外文期刊>Bulletin of earthquake engineering >Applicability of the direct displacement-based design method to steel moment resisting frames with setbacks
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Applicability of the direct displacement-based design method to steel moment resisting frames with setbacks

机译：基于直接位移的设计方法对有挫折的抗弯钢框架的适用性

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While quite extensive research has been undertaken during the last decades to extend the direct displacement-based design (DDBD) method to a wide range of structural types and materials, it is recognized that there are still some areas requiring further study and development. Steel structures and, more specifically, steel moment resisting frames with setbacks are one of these and, therefore, this work aims to investigate the seismic response of such structures designed according to the DDBD procedure currently prescribed for regular frames and to elaborate specific recommendations based on the results obtained. The main aspects to be considered are the adequacy of the displacement profile and higher mode reduction factor to be used, as well as the suitable strength distribution required. In a trial application of the current DDBD procedure, two two-dimensional 12-storey frames with setbacks are designed, and the solutions obtained are used to develop models of the structures, which are then subject to a series of non-linear time-history analyses at increasing levels of intensity, using spectrum-compatible scaled accelerograms. The results obtained are contrasted with those of Karavasilis et al. (J Constr Steel Res 64:644-654, 2008), which were developed for steel frames designed via code methods. It is recognized that the DDBD method can benefit from the expressions developed by these authors, and recommendations for the adjustment of the DDBD higher mode reduction factors are subsequently proposed. The efficacy of the latter is evaluated by the design and verification at a range of diverse intensities of a set of two-dimensional frames of 6, 9 and 12 storeys, and satisfactory outcomes are obtained. These results have been fundamental in revealing the need for future research regarding the influence of the design spectral shapes, ductility demand and P-Delta instability in the dynamic amplification of drifts due to higher mode effects.
机译：在过去的几十年中，尽管进行了相当广泛的研究，以将基于位移的直接设计（DDBD）方法扩展到广泛的结构类型和材料，但人们认识到，仍有一些领域需要进一步研究和开发。钢结构，更具体地说是具有挫折的钢制抗弯框架就是其中之一，因此，本工作旨在调查根据目前为常规框架规定的DDBD程序设计的此类结构的抗震性能，并根据以下内容制定具体建议：获得的结果。要考虑的主要方面是要使用的位移分布图和较高的模态降低因子，以及所需的合适强度分布。在当前DDBD程序的试用应用中，设计了两个带有挫折的二维12层框架，并将获得的解用于开发结构模型，然后对它们进行一系列非线性时间历史处理使用频谱兼容的比例加速图以更高的强度进行分析。所得结果与Karavasilis等人的结果进行了对比。 （J Constr Steel Res 64：644-654，2008），这是为通过编码方法设计的钢框架而开发的。公认的是，DDBD方法可以从这些作者开发的表达式中受益，随后提出了调整DDBD高模降低因子的建议。通过设计和验证，可以在一组6层，9层和12层的二维框架的不同强度范围内评估后者的功效，并获得令人满意的结果。这些结果对于揭示未来需要进行的研究具有根本意义，这些研究涉及设计频谱形状，延展性需求和P-Delta不稳定性在因高模效应引起的动态放大中的影响。

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