A Review on Reinforced Concrete Beam Column Joint: Role, Modeling and Recent Details

Keywords: Beam-column joint, code provisions, joint efficiency, RC frames, retrofitting schemes.

Abstract

Reinforced concrete RC frames are commonly used system in RC buildings. The philosophy behind the proper design for this type of frames is to provide them with sufficient ductility. The structural ductility of a frame is mainly determined by the ductility of its components, i.e. the beams, columns and joints forming this frame. Beam-column joint BCJ role in a building is to connect its components together and enable these component to reach their ultimate resistance. BCJ stiffness, strength and ductility are key characteristics needed to guarantee efficient building behaviour under the action of different loads. 

Previous research shows that building’s damage may be caused by inadequate reinforcement details of its BCJs. Deficiency in joints performance is related to inadequate codes guidelines or to bad construction practice. This paper reviewed the provisions of three different codes (ACI 318-08, Eurocode 8 and ECP-203) concerning the proper design and detailing of different BCJs. This review study aims to introduce a wider overview on the assessment of BCJ performance in buildings under different loading scenarios. This data base will enable the practicing engineers to identify the joint key parameters with providing different analytical procedures. This study investigates joints in different configurations. These include planner joints, joints with transverse beams and the common joint situation with the presence of both transverse beams and slab. This survey includes experimental and analytical representation of the previous mentioned joints. Different retrofitting schemes are presented as well for every considered joint. This review allows to identify the evolution of joints capacity in function of reinforcement detailing, level of axial stresses and loading history. The analysis shows that a decrease in joint resistance can be recovered by using i) haunches brackets, ii) FRP, or iii) post tension metal strip.

References

Park, R., and Paulay, T., 1975. Reinforced concrete structures, John Wiley and Sons, New York, 769 pp.

ACI 318-08 Committee, 2008.Building Code Requirements for Structural Concrete (ACI 318-08) and Commentary, American Concrete Institute, Farmington Hills, Michigan.

Salah, E. and Wai-Fah C. 2017. Structural Concrete: Strut-and-Tie Models for Unified Design.1stEdition. CRC Press, Published September 27.

Yasser, H. 2012. Seismic strengthening of deficient exterior RC beam-column sub-assemblages using post-tensioned metal strips. PhD thesis Faculty of Engineering of the University of Sheffield.

Long, X., 2013. Numerical study on reinforced concrete beam-column frames in progressive collapse; Nanyang Technological University, PhD thesis.

Hassan, E.M., 2011. Analytical and experimental assessment of seismic vulnerability of beam-column joints without transverse reinforcement in concrete buildings, PhD thesis, University of California, Berkeley, CA.

Pantelides C., 2002. Assessment of reinforced concrete building exterior joints with substandard details, Technical Report PEER 2002-18, Pacific Earthquake Engineering Research Center (PEER), University of California, Berkeley, CA.

Published
2020-11-19
Section
Civil Engineering (1)