| Summary: | Beam column joint is a very important structure element in the building
construction design and the weakest part if it is not well-designed. This research is
conducted to do a more thorough study about the strength of the beam column
joint within a bamboo building structure framework which given a cyclicload,
thus the bamboo strength can be optimally utilized. This research also studies
about the ductility, stiffness, hysteretic energy, potential, damping ratio also the
damage pattern of cross-typed interior beam column joint (+) in a simple building
structure framework.
In this research, two full-scale, cross-typed interior beam column joint (+)
is made and given the same treatment. The specimen was created with the
dimension of 3 x 3 m and has been preserved by using gravitation method with
borax solution. The bamboo used is a wulung bamboo, with three layer of beam
model and double layer of column model. The test object uses a ½� screw as its
shear connector and mortar as the filler, which is filled into the space inside the
bamboo, only on the joint area. The seismic load approach refers to the ASTM
2126-02a standard.
From the test result, B.U.1 specimen shows the average load in yield
condition of 4,59 kN and deflection of 76,78 mm, at peak condition the average
loads are 7,44 kN and deflection of 135,77 mm, at failure condition the average
load are 5,95 kN and deflection of 136,93 mm. B.U.2 specimen shows average
load in yield condition of 6,23 kN and deflection of 62,10 mm, at peak condition
with the average load of 9,84 kN and deflection of 131,06 mm, and at failure
condition with average load of 7,87 kN with deflection of 137,54 mm.
Crack/rupture on the specimen starts on the 9thcycle of beam joint area, along with
the load increase on each cycle. The elastic stiffness average for specimen B.U.1
and specimen B.U.2 is 0,11 kN/mm for tensile and 0,10 kN/mm for compressive.
The average maximum EVDR value of 10,08% shows that the structure behaviour
classified into the critical damping, which is below 20%. The joint ductility value
obtained was 1,78 for specimen B.U.1 and 2,23 for specimen B.U.2. According to
SNI-03-1726-2002, those ductility value classified into partial ductility, while
according to FEMA 306, belongs to the medium ductility.
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