Investigation of the effect of a bar's inadequate embedded length on the P-M interaction curve of reinforced concrete columns with rectangular sections

Seyed Shaker HASHEMI; Mohammad VAGHEFI

Makale detayları

Investigation of the effect of a bar's inadequate embedded length on the P-M interaction curve of reinforced concrete columns with rectangular sections

Yazarlar:

Seyed Shaker HASHEMI | Mohammad VAGHEFI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Engineering and Environmental Sciences 2012 Vol.36 Issue 2, pp.109-119

Belge Tipi:

Makale

Yayın Tarihi:

1/2012

Belge Dili:

Türkçe

Document ID (Org No.):

2000744616

Sıklık:

Üç Yıllık

eISSN:

1303-6157

pISSN:

1300-0160

Özet:

 

In this research, the effects of embedded length and  pull-out force on the seismic behavior of a reinforced concrete (RC)  column were investigated.  Separate degrees of freedom were used for  the steel and concrete parts in the nonlinear modeling of the RC  elements in order to consider the bond-slip effect.  The analytical  method was assessed through the comparison of experimental and  analytical results.  The effect of the bar's slippage on the axial  force-bending moment (P-M) interaction curve of the RC column was  calculated by nonlinear modeling of pull-out behavior.  The P-M  interaction curves for a variety of columns with different embedded  bar lengths in the footing were calculated and compared.  In most  recommendations and instructions for the capacity of RC columns, it is  assumed that the embedded length of the longitudinal bars in the  joints is sufficient and slippage will not occur.  However, in this  research, the effect of reduction of the embedded length on the P-M  interaction curve of RC columns was evaluated, and, in the end, a  modification strategy was proposed for the curve suggested by the  American Concrete Institute.  The results show that as long as the  embedded length is sufficient, responses do not differ significantly.  By reducing the embedded length, much of the effect of the bar's  pull-out on the P-M interaction curve occurs in terms of pure bending  or low axial forces.  By increasing the percentage of longitudinal  bars, the capacity reduction increases due to the pull-out effect.

 

In this research, the effects of embedded length and  pull-out force on the seismic behavior of a reinforced concrete (RC)  column were investigated.  Separate degrees of freedom were used for  the steel and concrete parts in the nonlinear modeling of the RC  elements in order to consider the bond-slip effect.  The analytical  method was assessed through the comparison of experimental and  analytical results.  The effect of the bar's slippage on the axial  force-bending moment (P-M) interaction curve of the RC column was  calculated by nonlinear modeling of pull-out behavior.  The P-M  interaction curves for a variety of columns with different embedded  bar lengths in the footing were calculated and compared.  In most  recommendations and instructions for the capacity of RC columns, it is  assumed that the embedded length of the longitudinal bars in the  joints is sufficient and slippage will not occur.  However, in this  research, the effect of reduction of the embedded length on the P-M  interaction curve of RC columns was evaluated, and, in the end, a  modification strategy was proposed for the curve suggested by the  American Concrete Institute.  The results show that as long as the  embedded length is sufficient, responses do not differ significantly.  By reducing the embedded length, much of the effect of the bar's  pull-out on the P-M interaction curve occurs in terms of pure bending  or low axial forces.  By increasing the percentage of longitudinal  bars, the capacity reduction increases due to the pull-out effect.

Makale detayları

Investigation of the effect of a bar's inadequate embedded length on the P-M interaction curve of reinforced concrete columns with rectangular sections

Yazarlar: Seyed Shaker HASHEMI | Mohammad VAGHEFI

Yayıncı: TUBITAK

Dergi: Turkish Journal of Engineering and Environmental Sciences 2012 Vol.36 Issue 2, pp.109-119

Belge Tipi: Makale

Yayın Tarihi: 1/2012

Belge Dili: Türkçe

Document ID (Org No.): 2000744616

Sıklık: Üç Yıllık

eISSN: 1303-6157

pISSN: 1300-0160

Sayı

Yazarlar:

Seyed Shaker HASHEMI | Mohammad VAGHEFI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Engineering and Environmental Sciences 2012 Vol.36 Issue 2, pp.109-119

Belge Tipi:

Makale

Yayın Tarihi:

1/2012

Belge Dili:

Türkçe

Document ID (Org No.):

2000744616

Sıklık:

Üç Yıllık

eISSN:

1303-6157

pISSN:

1300-0160