Finite Element Modelling of RC Beam-column Joint before and after retrofitting
Principal Researcher: Stefano Pampanin
Staff involved: Prof Eligehausen (Uni. of Stuttgart), Prof Josko Ozbolt (Uni. of Stuttgart), Prof Athol Carr
Students involved: Kam Weng Yuen, Giovacchino Genesio
To investigate the seismic response of an exterior bc joint, before and after a selective weakening retrofit, FEM analyses have been carried out using the software MASA. MASA, developed at the University of Stuttgart (Ožbolt et al., 2001), is based on a micro-plane concrete model with relaxed kinematic constraints within a smeared crack approach. Proper modeling of the bond-slip relationship for plain round bars have been recently implemented and successfully validated with experimental results (Eligehausen et al., 2008). Below is an excerpt of some preliminary results of MASA simulation of as-built joint and selectively weakened beam-column joint, presented at the 14th World Conference on Earthquake Engineering in Beijing.
Other preliminary results have been presented at several international conferences and we have been given some very positive feedbacks. Please check the following references for further information:
Selected Publications:
Eligehausen, R.; Genesio, G.; Ozbolt, J.; Pampanin, S.: 3D Analysis of Seismic Response of RC Beam-Column Exterior Joints before and after retrofit. In: Concrete Repair, Rehabilitation and Retrofitting II. 2nd International Conference on Concrete Repair, Rehabilitation and Retrofitting , Universities of Cape Town and Witwatersrand and Universität Leipzig, November 24th - 26th, 2008, Cape Town, South Africa. Leiden, The Netherlands: CRC Press / Balkema, 2008, pp. 407-408. pdf [coming soon]
Kam, W.Y., Pampanin, S. (2008) "Selective Weakening Techniques for Retrofit of Existing Reinforced Concrete Structures" Proc. of 14th World Conference on Earthquake Engineering (14WCEE) 2008 , Beijing, China. (Paper ID: 05-03-0074) pdf
Eligehausen, R., Ožbolt, J., Genesio,G., Hoehler M. S Pampanin, S. (2006) Three-Dimensional Modelling of Poorly Detailed RC Frame Joints, Proceedings of the Annual NZSEE Conference, Napier, March 2005. pdf