Jm. Bracci et al., SEISMIC RESISTANCE OF REINFORCED-CONCRETE FRAME STRUCTURES DESIGNED FOR GRAVITY LOADS - PERFORMANCE OF STRUCTURAL SYSTEM, ACI structural journal, 92(5), 1995, pp. 597-609
Citations number
16
Categorie Soggetti
Construcion & Building Technology","Material Science
This is the second paper in a series dealing with the behavior of grav
ity load designed (GLD) reinforced concrete frame structures subjected
to simulated seismic motion that was investigated in an experimental/
analytical study. A three-story 1:3 reduced scale model was constructe
d with strength and reinforcing details compatible with current nonsei
smic provisions of ACI 318-89. The model was tested using simulated ea
rthquakes representing minor, moderate, and severe seismic risks for l
ow to moderate earthquake zones. The experiments were performed on the
''shaking table'' at the State University of New York (SUNY) at Buffa
lo using constant acceleration similitude, assuming material scaling i
dentity. The performance of subassemblages, i.e., columns and beam-col
umn joints, was also studied experimentally at the same scale to deter
mine the strength and deformation capacities of the structural compone
nts. The behavior of the subassemblages was presented in the first pap
er of this series.(1) Comparative analytical evaluations of the respon
se of the structural system were carried out using plastic (limit) ana
lysis, nonlinear quasistatic pushover analysis, and full nonlinear tim
e history dynamic analysis. The analytical and experimental performanc
e of the model building shows that substantial lateral resistance deve
lops in spire of the structure being designed only for gravity loads (
U = 1.4D + 1. 7L), without due regard to seismic loads and special det
ailing provisions. This paper demonstrates how to evaluate the overall
seismic performance of a structural frame based on adequate knowledge
of component behavior It also attempts to evaluate the safety margins
against damage and collapse of the structural system.