The Effect of Seismic Design Methods on Design Eccentricities in Building with Planar Irregularities

Abstract:

Seismic provisions have utilized design eccentricities to reduce planar irregularities in lateral stiffness of buildings. In calculating a design eccentricity, the dynamic amplification factor may be applied either to accidental eccentricity or to both inherent and accidental eccentricities according to design codes. In this paper, different code provisions and their impact on torsional responses of buildings are investigated using example buildings with various aspect ratios and eccentricities. It was found that dynamic amplification is underestimated if the inherent eccentricity is small, when buildings are designed by seismic provisions using dynamic amplification factors for both to inherent and accidental eccentricities. On the other hand, the design eccentricity determined by applying the dynamic amplification factor only to accidental eccentricity reflects torsional amplification accurately.

• Periodical: Applied Mechanics and Materials (Volumes 764-765)
• Pages: 1149-1153
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.764-765.1149
• Online since: May 2015
• Authors: Kwang Ho Lee, Seong Hoon Jeong, Seung Woo Han, Kang Su Kim*
• Keywords: Accidental Eccentricity, Design Codes, Inherent Eccentricity, Torsional Amplification Factor

References

[1] Architectural Institute of Korea: Korean building code, KBC (2009).

[2] American Society of Civil Engineers: Minimum design loads for buildings and other structures, ASCE 7 (2010).

[3] Structural Engineers and Association of California: Recommended lateral force requirements and commentary (1988).

[4] International Conference of Building Officials: Uniform building code, UBC (1997).

[5] Federal Emergency Management Agency: NEHRP guidelines for the seismic rehabilitation of buildings, FEMA 273 (1997).

[6] Federal Emergency Management Agency: NEHRP recommended provisions for seismic regulations for new buildings and other structures, FEMA 302 (1997).

[7] Federal Emergency Management Agency: Prestandard and commentary for the seismic rehabilitation of buildings, FEMA 356 (2000).

[8] Federal Emergency Management Agency: NEHRP recommended provisions for seismic regulations for new buildings and other structures, FEMA 368 (2000).

[9] Architectural Institute of Korea: Korean building code, KBC (2006).

[10] Federal Emergency Management Agency: NEHRP recommended provisions: Design examples, FEMA 451 (2006).

[11] K.M. Dempsey and W.L. Tso: Int J Soil Dynam Earthquake Eng Vol. 1(1) (1982), pp.3-10.

[12] A.M. Chandler and G.L. Hutchinson: EARTHQ ENG STCUCT D Vol. 15(4) (1987), pp.419-516.