Fragility curves and failure models based on lumped damage mechanics applied to reinforced concrete frames under seismic loads
Palavras-chave:
Lumped damage mechanics, Performance Based Earthquake Engineering, Internal variables of damage, Fragility curves, Collapse mechanismsResumo
This paper presents a methodology to apply the Lumped Damage Mechanics (LDM) in the Perfor-
mance Based Earthquake Engineering (PBEE) approach, to evaluate the seismic vulnerability of reinforced con-
crete frames. The lumped damage model represents the evolution of damage and plasticity lumped in inelastic
hinges at the nodes of the elements. The method allows the estimation of material nonlinear effects due to shear
and bending moment under static, cyclic and dynamic loads, considering fatigue and hardening. Incremental dy-
namic analysis using artificial earthquakes are performed to calculate the fragility curves of the RC frames with
LDM. The paper proposes a procedure to identify and characterize collapse mechanisms from the local internal
variables of damage, using system reliability theory. The main results show that LDM can be efficiently applied
to PBEE and it is possible to use the internal variables of damage as engineering demand parameter (EDP) in the
vulnerability analysis.
