Selective weakening and post-tensioning for retrofit of non-ductile R.C. exterior beam-column joints (2010)
PublisherUniversity of Canterbury. Civil and Natural Resources Engineering
A counter-intuitive “selective weakening” (SW) seismic retrofit strategy for non-ductile RC frame is presented. By focusing on increasing the global displacement and ductility capacity, simple retrofit interventions such as selective weakening of the beams and external post-tensioning of the beam-column joints could change the local inelastic mechanism and result in improved global lateral and energy dissipation capacities. After an overview of the SW retrofit concept, this paper presents the experimental and numerical investigations of SW retrofit techniques for non-ductile RC exterior joints. The experimental results of nine 2/3-scaled exterior joint subassemblies– as-built and SW retrofitted tests are briefly presented. Parameters considered in the tests included the presence of column lap-splice, slab and transverse beams, level of post-tensioning forces and location of beam weakening. Numerical investigation using 3D micro-plane concrete model within smeared fracture mechanics finite-element modelling is demonstrated for SW retrofitted joints. Lastly, a preliminary design procedure is outlined for the design of SW retrofit for exterior beam-column joints. With its economical, non-invasive and low-technology intensity approach, SW retrofit has potential for a wide implementation.
CitationKam, W.Y., Pampanin, S. (2010) Selective weakening and post-tensioning for retrofit of non-ductile R.C. exterior beam-column joints. Ohrid, Macedonia: 14th European Conference on Earthquake Engineering, 30th Aug - 3th Sept, 2010.
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Keywordsselective weakening; seismic retrofit; beam-column joint; reinforced concrete; post-tensioning
ANZSRC Fields of Research40 - Engineering::4005 - Civil engineering::400510 - Structural engineering
40 - Engineering::4005 - Civil engineering::400504 - Construction engineering
40 - Engineering::4005 - Civil engineering::400506 - Earthquake engineering
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A summary of test results for selective weakening and post-tensioning for retrofit of non-ductile R.C. exterior beam-column joints Kam, W.Y.; Pampanin, Stefano; Bull, D. (University of Canterbury. Civil and Natural Resources Engineering, 2010)This paper summarises the experimental results of a counter-intuitive seismic retrofit strategy – Selective Weakening, targeted at improving the seismic performance of poorly detailed (pre-1970) exterior beam-column ...
Displacement-based seismic retrofit design for non-ductile RC frame structures using local retrofit interventions at beam-column joints Kam, W.Y.; Pampanin, Stefano (University of Canterbury. Civil and Natural Resources Engineering, 2011)In the past design codes, infill panels/walls within frame buildings have been considered as non-structural elements and thus have been typically neglected in the design process. However, the observations made after major ...
Genesio, G.; Sharma, A.; Eligehausen, R.; Pampanin, Stefano; Reddy, G.; Vaze, K.K. (University of Canterbury. Civil and Natural Resources Engineering, 2010)Beam-column joints are recognized as the critical and vulnerable zone of a Reinforced Concrete (RC) moment resisting structure subjected to seismic loads. During an earthquake, the global response of the structure is ...