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Structural Engineering and Mechanics   Volume 52, Number 2, October25 2014, pages 427-443
DOI: https://doi.org/10.12989/sem.2014.52.2.427
 
Interaction of internal forces of interior beam-column joints of reinforced concrete frames under seismic action
Hua Zhou and Jiangli Zhang

 
Abstract     [Buy Article]
    This paper presents detailed analysis of the internal forces of interior beam-column joints of reinforced concrete (RC) frames under seismic action, identifies critical joint sections, proposes consistent definitions of average joint shear stress and average joint shear strain, derives formulas for calculating average joint shear and joint torque, and reports simplified analysis of the effects of joint shear and torque on the flexural strengths of critical joint sections. Numerical results of internal joint forces and flexural strengths of critical joint sections are presented for a pair of concentric and eccentric interior connections extracted from a seismically designed RC frame. The results indicate that effects of joint shear and torque may reduce the column-to-beam flexural strength ratios to below unity and lead to \"joint-yielding mechanism\" for seismically designed interior connections. The information presented in this paper aims to provide some new insight into the seismic behavior of interior beam-column joints and form a preliminary basis for analyzing the complicated interaction of internal joint forces.
 
Key Words
    axial strength; beam columns; flexural strength; interaction; joints; reinforced concrete; seismic behavior; shear; torsion
 
Address
Hua Zhou: Hainan University, 58 Renmindadao, Haikou, Hainan, 570228, PRC; APCE Design Group Limited, 2nd Floor, Tower A, 19 Yusha Road, Haikou, Hainan, 570125, PRC
Jiangli Zhang: Hainan University, 58 Renmindadao, Haikou, Hainan, 570228, PRC
 

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