Experimental Investigation of Seismic Performance of Three-core buckling restrained braces

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Chigoi Ali; RAHGOZAR MOHAMMAD ALI; Izadinia Mohsen

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Journal Paper

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Journal: Modares Civil Engineering journal Year:2020 | Volume:20 | Issue:5 Page(s): 37-48

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Information Journal Paper

Title

Experimental Investigation of Seismic Performance of Three-core buckling restrained braces

Author(s)

Chigoi Ali | RAHGOZAR MOHAMMAD ALI | Izadinia Mohsen | Issue Writer Certificate

Keywords

Buckling

single core brace

three core brace

hysteresis cycle

Abstract

As a passive control system, braces have an effective role in creating structural resistance to lateral forces such as earthquakes and winds. One of the ways to make the braces more economical is to use their inelastic capacity. Ordinary braces perform well in tension,however they buckle under pressure and exhibit undesirable behavior. This problem can reduce dissipated energy due to lack of plasticity, which plays an important role in cyclic loading such as earthquakes. For this reason, Buckling-restrained brace (BRB) have become increasingly popular in different countries. BRBs include yielding steel core and an outer steel hollow section. Although the yielding steel core has a low compressive capacity, its capacity in pressure can be increased by limiting its Buckling due to the outer steel hollow section. In general, Buckling-restrained-braces have three zones. An unrestrained elastic zone, a restrained elastic zone, and a restrained plastic zone. The unrestrained elastic zone is designed to provide a connection between the BRB and the Gusset Plate. When the plastic zone yields under pressure and tension demands, the unrestrained elastic zone resists axial forces without Buckling. The restrained plastic zone is a transition part of the core plate between elastic and plastic behaviors. Even though under pressure and compression load this zone has elastic behavior, the steel casing prevents it from Buckling. The restrained plastic zone resists tension and compression forces elastically and plastically. The steel core inside the steel casing must be separated and must be able to move freely. Hence, separating or isolating the steel core must be done either using isolation material such as rubber, silicone grease, and foam or by placing an air gap to prevent friction between the steel core and the steel casing and to consequently prevent the additional axial load capacity during compression demands. So far BRBs introduced as mentioned have a single yielding core, however in this paper, in order to improve the seismic behavior of BRBs, Buckling-restrained brace with three parallel cores with different yield stress have been suggested and introduced. The Buckling braces were made in one and three steel core with the same tensile and compressive capacity. These braces were subjected to cyclic tensile and compressive loads in the laboratory under the ATC-24 loading protocol. Hysteresis cyclic performances of each brace were obtained and examined. The experimental results show that: 1) the hysteresis loop of the 3-core brace is thicker and higher than the 1-core brace, 2) indicating that the three core brace has 16. 3% and 8. 8% higher energy absorption and damping capacity, respectively compared to that of the single core brace. Furthermore, it has better seismic performance. Threecore BRBs are better alternatives for single-core BRBs as lateral loading resistance systems, especially for seismic loading with hysteresis loops, because of several reasons. The hysteresis loop of the three-core BRB has a convex shape and a fat loop as compared to the single-core BRB. The hysteresis loops in three-core BRBs have better performance and a fat loop as they move toward a higher drift ratio, especially at 2. 5% drift. The hysteresis loop of the three-core BRB has a more stable behavior than the single-core BRB after 1% drift.

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APA: Copy

Chigoi, Ali, RAHGOZAR, MOHAMMAD ALI, & Izadinia, Mohsen. (2020). Experimental Investigation of Seismic Performance of Three-core buckling restrained braces. MODARES CIVIL ENGINEERING JOURNAL, 20(5 ), 37-48. SID. https://sid.ir/paper/1036851/en

Vancouver: Copy

Chigoi Ali, RAHGOZAR MOHAMMAD ALI, Izadinia Mohsen. Experimental Investigation of Seismic Performance of Three-core buckling restrained braces. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2020;20(5 ):37-48. Available from: https://sid.ir/paper/1036851/en

IEEE: Copy

Ali Chigoi, MOHAMMAD ALI RAHGOZAR, and Mohsen Izadinia, “Experimental Investigation of Seismic Performance of Three-core buckling restrained braces,” MODARES CIVIL ENGINEERING JOURNAL, vol. 20, no. 5 , pp. 37–48, 2020, [Online]. Available: https://sid.ir/paper/1036851/en

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