Concept Paper on Utilizing the FEMA P695 (ATC-63) Ground Motion Spectral Shape Guidelines to Adjust the Target Displacement in the ASCE/SEI 41 Nonlinear Static Procedure
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机译:关于利用FEMA P695(ATC-63)地面运动光谱形状指南的概念纸,以调整ASCE / SEI 41非线性静态过程中的目标位移
The FEMA P695 Methodology, developed through the recent ATC-63 Project, incorporates ground motion guidelines that include a so-called Spectral Shape Factor (SSF). This SSF adjusts the predicted collapse capacity of the building to account for the spectral shape of ground motions. This paper explains how aspects of this new FEMA P695 Methodology could be adapted for use in refining the target displacement equation (i.e. inelastic displacement demand) in the ASCE/SEI 41 Nonlinear Static Method to account for spectral shape. The final result would be an additional coefficient (termed the "spectral shape coefficient") that would reduce the target displacement for sites where the ground motion is expected to have a less damaging spectral shape. This paper outlines how one would compute this spectral shape coefficient for any site and building of interest, and then explains the additional work needed to implement this new coefficient into ASCE/SEI 41. An example is provided to illustrate the effect that the new coefficient has on the computed target displacement. For a 2% in 50 year motion at a San Francisco California site, application of the spectral shape coefficient results in a 40% reduction in the target displacement.
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机译:联邦紧急措施署P695方法,通过最近ATC-63项目开发,集成了地面运动的指导方针,其中包括所谓的频谱形状因子(SSF)。此SSF调整建筑预测倒塌能力以考虑地面运动的频谱形状。本文解释这个新的FEMA P695方法论的方面是如何可以适用于使用在ASCE炼目标位移方程(即非弹性位移需求)/ SEI 41非线性静态方法以考虑频谱形状。最终的结果将是,将减少在接地运动预期具有较少损坏频谱形状部位的目标位移的附加系数(称为“频谱形状系数”)。本文概述一个将如何计算该频谱形状系数的任何网站和感兴趣的构建,然后解释了实现这种新的系数成ASCE / SEI 41.一种示例所需要的额外的工作被提供以示出的效果,新的系数具有所计算的目标位移。用于在旧金山加利福尼亚部位的2%50年运动,在目标位移的40%减少的频谱形状系数的结果的应用程序。
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