Abstract
Spectral floor-acceleration demands are necessary for the seismic design of acceleration-sensitive non-structural components (NSCs). Existing studies to estimate floor response spectra (FRS) using empirical equations are based on elasto-plastic and stiffness degrading hysteretic behavior of the primary structure. In the present study, the FRS for self-centering (SC) structural systems with flag-shaped hysteretic behavior under far-fault ground motions are investigated. The FRS and dynamic amplification factor (DAF) are obtained from nonlinear response history analysis (NLRHA) of SC structural systems with flag-shaped hysteretic behavior. An equation to estimate the FRS is proposed and verified by carrying out NLRHA using a different set of far-fault ground motions. The equation to estimate FRS is shown to predict floor acceleration demands with very good accuracy.
Highlights
The adoption of seismic design has greatly reduced the damage to the structural elements of buildings
Damage to secondary structural elements and non-structural components (NSCs) can lead to huge economic losses, due to associated loss of functionality of important facilities and business downtime after a major earthquake. Existing building codes such as Eurocode 8 [6] and ASCE 7-16 [7] provide expressions to determine the acceleration demand for the estimation of seismic design force for acceleration-sensitive NSCs, several studies have shown that the peak floor acceleration and floor response spectra (FRS) estimated from such codes are not accurate
Estimation of FRS using empirical equations based on a single-degree-of-freedom (SDOF) system for the primary structure have been reported in previous studies
Summary
The adoption of seismic design has greatly reduced the damage to the structural elements of buildings. The FRS for SC structural systems with flag-shaped hysteretic behavior under far-fault ground motions are investigated. 2. Self-Centering (SC) SDOF System with Flag-Shaped Hysteretic Behavior, Ground Motion Records, and Numerical Modeling. Even though R = 6 or 7 is used for the design of self-centering structural systems using the force-based design method (Smith et al [22], Buddika and Wijeyewickrema [24]), a wide range of R values are adopted in this study.
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