Displacementbased integrated seismic design of RC frame structure and supplemental energy dissipation devices

Abstract

In energy dissipation structures, the main structure and the supplemental energy dissipation devices are normally designed separately. However, when attempting to realize the desired performance target, iteration becomes indispensable due to the coupling characteristics between the main structure and the supplemental energy dissipation devices. The present paper proposes a displacement-based integrated design approach for both the main structure and the supplemental energy dissipation devices. Firstly, based on the selected ground motion records and desired performance target, the damping ratio demand surface was determined. Secondly, the formulas to compute the parameters of supplemental damper and bracing component were derived. Then, the supporting stiffness and viscosity of the supplemental energy dissipation devices can be obtained through the damping ratio demand surface and the derived formulas based on the general information of the main structure and the desired performance target. Thirdly, a dimensionless cost index was introduced and the minimum cost index was taken as the objective function to identify the optimal design parameters among the parameters which can realize the target performance. Finally, an equivalent SDOF system, MDOF system and a six-story RC frame structure designed by SAP2000 were taken as representative samples to verify the effectiveness of the proposed design approach. The results show that all the energy dissipation structures can achieve the desired performance target.