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首页> 外文期刊>Bulletin of earthquake engineering >A seismic design method for reinforced concrete moment resisting frames using modal strength reduction factors
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A seismic design method for reinforced concrete moment resisting frames using modal strength reduction factors

机译：使用模态强度降低因子的钢筋混凝土力矩抗框架的地震设计方法

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摘要

A performance-based seismic design method for plane reinforced concrete (R/C) moment-resisting frames (MRF) is proposed. The method is a force-based seismic design one, utilizing not a single strength reduction factor as all modern codes do, but different such factors for each of the first significant modes of the frame. These modal strength reduction factors incorporate dynamic characteristics of the structure, different performance targets, and different soil types. Thus, the proposed method can automatically satisfy deformation demands at all performance levels without requiring deformation checks at the end of the design process, as it is the case with code-based design methods. Empirical expressions for those modal strength reduction factors as functions of the period, deformation/damage and soil types, which can be used directly in conjunction with the conventional elastic pseudo-acceleration design spectra with 5% damping for seismic design of R/C MRFs, are provided. These expressions have been obtained through extensive parametric studies involving non-linear dynamic analyses of 38 frames under 100 seismic motions. The method is illustrated by numerical examples which demonstrate its advantages over code-based seismic design methods.
机译：提出了一种基于平面钢筋混凝土（R / C）力矩抵抗框架（MRF）的性能的地震设计方法。该方法是基于力的地震设计，仅利用了所有现代代码的单个强度减小因子，但是对于帧的第一显着模式中的每一个的各个因素不同。这些模态强度降低因素包括结构，不同性能靶标和不同土壤类型的动态特征。因此，所提出的方法可以在设计过程结束时自动满足所有性能水平的变形需求，因为它是基于代码的设计方法的情况。这些模态强度降低因子作为期间，变形/损伤和土壤类型的经验表达，可与传统的弹性伪加速设计光谱一起使用，以5％阻尼的R / C MRF的地震设计，提供。通过广泛的参数研究获得了这些表达，涉及在100个地震运动下的38帧的非线性动态分析。该方法通过数值示例说明，其展示其优于基于码的地震设计方法的优点。

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