Myths and fallacies in earthquake engineering
Conflicts between design and reality
DOI:
https://doi.org/10.5459/bnzsee.26.3.329-341Abstract
Current practice in seismic analysis and design is examined, with particular reference to reinforced concrete structures. The attitude of the paper is deliberately iconoclastic, tilting at targets it is hoped will not be seen as windmills. It is suggested that our current emphasis on strength-based design and ductility leads us in directions that are not always rational. A pure displacement-based design approach is advanced as a viable alternative. Improvements resulting from increased sophistication of analyses are seen to be largely illusory. Energy absorption is shown to be a mixed blessing. Finally, accepted practices for flexural design, shear design, development of reinforcement, and the philosophic basis of capacity design are questioned.
References
Uniform Building Code, International Conference of Building Officials, Whittier, California, 1988, 926 p.
Code of Practice for General Structural Design and Design Loadings for Buildings, NZS 4203: 1984, New Zealand Standard, Standards Association of New Zealand.
Moehle, J.P., "Displacement-Based Design of RC Structures Subjected to Earthquakes," Earthquake Spectra, Vol 8, No.3, August 1992, pp. 403-428. DOI: https://doi.org/10.1193/1.1585688
Paulay, T. and MJ.N. Priestley, Seismic Design of Concrete and Masonry Structures, John Wiley and Sons, New York, NY, 1992, 744 pp. DOI: https://doi.org/10.1002/9780470172841
Shibata, A and M. A Sozen, "Substitute-Structure Method for Seismic Design in Reinforced Concrete." Journal of the Structural Division, ASCE, Vol. 102, No. ST1, pp. 1-18,1976.
Takeda, T., M.A. Sozen and N.N. Nielsen, "Reinforced Concrete Response to Simulated Earthquakes," Journal of the Structural Division, ASCE, Vol. 96, No. ST12, December 1970, PP.2557-2573.
Priestley, MJ. Nigel and Jian Ren Tao, "Seismic Response of Precast Prestressed Concrete Frames with Partially Debonded Tendons." PCI Journal, Vol. 38, No. 1, January/February 1993, pp. S8-69. DOI: https://doi.org/10.15554/pcij.01011993.58.69
MacRae, G.A., MJ. Nigel Priestley and Jian Tao, "P-6. Design in Seismic Regions," University of California, San Diego, Structural Systems Research Project, Report No. SSRP 93105, May 1993, 115 pp.
Wong, P.K.C., MJ.N. Priestley and R. Park, "Seismic Resistance of Frames with Vertically Distributed Longitudinal Reinforcement in Beams," ACI Structural Journal, Vol. 87, No.4, July-August 1990, pp. 488-498. DOI: https://doi.org/10.14359/3110
Collins, M.P. and FJ. Vecchio, "Predicting the Response of Reinforced Concrete Beams Subjected to Shear using the Modified Diagonal Compression Field Theory," ACI Structural Journal, Vol.85, May-June 1988. DOI: https://doi.org/10.14359/2515
Hsu, T.T.C., "Softened Truss Model Theory for Shear and Torsion," ACI Structural Journal, Title No. 85-S56, Nov.-Dec. 1988, pp. 624-635. DOI: https://doi.org/10.14359/2740
Priestley, MJ.N., "Seismic Assessment of Existing Concrete Bridges," in Seismic Assessment and Retrofit of Bridges, University of California, San Diego, Structural Systems Research Project, Report No. SSRP 91/03, July 1991, 84-149.
