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Yield frequency spectra and seismic design of code-compatible RC structures: an illustrative example

机译：代码兼容的RC结构的屈服频谱和抗震设计：一个示例

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The seismic design of an eight-story reinforced concrete space frame building is undertaken using a yield frequency spectra (YFS) performance-based approach. YFS offer a visual representation of the entire range of a system's performance in terms of the mean annual frequency (MAF) of exceeding arbitrary global ductility or displacement levels versus the base shear strength. As such, the YFS framework can establish the required base shear and corresponding first-mode period to satisfy arbitrary performance objectives for any structure that may be approximated by a single-degree-of-freedom system with given yield displacement and capacity curve shape. For the eight-story case study building, deformation checking is the governing limit state. A conventional code-based design was performed using seismic intensities tied to the desired MAF for safety checking. Then, the YFS-based approach was employed to redesign the resulting structure working backwards from the desired MAF of response (rather than intensity) to estimate an appropriate value of seismic intensity for use within a typical engineering design process. For this high-seismicity and high-importance midrise building, a stiffer system with higher base shear strength was thus derived. Moreover, performance assessment via incremental dynamic analysis showed that while the code-design did not meet the required performance objective, the YFS-based redesign needed only pushover analysis results to offer a near-optimal design outcome. The rapid convergence of the method in a single design/analysis iteration emphasized its efficiency and practicability as a design aid for practical application. Copyright (c) 2017 John Wiley & Sons, Ltd.
机译：使用基于屈服频谱（YFS）性能的方法进行了八层钢筋混凝土空间框架结构的抗震设计。 YFS以超过任意全局延性或位移水平相对于基础剪切强度的年平均频率（MAF）的形式，直观地表示了系统性能的整个范围。这样，YFS框架可以建立所需的基础剪切力和相应的第一模式周期，以满足任何结构的任意性能目标，这些结构可以通过具有给定屈服位移和容量曲线形状的单自由度系统近似。对于八层的案例研究大楼，变形检查是控制极限状态。使用依赖于所需MAF的地震强度进行常规基于代码的设计，以进行安全检查。然后，基于YFS的方法用于重新设计从所需的响应MAF（而不是强度）向后工作的所得结构，以估算在典型工程设计过程中使用的适当地震强度值。对于这种高抗震性和高重要性的中层建筑，可以得出具有较高基础抗剪强度的刚性系统。此外，通过增量动态分析进行的性能评估表明，尽管代码设计未达到所需的性能目标，但基于YFS的重新设计仅需要推入分析结果即可提供接近最佳的设计结果。该方法在单个设计/分析迭代中的快速收敛强调了其效率和实用性，可作为实际应用的设计辅助。版权所有（c）2017 John Wiley＆Sons，Ltd.

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