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首页> 外文期刊>Bulletin of earthquake engineering >A direct displacement-based seismic design method using a MDOF equivalent system: application to R/C framed structures
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A direct displacement-based seismic design method using a MDOF equivalent system: application to R/C framed structures

机译：基于直接位移的地震设计方法，使用MDOF等效系统：应用于R / C框架结构

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摘要

An improved version of the direct displacement-based design (DDBD) method for the seismic design of plane moment resisting frames in the framework of performance-based design approach is presented. The method employs a multi-degree-of-freedom equivalent system instead of the single-degree-of-freedom equivalent system used by the conventional DDBD method. Thus, the proposed method can take more rationally and with higher accuracy into account the higher mode and P-Delta effects than the conventional one. This is accomplished with the aid of the concept of deformation dependent equivalent modal damping ratios previously developed by the present authors for other purposes and the concept of the design modal displacements developed herein. These design modal displacements are determined on the basis of target inter-storey drift ratios for every performance level and the first few modes significantly contributing to the structural response. Thus, one can determine from the displacement spectrum with high amounts of viscous damping the required modal periods for known values of the design modal displacements. From those modal periods, the corresponding required modal stiffness and hence the modal base shear forces can be obtained. The final required design base shear can be obtained by a combination rule, like the SRSS rule. Numerical examples involving the seismic design of two moment resisting reinforced concrete plane frames are presented in detail for illustrating the proposed approach and demonstrating its merits over the conventional DDBD method and the force-based design method of Eurocode 8.
机译：提出了一种改进的基于位移的基于位移的设计（DDBD）方法，用于基于性能的设计方法框架中的平面力矩抵抗框架的地震设计。该方法采用多程度自由度等效系统，而不是传统DDBD方法使用的自由度等效系统。因此，所提出的方法可以更合理地采用更高的准确性，以考虑比传统的更高模式和p-Δ效应。这是借助于以前由本作者开发的变形相关的等效模态阻尼比的概念来实现，以用于其他目的，以及本文开发的设计模态位移的概念。这些设计模态位移是基于目标层间漂移比的基础上确定每个性能水平，并且前几种模式显着贡献结构响应。因此，可以从位移光谱确定高量粘性阻尼的用于设计模态位移的已知值所需的模态周期。从那些模态时段，可以获得相应的所需模态刚度，因此可以获得模态剪切力。最终所需的设计基础剪切可以通过组合规则获得，如SRSS规则。详细介绍了涉及两时抗钢筋混凝土平面帧的地震设计的数值示例，用于说明所提出的方法，并通过传统的DDBD方法和欧古代码8的力的设计方法证明其优点。

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