Seismic Vulnerability of Structures Designed in Accordance with the Allowable Stress Design and Load Resistant Factor Design Methods
The method selected for the design of structures not only can affect their seismic vulnerability but also can affect their construction cost. For the design of steel structures, two distinct methods have been introduced by existing codes, namely allowable stress design (ASD) and load resistant factor design (LRFD). This study investigates the effect of using the aforementioned design methods on the seismic vulnerability and construction cost of steel structures. Specifically, a 20-story building equipped with special moment resisting frame and an eccentrically braced system was selected for this study. The building was designed for three different intensities of peak ground acceleration including 0.2 g, 0.25 g, and 0.3 g using the ASD and LRFD methods. The required sizes of beams, columns, and braces were obtained using response spectrum analysis. Then, the designed frames were subjected to nine natural earthquake records which were scaled to the designed response spectrum. For each frame, the base shear, story shears, and inter-story drifts were calculated and then were compared. Results indicated that the LRFD method led to a more economical design for the frames. In addition, the LRFD method resulted in lower base shears and larger inter-story drifts when compared with the ASD method. It was concluded that the application of the LRFD method not only reduced the weights of structural elements but also provided a higher safety margin against seismic actions when compared with the ASD method.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1130653Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 680
 AISC-ASD 89, Specification for Structural Steel Buildings-Allowable Stress Design and Plastic Design, American Institute of Steel Construction, Inc.
 ANSI/AISC 360-10 (2010), Specification for Structural Steel Buildings, American Institute of Steel Construction, Chicago, IL.
 Eurocode 3: Design of Steel Structures-Part 1-1: General Rules and Rules for Buildings. (2003). Brussels: European Committee for Standardization.
 SEAOC Seismology Committee. (2006). SEAOC Blue Book: Seismic Design Recommendations
 ICBO, Uniform Building Code, International Conference of Building Officials, Whittier, CA, 1991, 1994, 1997.
 ASCE/SEI 7-10, Minimum Design Loads for Buildings and Other Structures, American Society of Civil Engineers, Reston, Virginia.
 ETABS (2015). Computer Program ETABS Ultimate 2015. Computers and Structures Inc., Berkeley, California.
 Tso, W. K., Zhu, T. J., & Heidebrecht, A. C. (1992). Engineering application of ground motion a/v ratio. Soil Dynamic and Earthquake Engineering, 11(3), 133–144
 Vafaei, M., Adnan, A. B., & Rahman, A. B. A. (2014). Seismic performance evaluation of an airport traffic control tower through linear and nonlinear analysis. Structure and Infrastructure Engineering, 10(8), 963-975.
 Moravej, H., Vafaei, M., & Abu, B. (2016). Seismic performance of a wall-frame air traffic control tower. Earthquakes and Structures, 10(2), 463-482.
 ASCE/SEI 41-13 (2013), Seismic Evaluation and Retrofit of Existing Building, American Society of Civil Engineers, Reston, VA.