Seismic Response of Precast Concrete Frames With Hybrid Connections.
Seismic Response of Precast Concrete Frames With Hybrid
Cheok, G. S.; Stone, W. C.; Kunnath, S. K.
ACI Structural Journal, Vol. 95, No. 5, 527-539,
analytical modeling; beam-column; building technology;
concretes; hysteresis model; joints (junctions); moment
resisting; post-tensioning; precast
The analytically simulated performance of
moment-resisting precase concrete frames with hybrid
connections under seismic loads is evaluated. An
enhanced and versatile hysteretic model was developed to
represent the inelastic behavior of the hybrid precase
connection region. The model parameters were calibrated
using results from a separate excperimental pgoram which
examined the inelastic cyclic behavior of hybrid
concrete precast connections. An interesting feature of
the connection was the hybrid combination of mild steel
and high strength or post-tensioning steel where the
mild steel was used to dissipate energy by ueilding and
the post-tensioning steel was used to provide the shear
resistance through friction developed at the beam-column
interface. To simulate the seismic response of actual
buildings constructed with such hybrid precast
connections, a series of two-dimensional structural
models representing typical four, eight, twelve and
twenty-two story precast frames was subjected to a
series of earthquake motions. The analyses included 29
different accelerograms, representing all three UBC soil
types, and were scaled to fit the UBC design spectra.
Results of the inelastic dynamic analyses are used in
conjunction with experimental results to develop simple
design guidelines for the use of rpecast concrete hybrid
connections in regions of high seismicity.