Experimental Study on the Seismic Behavior of Replaceable Shear Links Connected to Coupling Beam

Abstract

Abstract    A seismic device for steel core frames of high-rise buildings has been developed. The system consists of two concentrically brace frames connected with coupling beams and shear links. The shear link has been designed to yield and dissipate the energy while the coupling beam and other elements of the frames remain elastic. The experimental work had been conducted on a model of halfscale sub-assemblage of core steel frame with its links made in Japan and Indonesia. The result of testing using a prescribed cyclic loading (AISC 341-10) showed that there was no indication of buckling nor fracture of the link on the assemblage as its plastic rotation reached 0.08 rad and beyond, and no decreasing strength indicated in the hysteretic curve. At the same time, there was no indication of any damage (yielding, buckling) in coupling beam (web, flange, end-plate, bolts) and column. Yielding is localized only in web and flange of the link. The Indonesian shear link specimen showed higher values of shear resisting force due to the higher value of its material yield-strength as compared to the Japan link specimen. However, both specimens showed the same ductility when they reached the maximum strength with its plastic rotation beyond 0.08 rad. as specified in the code (AISC 341-10).

Experimental study on replaceable shear link on reinforced concrete shear wall

“…Visual inspection after the completion of each testing showed the followings in both end plates of coupling beam and link: (1) no indication of damage on the connecting-surfaces as well as around the perimeter surface of bolt holes, (2) no indication of damage in all bolts, (3) no significant slip occurred on the connected surface, and (4) no permanent distortion observed on coupling beam. Meanwhile, inspection on the RC-wall indicated: (1) a regular but not severe crack pattern, (2) no slip between reinforcing bar and coupling beam to the RC-concrete. Moreover, there was no special technique required during the replacement of link, i.e., removal and installation of links, as shown in Figure 9.…”

“…In this setup, the damage was expected to occur on the shear link only, and the coupling beams as well as other structural elements will not experience yielding. This concept provides easy access and replacement of the link The use of steel coupling beams with replaceable steel shear link in a sub-assembly of a steel-core frame for high-rise buildings has been studied by Kusumastuti, et al [1] and Moestopo, et al [2]. The experimental work showed that the shear link yielded and dissipated energy due to cyclic loading until its maximum strength with its plastic rotation exceeded 0.08 radian, while other elements of core-frame i.e., coupling beam and steel-frame remained elastic.…”

Studi Numerik terhadap Kinerja Web-Bolted Replceable Link pada Struktur Rangka Baja Berpengaku Eksentris

“…Pengaku pada link memiliki keterkaitan dengan gaya geser serta rotasi yang terjadi pada link. Link konservatif dengan penambahan pengaku diagonal mampu menahan gaya lateral yang lebih besar apabila dibandingkan dengan link tanpa pengaku diagonal, serta memiliki kemampuan untuk mendisipasi energi dengan baik [14]. Namun pengaplikasian pengaku diagonal pada elemen replaceable link perlu dikaji lebih lanjut agar perilaku link tetap sesuai kaidahnya yaitu mencapai kondisi plastis setelah diberi beban lateral [4].…”