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Quantitative Evaluation of Code Provisions for Vertically Irregular Frame Buildings

机译：垂直不规则框架建筑规范规定的量化评估

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Vertically irregular buildings are addressed in building codes by imposing design requirements and limitations on buildings with the intention of maintaining acceptable seismic performance. However, relatively few studies have quantitatively evaluated the treatment of vertical irregularities in design codes. This study assesses the collapse performance of a variety of vertically irregular buildings as well as their treatment in building codes and standards (primarily ASCE/SEI 7-16) using the FEMA P695 Methodology. The following vertical irregularities are examined in this study: Soft Story Irregularity, Mass Irregularity, and Weak Story Irregularity; also explored are thresholds for strong-column/weak-beam (SCWB) requirements and the effect of gravity-induced lateral loads on collapse potential. These irregularities were analyzed in OpenSees using non-linear building frame models ranging from 3 to 20 stories located in both high and low seismicity regions. Preliminary results suggest that the ASCE/SEI 7-16 seismic design provisions generally provide adequate collapse resistance for regular and vertically irregular buildings. However, caution is recommended when "optimizing'" a building design by reducing member sizes to the point that code requirements are barely met throughout the structure; this may dangerously reduce collapse resistance. It is a further early conclusion of this work that prohibition of the Equivalent Lateral Force (ELF) method for some vertical irregularities, such as Mass Irregularity, is unnecessary, because the ELF design procedure generally results in equivalent or better collapse resistance than the Modal Response Spectrum Analysis (MRSA) procedure (even when the MRSA base shear is scaled up to 100% of the ELF value, as required in ASCE/SEI 7-16).
机译：通过对建筑物的设计要求和限制来保持垂直的建筑典范，以维持可接受的地震表现来解决垂直不规则的建筑物。然而，相对较少的研究已经定量地评估了设计代码中垂直不规则性的处理。本研究评估了各种垂直不规则建筑物的崩溃性能以及使用FEMA P695方法的构建代码和标准（主要是ASCE / SEI 7-16）的处理。在本研究中检查了以下垂直违规行为：软体故事不规则，质量不规则，弱故事不规则;还探索了强柱/弱梁（SCWB）要求的阈值，重力引起的横向载荷对塌陷电位的影响。使用从位于高和低地震区的3至20个故事的非线性建筑框架模型分析了这些不规则性。初步结果表明ASCE / SEI 7-16地震设计规定通常为常规和垂直不规则建筑提供足够的崩溃阻力。但是，当“优化”通过减少成员大小到整个结构几乎遇到的代码要求“优化”建筑设计时，建议谨慎;这可能会危险地降低崩溃阻力。这项工作的另一个早期结论是，不需要禁止对一些垂直不规则性的等效横向力（ELF）方法，例如质量不规则，因为ELF设计程序通常导致比模态反应相当或更好的崩溃抵抗力根据ASCE / SEI 7-16所需，频谱分析（MRSA）过程（即使MRSA基础剪切缩小到矮子值的100％）。

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