An Overview of the Effects of High-Strength Reinforcement (HSR) on the Intermediate Moment-Resisting Frames

Kheyroddin, A.; Arshadi, H.; Binaipur, F.

doi:10.22060/ceej.2017.12406.5207

An Overview of the Effects of High-Strength Reinforcement (HSR) on the Intermediate Moment-Resisting Frames

Document Type : Research Article

Authors

Department of Civil Engineering, Semnan University, Semnan, Iran

10.22060/ceej.2017.12406.5207

Abstract

Increasing volume of constructions and necessity of having economic structures lead to the
production of high-strength reinforcement (HSR). HSRs have many benefits; however, because of limitation
in producing ductile HSR and the effect of HSR in the reduction of overall ductility of reinforced concrete
structures, its application has been limited in seismic prone areas especially in special Reinforced concrete(RC)
moment-resisting frames. In this research, the effect of HSR application on drifts, displacements, and quantity of consumed steel are studied by the linear static analysis, and also the base shear and proportionate displacements to them are studied by the nonlinear static analysis (Pushover) with ETABS software (for nine models with different numbers of stories and grades of steel). Then, the tensile strains of beams’ ends which can be a representation of cracking phenomenon in concrete are acquired conducting nonlinear dynamic analysis with Opensees. Ultimately, it is shown that although HSRs have economic benefits, they increase displacements and drifts. To compensate this issue, it is necessary to increase the rigidity of members by increasing steel quantity or dimension of members. This is a serious challenge because it neutralizes steel consumption reduction. It is also shown that by substituting the reinforcement bars for higher grade ones: the level of tensile stress in concrete alongside with the tolerated displacement in order to enter the nonlinear stage in Pushover analysis increases. Moreover, the less the grades of steel, the fewer shears are tolerated by structures.

Highlights

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