A multi-direction pushover procedure for seismic response assessment of low-to-medium-rise modern reinforced concrete buildings with special dual system having torsional irregularity. (December 2020)

• Record Type: Journal Article
• Authors: Ghayoumian, Golnaz; Emami, Ali R.
• Is Part Of: Structures. Volume 28(2021)
• Page Start: 1077
• Page End: 1107
• Publication Date: 2020-12
• Subjects: Pushover -- Seismic design -- Reinforced concrete -- Torsional irregularity -- Damage index -- Ductility; Structural engineering -- Periodicals; 624.1
• DOI: 10.1016/j.istruc.2020.09.031
• Languages: English
• ISSNs: 2352-0124

Abstract

Abstract: Current study proposes a new approach for seismic response assessment of torsionally irregular modern buildings with special dual reinforced concrete system by multi-direction pushover analysis. Analytical formulas are developed to define distribution of inter-storey drift, ductility and damage indices in a 3-dimensional perspective wherein the response distributions can be monitored in all the principal/non-principal planar directions at each storey level. The applicability of the approach is examined by developing 3 nonlinear models of 4-, 8- and 12-storey archetypical building structures. The results indicate a substantial reduction of ductility capacity along the non-principal directions close to the plan bisectors of the buildings. Moreover, it is indicated that a constant storey drift limitation may not be always an appropriate acceptance criteria for seismic design purposes. To overcome these challenges, assumption of constant acceptable level of damage is proposed; this is quantified in terms of damage index.