Bereket Netsanet Bekele, Lecturer
Department of Civil Engineering, Wolaita Sodo University, Ethiopia.
Wudenesh Honja Angelo, Lecturer
Department of Civil Engineering, Wolaita Sodo University, Ethiopia.
Effect Of Vertical Irregularity On Fundamental Period And Stability Of Reinforced Concrete Building
Authors
Abstract
Now a day, many building have not regular configuration both in plan and in elevation due to different
functional and aesthetic requirements. Hence, the evaluation of the seismic behavior of reinforced concrete
building with plan and elevation irregularity is required. In this study the evaluation of the effect setback
irregularity on fundamental and stability of reinforced concrete. The standards used for analysis of base case
building and vertical irregular building using response spectrum analysis (RSA) method are adopted according
to the provision of ES EN 1998-1:2015. The evaluation of fundamental period and stability based on the value
of sensitive inter-story drift were assessed in detail using seven different building. Story eight and Story twelve
reinforced concrete building with different setback irregularity were selected and their responses were compared
with the ones of a corresponding base case was done using ETABS 2016.1.0 software. The setback of building
is formed by the abrupt reduction in different floor area along the height of the building. The fundamental
period and stability of setback buildings was found to be significantly different from the base case building,
according to the findings of this study. It was discovered that the fundamental period of rigidity irregular
buildings is longer than that of equivalent regular buildings. The fundamental period of a setback structure is
shorter than that of a comparable regular structure. The findings reveal that the seismic response variation of
setback building from the base case is dependent not only on the size of the irregularity, but also on the
placement of the irregularity.