Displacement-based seismic design adopts equivalent linearization approach to estimate the maximum inelastic displacement of the structural system. The appropriate equivalent natural period and effective damping are the key points to insure a reliable displacement estimation of the approach. Application comparison of two different equivalent linearization approaches, secant-stiffness approach and 2D searching approach, was mainly carried out in the study when they were applied to displacement-based seismic design methodology. The basic principle of two equivalent approaches and the detailed procedure of displacement-based seismic design methodology were introduced and the design base shear forces were deduced and compared when the two different equivalent approaches were adopted. The influence of two approaches on the seismic design of structures was investigated through a reinforced concrete frame structure design example. Research results indicate that the ratio of design base shear forces that obtained through the two different equivalent linearization approaches is only decided by the structural nonlinear hysteretic model and the ductility coefficient. For the general design case that the ductility coefficient equal to 3.0, the base shear force is amplified by 20% or so when the secant-stiffness approach adopted, and thus the structural seismic design tends to be conservative when compared with the 2D searching approach.
SU Liang, SUO Jing. Comparison of different equivalent linearization approaches applied to displacement-based seismic design methodology. J4, 2013, 47(11): 1926-1931.
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