The reinforced concrete (RC) diaphragm damage observed during the Northridge earthquake (1994) has motivated numerous analytical and experimental studies focused on evaluating the seismic performance of this important building component. The ASCE/SEI 7-16 recently introduced an alternative methodology to determine diaphragm design forces that considered various diaphragm systems. However, this formulation was developed for typical North American structures (on frames or dual systems combined with gravity framing), which substantially differ from other worldwide common typologies that may not include gravity framing. Throughout this study, the accuracy of the existing code provisions and other alternative methods is evaluated by using three-dimensional computer models of eight symmetric-plan reinforced concrete buildings that are between five and 15 stories high and have non-gravity frames (i.e. all frames are part of the seismic force resisting system) for RC-floor systems. These models are subjected to non-linear response history analysis that considers sets of far-field records. Benchmark values, defined as the mean value of the time responses and their dispersion, are compared with the forces of design codes and procedures. General conclusions indicate that existing provisions underestimate diaphragm design forces for all the systems considered, but the results can substantially improve if a low diaphragm reduction factor is used. Alternative procedures capture the magnitude but not the height distribution. Finally, the level of non-linear behavior of the structural elements was verified; beams exhibit high inelastic response, but the overall structure and the vertical elements mostly kept elastic.

中文翻译：

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RC双系统建筑物地震膜片设计力的比较研究。

在Northridge地震（1994）期间观察到的钢筋混凝土（RC）膜片损坏已引起许多分析和实验研究，这些研究和评估专注于评估这一重要建筑构件的抗震性能。ASCE / SEI 7-16最近引入了一种替代方法来确定考虑了各种隔膜系统的隔膜设计力。但是，此公式是针对典型的北美结构（框架或具有重力框架的双重系统）开发的，这种结构与可能不包括重力框架的其他全球通用类型大不相同。在整个研究过程中，通过使用八层对称平面钢筋混凝土建筑的三维计算机模型（高度在5到15层之间，并且具有非重力框架）来评估现有法规的准确性和其他替代方法（即，所有框架都是建筑的一部分）抗震系统），用于RC地板系统。这些模型经过非线性响应历史分析，其中考虑了远场记录集。将基准值（定义为时间响应及其分散的平均值）与设计规范和过程的作用力进行比较。一般结论表明，现有规定低估了所考虑的所有系统的隔膜设计力，但如果使用较低的隔膜减小系数，则结果会大大改善。替代程序捕获幅度，但不捕获高度分布。最后，验证了结构元件的非线性行为水平；梁表现出很高的非弹性响应，但整体结构和垂直单元大多保持弹性。