文献类型：期刊文献

英文题名：Behavior of BFRP Tendon Systems Under Cyclic Loading and Its Influence on the Dual-Tube SC-BRB Hysteretic Performance

作者：Xie, Q. Zhou, Z.

第一作者：谢钦

机构：[1] Guizhou Institute of Technology, School of Civil Engineering, China; [2] Southeast University, Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, China

第一机构：贵州理工学院土木工程学院

年份：2021

卷号：2021

外文期刊名：World Conference on Earthquake Engineering proceedings

收录：EI(收录号：20251818343696)

语种：英文

外文关键词：Carbon fiber reinforced plastics - Earthquake effects - Oxidation resistance - Seismic design - Tensile testing

摘要：Basalt fiber-reinforced polymer (BFRP) is an ideal pretensioned tendon material due to its corrosion resistance, light weight and high elongation. BFRP has been applied to the self-centering buckling-restrained brace (SC-BRB). The performance of the pretensioned tendons is critical to the control of the residual deformation of the SC-BRB. However, the current research on the performance of BFRP tendon systems mainly focuses on the long-term dead load; few studies have been conducted on the large strain cycle loading of the pretensioned tendon in the self-centering brace under earthquake action. In addition, during a previous SC-BRB experiment, although the BFRP tendon did not cause anchorage slippage, pretension loss occurred, and the cause was not determined. Considering the above problems, in this paper, cyclic tensile tests were conducted on multiple sets of BFRP tendon systems. The ultimate elongation rate was exceeded 2.5%, and the elastic modulus changed little during the loading process. Based on the experimental results, the pretension loss of SC-BRB was due to the colloid in the anchor being deformed under cyclic loading, and the regression formula of the colloidal deformation of the anchor is established. According to the results of a quasi-static experiment on SC-BRB, the BFRP tendon can provide a reliable self-centering restoring force for the brace. When loaded into the axial deformation at 2.5% displacement angle, the residual deformation of the brace remains effectively controlled, and the accuracy of estimating the pretension loss based on the regression formula of the anchor colloidal deformation is demonstrated. Finally, a rheological model that can accurately describe the hysteresis performance of SC-BRB and consider the pretension loss is established. The hysteretic behavior analysis of SC-BRB that is based on rheological model demonstrates that the anchor colloidal deformation will lead to a decrease in the brace bearing capacity and an increase in the residual deformation and that the effect will strengthen with the increase in the displacement amplitude. ? 2024, International Association for Earthquake Engineering. All rights reserved.