INFLUENCE OF THE RANDOMNESS OF THE MECHANICAL PARAMETERS ON THE SEISMIC DAMAGE ASSESSMENT OF R/C FRAMES
Conference Paper
Publication Date:
2010
abstract:
Within the procedures for the seismic assessment of R/C buildings according to
the PBSD method, a relevant source of response uncertainness consists in the
variation in member capacities associated to the randomness of the mechanical
parameters of the materials and of the geometrical parameters of the structural
members. Heavy numerical simulation analyses should be carried out to
characterize the response scattering, therefore a simplified procedure has been
outlined and applied to R/C members. In this case the post-elastic behavior is
usually modeled with plastic hinges and the uncertainty is defined through the
probability distribution of parameters at a higher level: yielding and ultimate
moment and curvature. A set of random configurations of a sample structure is
generated, accounting for the uncertainties in member capacity. The
simulations of the seismic response allow to define the scattering of the
demand parameters through their PDFs and to express them in terms of fragility curves. Contrarily to the current assumption, results show a non negligible influence of mechanical and geometrical uncertainness.
the PBSD method, a relevant source of response uncertainness consists in the
variation in member capacities associated to the randomness of the mechanical
parameters of the materials and of the geometrical parameters of the structural
members. Heavy numerical simulation analyses should be carried out to
characterize the response scattering, therefore a simplified procedure has been
outlined and applied to R/C members. In this case the post-elastic behavior is
usually modeled with plastic hinges and the uncertainty is defined through the
probability distribution of parameters at a higher level: yielding and ultimate
moment and curvature. A set of random configurations of a sample structure is
generated, accounting for the uncertainties in member capacity. The
simulations of the seismic response allow to define the scattering of the
demand parameters through their PDFs and to express them in terms of fragility curves. Contrarily to the current assumption, results show a non negligible influence of mechanical and geometrical uncertainness.
Iris type:
4.1 Contributo in Atti di convegno
Keywords:
damage assessment; randomness; mechanical uncertainty
List of contributors:
Comodini, Fabrizio; Mezzi, M.
Book title:
Third International fib Congress incorporating the PCI Annual Convention and Bridge Conference 2010