| Summary: | Precast system which begins popular is an alternative way to substitute the
conventional system (case in place). An innovation has been done by PT.Holcim in
creating a new precast system which probably conduce the more advantage to precast
system. Precast beam in this system consist of a U shape (bataton-U) with 140 x 140 x
290 mm and column with 290 x 290 x 140 mm in size. The objective of this research is
to know whether the precast joint could be applied for building in seismic area.
There are two beam-column joint specimens of precast and monolith with the
similar reinforcement. Beam-column joint placed between two loading frame and
restraint at the lower end of K-2 column as a roll and K-1 as a hinge. Whereas B-1 beam
is free (cantilever). Column K-2 subjected to axial force constant in 144.42 kN. After
data collective, analysis to acquire a relation of load and displacement, stiffness,
ductility, damping, curvature and performance level structure were done using SAP
2000 software.
The result obtained from research show monolith joint has 20.40 kN of
maximum lateral load capacity and precast joint has 19.00 kN. Avarage ductality of the
monolith joint is 5.04 and precast joint is 4.86. Avarage elastic stiffnes (kc) of the
monolith joint and precast joint 2.29 kN/mm and 1.93 kN/mm respectively. The first
crack of monolith joint occurred at 5.85 kN of loading and precast joint at 5.95 kN.
Failure criteria of all specimen categorized us flexural failure. The result from all joint
specimens shows hysteteric loops shape were similar, with a wide loop. According to
ACI T1.1, if the joint specimen is unappropiate for received criteria with drift ratio of
3.5% and 2.5%, continuation analisys will be done using pushover analisys method
with the help of SAP 2000 software. It was obtained 6.69 of madification respon factor
(R) and 4.17 of ductility (µ). There for, it can stated that performance level of precast
structure in this research is life safety category (LS).
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