Seismic Fragility Analysis and Retrofit of Conventional Residential Wood-Frame Structures in the Central United States
Publication: Journal of Structural Engineering
Volume 135, Issue 3
Abstract
Site-built wood-frame (light-frame) construction is the most common form of construction for residential structures in the United States. Such structures have suffered significant damage in recent earthquakes, and wood-frame construction practices in the western United States (WUS) have improved considerably in the last . On the other hand, little is understood about the expected performance of wood-frame structures located in the central and eastern United States (CEUS), where the seismicity is moderate compared to the WUS and construction practices seldom provide earthquake resistance. This paper examines the seismic performance of typical one- and two-story wood-frame structures in the CEUS. Six structures with two foundation types were considered, for which conditional limit state probabilities (fragilities) were evaluated considering three possible failure mechanisms: excessive interstory drift, wall uplift, and sill plate splitting. This examination shows that seismic damage to wood-frame structures in the CEUS under earthquakes of moderate intensity is unlikely to lead to loss of life, but may result in significant financial losses. An evaluation of two possible retrofit strategies illustrates how the expected seismic performance of the CEUS structures can be improved by adding more anchor bolts and perimeter sheathing nails to the shear walls.
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Acknowledgments
The research reported herein was conducted under the sponsorship of the Mid-America Earthquake (MAE) Center with additional support from Texas A&M University and Georgia Tech. This support is gratefully acknowledged. The MAE Center is a National Science Foundation Engineering Research Center funded at the University of Illinois at Urbana-Champaign by Award No. NSFEEC-9701785. The views expressed herein are those of the writers and may not reflect the views of the sponsors.
References
Akinson, G., and Boore, D. (1995). “New ground motions relations for eastern North America.” Bull. Seismol. Soc. Am., 85, 17–30.
American Forest and Paper Association (AF&PA). (2005). National design specification (NDS) for wood construction, Washington, D.C.
Bracci, J. M., Stromatt, R. F., and Pollock, D. G. (1996). “Seismic performance of confined sill plate connections.” J. Struct. Eng., 122(11), 1357–1363.
Cornell, C. A., Jalayer, F., Hamburger, R. O., and Foutch, D. A. (2002). “Probabilistic basis for the 2000 SAC Federal Emergency Management Agency steel moment frame guidelines.” J. Struct. Eng., 128(4), 526–533.
Dean, P. K., and Shenton, H. W., III. (2005). “Experimental investigation of the effect of vertical load on the capacity of wood shear walls.” J. Struct. Eng., 131(7), 1104–1113.
Ellingwood, B. R., Rosowsky, D. V., and Pang, W. C. (2008). “Performance of light-frame wood residential construction subjected to earthquakes in regions of moderate seismicity.” J. Struct. Eng., 134(8), 1353–1363.
Ellingwood, B. R., and Wen, Y. K. (2005). “Risk-benefit based design decisions for low probability/high consequence earthquake events in Mid-America.” Prog. Struct. Eng. Mater., 7(2), 56–70.
Federal Emergency Management Agency (FEMA). (2000). “Prestandard and commentary for the seismic rehabilitation of buildings.” FEMA 356, Washington, D.C.
Fernandez, J. A., and Rix, G. J. (2006). “Soil attenuation relationships and seismic hazard analyses in the upper Mississippi embayment.” Proc., 8th US National Conf. on Earthquake Engineering, EERI, San Francisco.
Fischer, D., Filiatrault, A., Folz, B., Filiatrault, B., Uang, C.-M., and Seible, F. (2001). “Shake table tests of a two-story woodframe house.” CUREE Rep. No. W-06, Task 1.1.1, Consortium of Univ. for Research in Earthquake Engineering, Richmond, Calif.
Folz, B., and Filiatrault, A. (2001). “Cyclic analysis of wood shear walls.” J. Struct. Eng., 127(4), 433–441.
Folz, B., and Filiatrault, A. (2004a). “Seismic analysis of woodframe structures I, Model formulation.” J. Struct. Eng., 130(9), 1353–1360.
Folz, B., and Filiatrault, A. (2004b). “Seismic analysis of woodframe structures. II: Model implementation and verification.” J. Struct. Eng., 130(9), 1426–1434.
Fonseca, F., Rose, S., and Campbell, S. (2002). “Nail, wood screw, and staple fastener connections.” CUREE Rep. No. W-16, Task 1.4.8.1, Consortium of Univ. for Research in Earthquake Engineering, Richmond, Calif.
Frankel, A., et al. (1996). “National seismic hazard maps: Documentation.” USGS Open-File Rep. No. 96–532, USGS, Denver.
Gomberg, J., and Schweig, E. (2007). “Earthquake hazard in the heart of the homeland—Understanding earthquake hazards in the Central United States.” USGS Fact Sheet 2006–3125, ⟨http://pubs.usgs.gov/fs/2006/3125/⟩ (Sept. 2006).
Hajjar, J. F., and Elnashai, A. S. (2006). “Models for seismic vulnerability in the mid-America earthquake center.” Proc., 8th US National Conf. on Earthquake Engineering, EERI, San Francisco.
International Conference of Building Officials (ICBO). (2001). Guidelines for seismic retrofit of existing buildings, International Code Council, Whittier, Calif.
Johnston, A. R., Dean, P. K., and Shenton, H. W., III. (2006). “Effect of vertical load and hold-down anchors on the cyclic response of wood framed shear walls.” J. Struct. Eng., 132(9), 1426–1434.
Kim, J. H., Kent, S. M., and Rosowsky, D. V. (2006). “The effect of biological deterioration on the seismic performance of woodframe shearwalls.” Comput. Aided Civ. Infrastruct. Eng., 21(3), 205–215.
Kim, J. H., and Rosowsky, D. V. (2005). “Fragility analysis for performance-based seismic design of engineered wood shearwalls.” J. Struct. Eng., 131(11), 1764–1773.
Luco, N., and Cornell, C. A. (2007). “Strucuture-specific scalar intensity measures for near source and ordinary earthquake ground motions.” Earthquake Spectra, 23(2), 357–392.
Olshansky, R. B., and Wu, Y. (2004). “Evaluating earthquake safety in mid-American communities.” Nat. Hazards Rev., 5(2), 71–81.
Porter, K. A., et al. (2002). “Improving loss estimation for woodframe buildings.” CUREE Rep. No. W-18, Tasks 4.1 and 4.2, Consortium of Univ. for Research in Earthquake Engineering, Richmond, Calif.
Rosowsky, D. V., and Ellingwood, B. R. (2002). “Performance-based engineering of wood frame housing: A fragility analysis methodology.” J. Struct. Eng., 128(1), 32–38.
Wen, Y. K., Ellingwood, B. R., and Bracci, J. M. (2004). “Vulnerability function.” Technical Rep. No. DS-4, Mid-America Earthquake Center, Univ. of Illinois, Champaign, Ill.
Wen, Y. K., and Wu, C. L. (2001). “Uniform hazard ground motions for Mid-America cities.” Earthquake Spectra, 17(2), 359–383.
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© 2009 ASCE.
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Received: Jan 30, 2008
Accepted: Sep 15, 2008
Published online: Mar 1, 2009
Published in print: Mar 2009
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