Research Description
This study utilizes ETABS Ultimate 22.0.0 to analyze multistory
concrete buildings with floating columns on transfer beams situated in
seismic zone III. The study examines the impact of construction
sequence analysis (CSA) coupled with equivalent static analysis (ESA)
of the response spectrum analysis (RSA) to showcase realistic loading
scenarios. The variables examined in the study include the effects of the
stiffness of the transfer beams of the floating columns, placement,
supporting conditions within the structural system, and the impact of
including basements. The analysis revealed that increasing the size of
the transfer beams from 400×700 mm to 800×1600 mm resulted in
significant changes to CSA methods consistent with the Egyptian Code;
flexural stiffness increased by 194.91%, shear strength increased by
137.94%, and mid-span deflections decreased by 84.95%, while also
improving compressive stress and slab deflection performance by
200.71% and 42.62%, respectively. The performance of the composite
beams improved by 20.39% for moment forces, 77.23% for shear forces,
and 40% for mid-span deflections, and the placement of the floating
columns on the outer axes reduced the axial forces of the floating
columns by 28% in comparison to the internal axes. The study urges
Egyptian codes to include design requirements for transfer beams and
to adhere to international deflection standards to ensure structural
integrity.
