Modified direct displacement‐based design approach for structures equipped with fluid viscous damper

Abstract

Summary Direct displacement‐based design (DDBD) approach is one of the most effective performance‐based design methods. In this paper, a modified version of DDBD is proposed for the design of structures equipped with fluid viscous damper (FVD) that the effect of higher modes and difference between spectral velocity and pseudo‐spectral velocity are applied in the design process. Different steel moment frames equipped with FVD have been designed using the proposed method, and the achievement of desirable performance level has been evaluated under different earthquake records. For comparison objectives, the performance of the modified method has been compared with the previously proposed DDBD. Although the structures designed using the previously proposed DDBD have achieved the desirable performance level, the peak story drift is significantly less than the target drift and this design approach leads to an expensive overdesign, whereas in the structures designed using the modified DDBD, the peak story drift is close to the target drift and the achievement of desirable performance level has been effectively satisfied. Therefore, the drawback of overdesign has been solved, and the modified version of DDBD can be considered as an effective design approach for structures equipped with FVD.

An improvement of direct displacement-based design approach for steel moment-resisting frames controlled by fluid viscous dampers

“…To achieve a well-designed FVD, the higher mode effects should be considered in the design process. Noruzvand et al (2020) proposed a modified version of DDBD with considering higher mode effects in the design process. They also applied the difference between spectral velocity and pseudo-spectral velocity in the design process of FVD.…”

“…The design steps of DDBD developed in this study for steel moment-resisting frames controlled by linear FVD can be classified as shown in Figure 1. For comparison, DDBD approach modified by Noruzvand et al (2020) has been also reported. More details about these design steps and parameters can be found in Noruzvand et al (2020).…”

“…For comparison, DDBD approach modified by Noruzvand et al (2020) has been also reported. More details about these design steps and parameters can be found in Noruzvand et al (2020). In this study, the design steps of 11 and 12 which deal with determination of the damping coefficients of FVD are revised such that no iteration is needed in the design process.…”

“…Sullivan and Lago (2012) first implemented DDBD for design of new structures controlled by linear FVD. Noruzvand et al (2020) proposed a modified version of DDBD which reduces the damping coefficients of FVD comparing to Sullivan and Lago (2012). In this modified DDBD, two different constants of γ and η are applied in the design of FVD.…”

“…To achieve a well-designed FVD, the higher mode effects should be considered in the design process. Noruzvand et al (2020) developed a modified version of DDBD to apply the higher mode effects and difference between spectral velocity and pseudo-spectral velocity in the design process of FVD. They defined two correction constants for the damping coefficient of FVD that these constants had been determined in a non-classical manner.…”