Effect Of Ductility Class On The Seismic Performance Of Irregular Reinforced Concrete Frame Structures According To Es-En Provision

Abstract

Earthquake is one of disastrous consequences and vulnerability of inadequate structures. The main cause of failure of multi-storey multi-bay reinforced concrete frames during seismic motion was in appropriate design of structures for ductility class. This cause in addition to irregularity (pane or vertical) future the failure is high so the effect of the ductility class on the performance of seismic load of vertical geometric irregular reinforced concrete structure should be evaluated. In this study, the effect of ductility classes on the seismic performance of reinforced concrete frame structures was investigated in detail. In Ethiopian new code ES EN-1998-1-2015, three types of ductility classes were provided with their respective requirements. And to know the effect of ductility classes on the seismic performance of the structure, design of geometrical vertical irregular reinforced concrete structures will be done according to the new code capacity rule provision for each ductility classes. The evaluation is done by designing vertical geometric irregular structures for different ductility classes with the provision of new seismic code and by checking their performance through non-linear (pushover) analysis using CSI ETABS 2016 V.2.1. So structures designed for high ductility class were found to be better than structures designed for medium ductility regarding to capacity of the structures base shear increased by 7.04%, 12.14%, 5.18%, 13.77%, 12.37%, 5.33%, 4.52% and 8.78% and increased by 2.51%, 22.05%, 21.23%, 6.67%, 4.91%, 0.33%, 3.51% and 0.69% along in the X and Y whereas for inter storey drift the medium ductility class was performed better resistance than high ductility class. This research is done only for moment resisting frames, the evaluation of the effect of ductility class on the performance of reinforced concrete for dual and wall systems is recommended. As well as evaluation of the effect of ductility class on the performance of reinforced concrete for irregular structures (stiffness, mass and the combination of both) uses statics nonlinear analysis or dynamic non-linear analysis.