Exterior Corner Beam-column Joints
Principal Researcher: Stefano Pampanin
Staff involved:
Students involved:Eric Hertanto, Umut Akguzel, Patricio Quintana Gallo,
Limited information is available in literature on the performance of exterior (corner) 3-dimensional (3D) reinforced concrete (RC) beam-column joints with substandard detailing, typical of pre-1970s construction practice. Most of the experimental studies on the seismic assessment and retrofit of existing, poorly detailed, RC beam-column joints have typically concentrated on the 2-dimensional (2D) response thus based on uni-directional cyclic loading testing protocol under constant axial load.
As part of this research, a comprehensive experimental program have been presented aiming to show the effects of varying axial and bi-directional loading on the seismic performance of deficient exterior RC beam-column joints before and after retrofit. Ten exterior beam-column joint subassemblies have been tested, including four as-built specimens and six retrofitted specimens using externally bonded glass fiber reinforced polymer (GFRP) sheets.
Theoretical considerations regarding the retrofit design and methodology along with the validation with experimental results are covered thoroughly in the companion paper. Test results are presented and conclusions are drawn on the basis of observed global and local performance. The significance of the triaxial interaction of varying axial and bidirectional loading effects on the response of retrofitted corner joints as well as the efficiency of the proposed retrofit solution was confirmed by the experimental findings.
For more information, refer to the following references:
Akguzel, U., Pampanin, S., (2009) "Effects of Variation of Axial Load and Bi-directional Loading on Seismic Performance of GFRP Retrofitted Reinforced Concrete Exterior Beam–Column Joints. Part I: Experimental Study." ASCE Journal of Composites for Construction (submitted) pdf [coming soon]
Akguzel, U., Pampanin, S., (2009) "Analytical Model for Shear Strengthening of RC Beam-Column Joints Using Composite Materials." Proceedings of the Annual NZSEE 2009 Conference, Christchurch, April 2009. Paper No 53 pdf
Pampanin, S., Akguzel, U., Attanasi, G. (2007) Seismic Upgrading of 3-D Exterior R.C. Beam Column Joints Subjected To Bi-Directional Cyclic Loading Using GFP Composites,. Patras, Greece: 8th International Symposium on Fiber Reinforced Polymer Reinforcement for Concrete Structures, 16-18 Jul 2007. pdf
Dr Yuji Ishikawa , Dr Stefano Pampanin and Phd student, Umut Akguzel - at the end of a 3D bi-axial corner beam-column joint test with variation of axial load.