Investigation of the Moment–curvature Relationship for Reinforced Concrete Square Columns

Abstract

In this study; the effect of the material model, axial load, longitudinal reinforcement ratio, transverse reinforcement ratio and transverse reinforcement spacing on the behavior of reinforced concrete cross-sections were investigated. Squared cross-section column models have been designed. The effect of axial load, transverse reinforcement diameter and transverse reinforcement spacing on the behavior of reinforced concrete column models have been analytically investigated. The behavior of the columns was evaluated from the moment-curvature relation by taking the nonlinear behavior of the materials into account. The moment-curvature relationships for different axial load level, transverse reinforcement diameter and transverse reinforcement spacing of the reinforced concrete column cross-sections were obtained considering Mander confined model. Moment-curvature relationships were obtained by SAP2000 Software which takes the nonlinear behavior of materials into consideration. The examined effects of the parameters on the column behavior were evaluated in terms of ductility and the strength of the cross-section. In the designed cross-sections, the effect of transverse reinforcement diameter and transverse reinforcement variation on the confined concrete strength and the moment-curvature relationship was calculated and compared for constant longitudinal reinforcement ratio. The examined behavioral effects of the parameters were evaluated by comparing the curvature ductility and the cross-section strength. It has been found that transverse reinforcement diameters and transverse reinforcement spacing are effective parameters on the ductility capacities of the column sections. Axial load is a very important parameter affecting the ductility of the section. It has been observed that the cross-sectional ductility of the column sections increases with the decrease in axial load.

Investigation of nonlinear behavior of high ductility reinforced concrete shear walls

“…It has been observed in previous studies that the moment-curvature behaviors of the reinforced concrete columns are affected significantly by changes occurring in axial load, transverse reinforcement diameter, longitudinal reinforcement diameter, and transverse reinforcement spacing [16].…”

“…In the moment-curvature relationship, the RC shear wall peak displacement value up to the yield curvature can be calculated by Equation (1). The lumped plastic rotation ( ), along the plastic hinge length ( ) is then computed using Equation (2). Where refers to the maximum curvature and refers to the yield curvature, as shown in In the plastic hinge analysis, the total peak displacement of the RC shear wall before the collapse (∆ ) is obtained by summing its yield displacement ( ∆ ) and plastic displacement (∆ ) components (Equation (4)).…”

“…Predicting the deformation capacity of RC shear walls is very important for a comprehensive performance-based seismic evaluation of existing or new buildings [1]. In order to achieve a more accurate simulation of the real structural behavior, designers need the accurate momentcurvature relationship for RC members and stress-strain relationships for unconfined and confined concrete [2]. To be able to understand if a structural design, realized regarding a specific seismic code or not, achieves the main aim of the seismic design, displacement ductility can be utilized [3].…”

Sargı Donatısı ve Eksenel Yük Seviyesinin Betonarme Kolonların Eğrilik Süneklik ile Etkin Kesit Rijitliğe Etkisi

“…Foroughi ve Yüksel [12], malzeme modelinin, eksenel yük seviyesinin, boyuna donatı oranının, sargı donatı çapı ve sargı donatı aralığının kare en-kesitli betonarme kolon davranışı üzerindeki etkisini araştırmışlardır. Eğrilik süneklikleri ve kesit kuvvetleri karşılaştırılarak parametrelerin davranışsal etkilerini incelemişlerdir.…”

Investigation of Nonlinear Behavior of the Reinforced Concrete Columns for Different Confined Concrete Models

“…Reinforced concrete (RC) columns are the critical members of moment-resisting structural systems and have to be designed adequationuately in strength and ductility [2]. Usually, it is desirable to design a RC member with sufficient curvature ductility capacity to avoid brittle failure in flexure and to insure ductile behavior, especially under seismic conditions [3]. The correct estimate of curvature ductility of reinforced concrete members has always been an attractive subject of study as it engenders a reliable estimate of the capacity of buildings under seismic loads [4].…”