Comparison of Far-fault and Near-fault Loading Protocols for Long Links in Eccentrically Braced Frames

There are many methods to investigate the behavior and performance of structural members under earthquake records. One of the most common approaches is the quasi-static cyclic testing, which follows a specific loading protocol. The frequency content of near-fault earthquakes substantially differs from that of far-fault earthquakes, and they typically have large velocity pulses. This difference affects the behavior and demands of structures under near-fault earthquakes. Therefore, separate loading protocols are needed for far-fault and near-fault earthquakes. For long links a loading protocol for far-fault earthquakes exists. Recently, authors proposed a near-fault loading protocol for long links in Eccentrically Braced Frames (EBFs) that incorporates the characteristics of near-fault earthquakes. In this paper, these two protocols are compared. The cumulative distribution function curves of both protocols were compared with the analysis results. Additionally, the distribution of excursions and the demand parameters were examined. The hysteretic responses in numerical simulations under both loading protocols were also investigated. Based on our findings, the proposed near-fault loading protocol more accurately represents the demands and behavior of long links for near-fault earthquakes.

کلیدواژه ها:

Eccentrically Braced Frame ، Long link Beam ، Near-fault Loading Protocol ، Far-fault Loading Protocol