Effect of composite action on seismic response of steel structures with dampers designed by the DDBD method

Alehojjat, Seyed Behdad; Yakhchalian, Masood; Bahar, Omid

doi:10.48303/jsee.2024.2034260.1110

Effect of composite action on seismic response of steel structures with dampers designed by the DDBD method

Articles in Press

Document Type : Research Article

Authors

Seyed Behdad Alehojjat ¹

Masood Yakhchalian ¹

Omid Bahar ²

¹ Department of Civil Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran

² IIEES

10.48303/jsee.2024.2034260.1110

Abstract

This paper investigates two important engineering demand parameters for seismic performance

assessment of steel moment resisting frames equipped with linear fluid viscous dampers designed

using the modified direct displacement-based design (DDBD) method. These parameters include

the inter-story drift ratio (IDR) and the residual inter-story drift ratio (RIDR). For this aim,

nonlinear dynamic time history analyses are performed at two seismic hazard levels, involving the

design basis earthquake (DBE) and the maximum considered earthquake (MCE). The effects of

panel zone flexibility and gravity framing are modeled in the analyses. In addition, the effect of

considering and neglecting composite action on gravity framing and beam elements in moment

resisting frames is investigated. The results show that in both cases, the structures designed using

the modified DDBD method could acceptably meet the performance target IDR limit.

Additionally, it is shown that accounting for the effect of composite action leads to a reduction of

about 4% in the maximum value of mean IDRs at both the DBE and MCE hazard levels. However,

an increase of up to 12% is obtained for the maximum value of median RIDRs at the MCE level

when the composite action is considered.

Keywords

Direct displacement-based design

inter-story drift ratio

residual inter-story drift ratio

composite action

linear fluid viscous damper

Subjects