Development of detachable replaceable links for eccentrically braced frames

Bozkurt, Mehmet Bakir
Azad, Sina Kazemzadeh
Topkaya, Cem
Eccentrically braced frames (EBFs) can be repaired after a major earthquake by replacing the links. The link replacement is not a straightforward process and is influenced by the type of the link and the amount of residual frame deformations. The past decade has witnessed the development of different types of replaceable links such as end-plated links, web connected links, bolted flange and web spliced links, and collector beam and brace spliced links. All of the developed replaceable link details, except the web connected links, are not suitable for link replacement under residual frame drift. In this paper, a detachable replaceable link detail which is based on splicing the link at its mid-length is proposed. The detail is well suited for installation under residual frame drifts. In addition, the weight and size of the members to be transported and erected are reduced significantly, thereby facilitating the replacement procedure. Performance of this proposed replaceable link is studied by conducting six nearly full scale EBF tests under quasi-static cyclic loading. The link length ratio, type of end-plated mid-splice connection, and the amount of residual drift are considered as test variables. The test results revealed that the inelastic rotation capacity of the detachable replaceable links exceeds the requirements of the AISC Seismic Provisions for Structural Steel Buildings. No failures are observed in the end-plated mid-splice connections demonstrating the potential of the proposed details. The detachable replaceable links are investigated by numerical analysis as well to further validate their applicability and to develop design recommendations.


Mid-spliced end-plated replaceable links for eccentrically braced frames
Özkılıç, Yasin Onuralp; Bozkurt, Mehmet Bakır; Topkaya, Cem (2021-06-15)
Eccentrically braced frames (EBFs) can be re-used after a major seismic event by replacing the link members. Recent years have witnessed the development of numerous replaceable links. Among various details developed for this purpose, extended end-plated replaceable links are found to be the most efficient. The use of these links enables the engineer to minimize the size and the weight of the part to be replaced. In addition, the performance of end-plated links is similar to that of conventional links. Resea...
Experimental and numerical studies on replaceable links for eccentrically braced frames
Özkılıç, Yasin Onuralp; Topkaya, Cem; Department of Civil Engineering (2020)
Eccentrically braced frames (EBFs) are extensively used as a steel lateral load resisting systems in high seismic regions since EBFs simulate ductility and high energy absorption capacity of moment resisting frames (MRFs) and high stiffness of concentrically braced frames (CBFs). High stiffness and high ductility of EBFs are obtained from diagonal braces and yielding of link element, respectively. This thesis reports findings of a three phase experimental and numerical research program on replaceable links ...
Numerical investigation of braces and replaceable links for steel frames
Kazemzadeh Azad, Sina; Topkaya, Cem; Department of Civil Engineering (2021-2-10)
Concentrically braced frames (CBFs) and eccentrically braced frames (EBFs) are among popular lateral load resisting systems for steel structures. The present study investigates different aspects of these systems. The part devoted to EBFs begins with a comprehensive review of research where 22 future research needs are identified and presented. This is followed by an experimental study on the low-cycle fatigue behavior of links, which are the most important members of an EBF. Results of the experimental stud...
Strengthening of reinforced concrete frames with engineered cementitious composite panels
Ayatar, Mehmet Engin; Canbay, Erdem; Binici, Barış (Thomas Telford Ltd., 2020-04-01)
Infill walls in reinforced concrete frames are susceptible to failure owing to their brittle nature. Their interaction with boundary columns during earthquakes may also cause shear damage in the columns. It is crucial to employ effective seismic strengthening strategies in order to mitigate the seismic risk induced by the infill walls. In this study, a new strengthening technique, conducted by bonding engineered cementitious composite (ECC) precast panels onto infill walls, was investigated. Three reinforce...
Splice Connection Details for Eccentrically Braced Frame Replaceable Links
Topkaya, Cem (null; 2019-09-20)
Eccentrically braced frames (EBFs) can be used as a lateral load resisting system in seismic prone regions. A typical EBF consists of links, beams, columns and braces. Links are the fuse members providing energy dissipation during an earthquake. After a seismic event, damaged links need to be replaced with the new ones to recover initial stiffness and ductility of the structure. A comprehensive experimental research program has been undertaken to develop new replaceable link details. One of the proposed det...
Citation Formats
M. B. Bozkurt, S. K. Azad, and C. Topkaya, “Development of detachable replaceable links for eccentrically braced frames,” EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS, pp. 1134–1155, 2019, Accessed: 00, 2020. [Online]. Available: