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Lateral load pattern in pushover analysis

Sun Jingjiang (孙景江)¹, Tetsuro Ono ², Zhao Yangang (赵衍刚) ² and Wang Wei (王威)¹

1. Institute of Engineering Mechanics, China Seismological Bureau, Harbin 150080, China
2. Department. of Architecture, Nagoya Institute of Technology, Nagoya 466-8555, Japan

Abstract: The seismic capacity curves of three types of buildings including frame, frame-shear wall and shear wall obtained by pushover analysis under different lateral load patterns are compared with those from nonlinear time history analysis. Based on the numerical results obtained a two-phase load pattern: an inverted triangle (first mode) load pattern until the base shear force reaches b times its maximum value, V_max, followed by a (x/H)^α form, here b and α being some coefficients depending on the type of the structures considered, is proposed in the paper, which can provide excellent approximation of the seismic capacity curve for low-to-mid-rise shear type buildings. Furthermore, it is shown both the two-phase load pattern proposed and the invariant uniform pattern can be used for low-to-mid-rise shear-bending type and low-rise bending type of buildings. No suitable load patterns have been found for high-rise buildings.

Keywords: pushover analysis; performance-based design; Lateral load pattern; nonlinear time history analysis