Abstract
Abstract The conventional inelastic response spectra constructed by using the single-degree-of-freedom (SDOF) modal systems representing the relationship of roof translation versus base shear are short of the capability to accurately estimate rotational seismic demands for asymmetric-plan structures. This paper illustrates the inelastic response spectra for one-way asymmetric-plan structures constructed from the two-degrees-of-freedom (2DOF) modal systems. The 2DOF modal system can simultaneously represent the roof translation versus base shear and the roof rotation versus base torque relationships for each vibration mode of any one-way asymmetric-plan structure. Thus, the proposed inelastic response spectra are able to estimate not only the translational but also the rotational seismic demands. This new type of response spectra is named as the T-R response spectra. In order to construct the T-R inelastic response spectra, this research identifies three independent elastic 2DOF modal parameters: vibration...
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