Abstract:
The design of a composite frame joint was characterized in a high level of seismic performance
when subjected to cyclic loading. Composite structures were used for the Construction of high rise building, bridge and heavy structure to safeguard steel members from fire and corrosion,
reduce the cost of construction, and enhance both resistance and stringency. Among the
composite frame joint, the beam column joint plays a crucial role in determining the overall
behavior of the structure. This research focus on the numerical simulation investigation of
composite encased beam column interior joints under cyclic loading by finite element method.
The responses of hysteresis curve, load carrying capacity and failure mode was investigated.
Using developed models Parametric study have been done to investigate the effects of concrete
strength, uniaxial load ratio with a constant eccentricity of e=10mm, longitudinal
reinforcement ratio, and transverse reinforcement spacing were utilized to investigate the
composite encased beam column joints under cyclic loading. Totally 43 specimen carried out
to examine their lateral load carrying capacity, mode of failure and hysteresis behavior under
cyclic load of the beam column joint.
The result of load carrying capacity under cyclic load was increased by 12.36% as concrete
grade increase C-60 to C-90 and increased again the load capacity increased by 14.31% as
concrete grade increase to C-100 concrete grade strength. The result of load carrying capacity
decrease by 1.49% when uniaxial load increase 20% to 30% and decrease by 1.63% as
uniaxial load increase 20% to 40%. This indicate that the load carrying capacity of FEC beam
column under cyclic loading were slightly influenced by the percentage increase of the design
plastic resistance decrease the performance. Longitudinal reinforcement ratio increase from
0.0094 to 0.0283 increase load carrying capacity by 14.31% and the longitudinal
reinforcement ratio from 0.0188 to 0.0283 also increased the load carrying capacity by 2.23%.
The transverse reinforcement spacing increase from 40mm to 80mm space have decrease load
carrying capacity by 4.65%. The stirrup has high contribution to keeps the longitudinal
reinforcement from buckling and concrete from spalling. The future for further understanding
works recommended on the effects of different steel shape with normal concrete strength and
additional experimental study under cyclic loading
