On Seismic Response Reduction of Adjacent Frame: Emphasis on the Different Characteristics of Earthquakes

Abstract

Seismic response reduction of adjacent frames with the use of dampers, base isolations, or hybrid controls has been considered in recent years. What makes this to be highly important are the different properties of input earthquake loadings that can lead to different results. In this study, friction dampers and LRB isolators were used as the passive energy absorbers and, accordingly, the performance of such devices subjected to a wide range of earthquake loadings has been studied. Two experimental samples were considered to be used as model verifications. Afterward, the frames were excited by three sets of far-fault, near-fault, and near-fault with pulse records, and then the seismic responses of the frames were evaluated in the forms of displacement, inter-story drift, and acceleration. Subsequently, efficient techniques for implementing passive control devices were proposed. The results showed that the hybrid control strategy (a combination of devices) is the most efficient technique for all three statuses; however, using the base-isolation technique can also lead to acceptable performance. When the height of the frame increases, the role of the damper in the reduction of inter-story drift decreases. Nevertheless, the maximum displacement caused by near-fault with pulse records in the base isolation deceives is the main concern in using such devices. The rate of reduction of structural drift in near-fault with pulse records by using hybrid control was significant so that in 3-, 5-, and 8-story frames this reduction was 77%, 85%, and 87%, respectively.

Enhancing the performance of moment frames using a dumbbell-shaped rocking shear wall with additional devices

“…The in uence of different characteristics of earthquakes on the seismic response of moment frames in which friction dampers and isolators were used, was evaluated. This research showed that a combination of devices is the most effective way to reduce the inter-story drifts [6]. The economic aspects of using low-damage systems and dampers were also researched by comparing three different types of systems in structures considering the probability of needing to demolish a building after undergoing large residual deformations.…”

An Investigation on Seismically Isolated Buildings in Near-Fault Region

“…The structure used was subjected to three sets of NFs, with pulse, NF, and FF records. The analysis results showed that the hybrid control strategy was the most efficient technique for NF with pulse, NF, and FF records [30]. A mega-sub isolation system's seismic response to NF ground motions with velocity pulses were evaluated by Li et al [31].…”