Le. Aycardi et al., SEISMIC RESISTANCE OF REINFORCED-CONCRETE FRAME STRUCTURES DESIGNED ONLY FOR GRAVITY LOADS - EXPERIMENTAL PERFORMANCE OF SUBASSEMBLAGES, ACI structural journal, 91(5), 1994, pp. 552-563
Citations number
10
Categorie Soggetti
Construcion & Building Technology","Material Science
The behavior of gravity load-designed reinforced concrete members unde
r simulated seismic loading was investigated experimentally. Four colu
mn specimens, loaded with low and high levels of axial forces, with an
d without lap splices, representing interior and exterior columns at f
loor slab and beam soffit levels, were examined under reversed cyclic
loading at increasing drift amplitudes until failure. The failure of a
ll columns was flexurally dominated, resulting from either: concrete c
rushing and buckling of the longitudinal steel in the case of columns
with high axial load; or from low-cycle fatigue of the longitudinal ba
rs in columns with low levels of axial load AIL columns were capable o
f sustaining at Least two cycles of loading at a 4 percent drift angle
. In addition, two specimens at one-third scale that model typical ext
erior and interior slab-beam-column subassemblages, of a prototype bui
lding frame designed and detailed only for gravity loads, were subject
ed to axial load and reversed cyclic lateral displacements. The exteri
or subassemblage experienced a weak beam-strong column failure mechani
sm, whereas the interior; subassemblage developed a weak column-strong
beam mechanism. This paper presents important experimental results, a
nd attempts to model analytically the seismic behavior and parameters
that govern the seismic response. Conclusions are drawn on how individ
ual detailing deficiencies can affect the seismic response and failure
mechanism of a structural frame as a whole.