Seismic Fragility Assessment of Special Truss Moment Frames (STMF) Using the Capacity Spectrum Method

Document Type: Research Papers

Authors

1 Associate Professor, Faculty of Civil Engineering, Babol University of Technology

2 Ph.D. Student, Faculty of Civil Engineering, Babol University of Technology

Abstract

Fragility curves represent the probabilities that structural damages, under various levels of seismic excitation, will exceed the specified damage states by means of earthquake intensity damage relations. Conceptual aspects related to seismic vulnerability, damage and risk evaluation are discussed first, together with a short review of the most widely used possibilities for the seismic evaluation of structures. The capacity spectrum method starting from capacity and fragility curves is then discussed. The determination of capacity curves for buildings using a non-linear structural analysis tools is then explained, together with a simplified expeditious procedure allowing the development of fragility curves. Next, the seismic risk of the special truss moment frame (STMF) systems of Tehran, the capital of Iran, is analysed in this paper using the capacity spectrum method. The seismic hazard of the studied area is described by using the reduced 5%-damped elastic response spectra. Significant damage is obtained for mid-rise and high-rise special truss moment frames with a Vierendeel middle panel, because of the buckling and early fracture of truss web members. Special truss moment frames with an X-diagonal middle segment also show a low seismic capacity leading to significant expected damage.

Keywords

Main Subjects


American Institute of Steel Construction (AISC). (2007). Specification for Structural Steel Buildings, Chicago (IL), AISC.
ATC-40. (1996). Seismic evaluation and retrofit of concrete buildings, Report No: SSC 96-01. Applied Technology Council, Vol. 1, Redwood City, CA: Seismic Safety Commission.
Barbat, A.H., Pujades, L.G. and Lantada, N. (2006a). “Performance of buildings under earthquake in Barcelona, Spain”, Computer Aided Civil Infrastructures Engineering, 21(8), 573–593.
Barbat, A.H., Lagomarsino, S. and Pujades, L.G. (2006b). “Vulnerability assessment of dwelling 

buildings”, Oliveira, C.S., Roca, A. and Goula, X. (eds.), Assessing a Managing Earthquake Risk, Dordrecht, the Netherlands, Springer, 115–134.
Basha, H. and Goel, S.C. (1994). Seismic resistant truss moment frames with ductile vierendeel segment. Report No. UMCEE 94-29, Ann Arbor, Department of Civil and Environmental Engineering, University of Michigan.
Basha, H.S. and Goel, S.C. (1995). “Special truss moment frames with vierendeel middle panel”, Engineering Structures, 17(5), 352-358.
Carreno, M.L., Cardona, O.D. and Barbat, A.H. (2007a). “Urban seismic risk evaluation: a holistic approach”, Natural Hazards, 40(1), 137–172.
Carreno, M.L., Cardona, O.D. and Barbat, A.H. (2007b). “Disaster risk management performance index”, Natural Hazards, 41(1), 1–20.
Faccioli, P. (2000). “A nonlinear analysis method for performance-based seismic design”, Earthquake Spectra, 16(3), 573–5924.
Fajfar, P. (2002). “Structural analysis in earthquake engineering- a breakthrough of simplified nonlinear methods”, Proceedings of the 12th European Conference on Earthquake Engineering, London, Paper No. 843.
Freeman, S.A. (1978). “Prediction of response of concrete buildings to severe earthquake motion”, Proceedings of Douglas McHenry International Symposium on Concrete and Concrete Structures, Publication SP-55, Detroit, MI, USA, American Concrete Institute.
Freeman, S.A. (1998). “The capacity spectrum method”, Proceedings of the 11th European Conference on Earthquake Engineering, Paris.
Goel, S.C. and Itani, A.M. (1994). “Seismic-resistant special truss-moment frames”, Journal of Structural Engineering, ASCE, 120(6), 1781-1797.
Hanson, R.D., Goel, S.C. and Berg, G. (1971). Seismic behaviour and design procedure of staggered truss frame system for earthquake loading, Report No. 175, Ann Arbor, Department of Civil and Environmental Engineering, University of Michigan.
HAZUS 99-SR2 (2002). HAZUS technical manual, Vol. 1–3, Washington, DC, Federal Emergency Management Agency, FEMA and National Institute of Building Sciences, NIBS.
Itani, A.M. and Goel, S.C. (1991). Earthquake resistance of open web framing systems, Report No. UMCEE 91-21, Ann Arbor, Department of Civil and Environmental Engineering, University of Michigan.
International Building Code (IBC) (2006). International Codes Council, Falls Church, Whittier, CA, USA.
Longo, A., Montuori, R. and Piluso, V. (2012). “Failure mode control and displacement based design of dissipated truss moment frames: Seismic performance evaluation”, Proceedings of the 15th World Conference of Earthquake Engineering, Lisbon, Portugal.
Milutinovic, Z.V. and Trendafiloski, G.S. (2003). Vulnerability of current buildings, Work Package 4 of RISK-UE Project. European Commission, EVK4-CT-2000-00014.
Shinozuka, M., Feng, M.Q., Kim, H., Uzawa, T. and Ueda, T. (2001). Statistical analysis of fragility curves, Report No. 106-E-7.3.5 and 106- E-7.6. Technical Report MCEER. Department of Civil and Environmental Engineering, University of Southern California.
Structural Analysis Program, SAP (2000). Computers and Structures Inc., Berkeley, California.
Wongpakdee, N., Leelataviwat, S., Goel, S.C. and Liao, W.C. (2012). “Performance-based seismic design and evaluation of Bucklinbg restrained knee braced truss moment frames”, Proceedings of the 15th World Conference of Earthquake Engineering, Lisbon, Portugal.
Yang, T.Y., Yuanjie, Li. and Leelataviwat, L. (2014). “Performance-based design and optimization of buckling restrained knee braced truss moment frame”, Journal of Performance of Constructed Facilities, ASCE, 28(6), A4014007.