Analytical evaluation of structural component limit state probabilities |
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| Authors: | Xavier Romão João Guedes Aníbal Costa Raimundo Delgado |
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| Institution: | (1) Civil Engineering Department, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;(2) Autonomous Civil Engineering Section, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal |
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| Abstract: | Probabilistic seismic assessment requires extensive computational effort resulting from variability both in input ground motions
and mechanical properties. Nonetheless, such methodologies are of considerable importance, namely for pre-earthquake disaster
planning or development of retrofitting programs. A framework for the analytical definition of closed form expressions for
exceedance probabilities of structural component limit states, defined by limit values of structural response parameters,
is proposed herein. The definition of these expressions is based on the probabilistic representation of the ground motion
intensity and on the establishment of suitable expressions characterizing the evolution of structural demand with increasing
earthquake intensity. Distinction is made between deformation-based and force-based structural parameters in the definition
of such relations. Within the proposed framework, the limit states are defined by single deterministic thresholds of structural
response quantities at the component level, as defined in structural codes. Different approaches are also discussed to account
for the randomness of the mechanical properties and ground motion input within the proposed methodology. An application of
the assessment of different limit state probabilities of members from a reinforced concrete building is presented, for which
limit states and limit state capacities are defined according to the upcoming Part 3 of the Eurocode 8. Although the presented
application only deals with member chord rotation and shear force limit state probabilities, the proposed methodology can
be generalized to other deformation-based and force-based structural parameters. |
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| Keywords: | Component risk assessment Seismic risk Component limit state probability Seismic limit state Seismic hazard Component seismic assessment |
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