Optimal Spectral Acceleration-based Intensity Measure for Seismic Collapse Assessment of P-Delta Vulnerable Frame Structures |
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| Authors: | Christoph Adam David Kampenhuber Luis F Ibarra Styliani Tsantaki |
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| Institution: | 1. Unit of Applied Mechanics, University of Innsbruck, Innsbruck, Austriachristoph.adam@uibk.ac.at;3. Unit of Applied Mechanics, University of Innsbruck, Innsbruck, Austria;4. Department of Civil and Environmental Engineering, University of Utah, Salt Lake City, Utah, USA |
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| Abstract: | This study proposes an “optimal” spectral acceleration-based intensity measure (IM) to assess the collapse capacity of highly inelastic frame structures vulnerable to the P-delta effect. The IM is derived from the geometric mean of the spectral pseudo-acceleration over a certain period interval. The lower bound period of the averaging interval is related to the mode in which 95% of the effective modal mass is exceeded. The upper bound period is 1.6 times the fundamental period. This IM provides minimum, or close to the minimum, dispersion for frames with different fundamental periods of vibration, or number of stories. |
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| Keywords: | Collapse Capacity Efficiency Geometric Mean of Spectral Acceleration Ground Motion Uncertainty Intensity Measure P-Delta Effect |
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