A Spectral Acceleration Based Intensity Measure for Seismic Assessment of P-Delta Vulnerable Frame Structures in the Collapse Limit State


Abstract eng:
The efficiency of a recently introduced spectral based intensity measure (IM) is assessed, used for the assessment of the seismic collapse capacity of highly inelastic frame structures with deteriorating backbone curve vulnerable to the degrading effect of gravity loads (P-delta effect). This IM is derived from the geometric mean of the spectral pseudo-acceleration over a certain period interval considering period elongation due to inelastic deformations and gravity loads, as well as higher mode effects. The IM optimization is achieved by using the mode in which 95% of the effective modal mass is exceeded as a lower bound period of the averaging interval. The IM upper bound period is 1.6 times the fundamental period. The 5%damped spectral pseudo-acceleration at the system’s fundamental period is the benchmark IM. In a parametric study on generic frames, characteristic structural parameters are varied to quantify their impact on the performance of the IMs. The proposed IM minimizes collapse capacity due dispersion due to record-to-record variability for one-story and multi-story structures. Compared to the benchmark IM, the “optimal” IM increases the efficiency in average by about 20% for material non-deteriorating structures, and by 30% for medium material deteriorating systems.

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Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 235.:
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