DUCTILITY EVALUATION OF REINFORCED CONCRETE COLUMN MADE OF NORMAL- TO HIGH-STRENGTH CONCRETE UNDER CONSTANT AXIAL LOAD LEVEL COMBINED WITH FLEXURAL LOADING USING NONLINEAR SECTIONAL FIBER BASED MODEL

Bambang Piscesa,Harun Alrasyid,Dwi Prasetya,Mudji Irmawan

doi:10.12962/j20861206.v34i1.5451

Bambang Piscesa, Harun Alrasyid + Show 2 more

Open Access

https://doi.org/10.12962/j20861206.v34i1.5451

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Abstract

This study presents the ductility evaluation of reinforced concrete column made of normal-strength material using various empirical stress-strain model with nonlinear sectional fiber based analysis. The purpose is to evaluate the confinement requirement for reinforced concrete column under high axial load level. The concrete strength considered in the analysis are varies from 30 to 70 MPa while the steel reinforcing bar yield strength considered is only 400 MPa. The ductility is evaluated by using the customized ductility index measurement. The ratio of the concrete cover to the concrete core is set to 0.1 but not more than 40 mm. Attard and Setunge’s concrete constitutive model is used in this investigation. Cover spalling behavior is considered in the analysis by including the restrained shrinkage effect on the concrete strength and the softening behavior. From this study, it was found that extra confinement is necessary to maintain the expected minimum level of ductility.

Highlights

It is well known that the behavior of RC column is greatly affected by the applied axial load level
Existing building codes, such as ACI 318-14 [18], CSA A23.3-04 [19], NZS 3101:2006 [20] and SNI 2847-2019 [21], provide additional clause for the minimum confinement reinforcement [22] if the column were loaded with high axial load level
One of the interesting facts is that this additional confinement requirement is applied for RC column loaded with high axial load level and for high-strength concrete (HSC) regardless of the axial load level applied on the column

Summary

INTRODUCTION

It is well known that the behavior of RC column is greatly affected by the applied axial load level. At the same amount of confinement level, the post-peak behavior of RC column degenerates as the axial load level increases [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17] Existing building codes, such as ACI 318-14 [18], CSA A23.3-04 [19], NZS 3101:2006 [20] and SNI 2847-2019 [21], provide additional clause for the minimum confinement reinforcement [22] if the column were loaded with high axial load level. This I10 ductility index [24, 25] use the energy under the load-deflection curve which is a more reasonable approach to measure the ductility level of RC column

METHODOLOGY

NONLINEAR SECTIONAL FIBER BASED MODEL

MEASUREMENT OF THE DUCTILITY INDEX

[8] CONCLUSIONS

Findings

[15] REFERENCES