Study on the Buckling-Restrained Brace Having High Fatigue Performance

Abstract

A great variety of earthquakes such as the long period and long duration are predicted in the future. A high-performance buckling-restrained brace that is effective for those earthquakes is necessary. The authors have studied the buckling-restrained brace that has high-energy absorption capacities even in the high strain amplitude domain. However, not only the energy absorption capacities but also the fatigue performance is important. Therefore the authors confirm whether the buckling-restrained brace that had high-energy absorption capacities would become high-performance in the fatigue life. As a result, this buckling-restrained brace shows the high fatigue performance at the high strain amplitude domain.

Performance Evaluation of Buckling-Restrained Braces Installed in a Mid-Rise Steel Structure

“…Overview of specimens. The top view and cross section of specimens used in past studies [1][2][3] are presented in Fig. 2.…”

“…At low strain amplitudes, a difference in the maximum number of loading cycles arises between the high-performance type specimen and the basic type specimen depending on the presence or absence of the weld heat-affected zone [2,3].…”

“…To date, many comparative performance tests have been conducted. As a result, the past study proposed equations for finding the lower limit of the performance of the BRBSM based on energy absorption performance [1] and presented its fatigue performance [2,3]. Fig.…”

Proposal and application of structural soundness monitoring system for the buckling‐restrained brace using steel mortar planks

“…Previous studies [16][17][18][19][20][21] presented the conditions for the fracture by conducting tests on the BRBSM choosing parameters such as restraining index, core plate clearance, compressionto-tension strength ratio, shape, and dimensional details. In specimens where the core plate underwent a tensile fracture, the permissible value ω r is the lower limit of the evaluation formula of the cumulative plastic strain energy ratio and is expressed by Eq.…”

“…Authors have been conducting research on BRBs (also, the BRB using steel mortar planks; BRBSM), which are widely used as earthquake-resistant members and seismic-response control members [14][15][16][17][18][19][20][21]. They are prepared by placing the clearance adjustment material on two steel mortar planks (grooved steel filled with mortar) that serve as the restraining part, as indicated in Fig.…”