Low cyclic loading tests on steel-timber buckling-restrained braces strengthened with CFRP sheets

被引：0
|
作者：
Jiang H. [1 ,2 ]
Song X. [1 ,2 ]
Gu X. [1 ,2 ]
Tang J. [1 ,2 ]
机构：
[1] Key Laboratory of Performance Evolution and Control for Engineering Structures of China Ministry of Education, Tongji University, Shanghai
[2] Department of Structural Engineering, Tongji University, Shanghai
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2021年 / 42卷 / 08期
关键词：
CFRP sheet; Energy dissipation capacity; Equivalent viscous damping ratio; Low cyclic reversed loading; Steel-timber buckling-restrained brace;
D O I：
10.14006/j.jzjgxb.2019.0603
中图分类号：
学科分类号：
摘要：
To enhance the seismic performance and energy dissipation capacity of glulam timber structures, an innovative type of steel-timber buckling-restrained braces strengthened with CFRP sheets was proposed. Based on the low cyclic loading tests of ten brace specimens, the bearing capacity, failure modes, and energy dissipation capacity of the proposed braces were studied. The effects of restraint ratio, the spacing and number of layers of CFRP sheets were quantified. The test results show that the load-displacement hysteretic curves of the braces with the restraint ratio larger than 3. 5 and with 3 layers of CFRP sheets at a spacing of 50 mm are plump and meet the 200 times the plastic deformation requirement. The increase of restraint ratio and the amount of CFRP sheets can lead to the brace failure modes transferring from the overall instability to local buckling, which improves the performance of the braces. Decreasing the spacing from 100 mm to 50 mm for 3 layers of CFRP sheets can increase the bearing capacity and the cumulative energy dissipation by 13% and 26%, respectively. Increasing the CFRP sheets from 2 to 3 layers at a spacing of 50 mm can increase the bearing capacity and the cumulative energy dissipation by 9% and 19%, respectively. The design method for the restraint ratio based on the moment capacity and that for the spacing and number of layers of CFRP sheets based on the local buckling assumption can be used for engineering practices. © 2021, Editorial Office of Journal of Building Structures. All right reserved.
引用
收藏
页码：136 / 143
页数：7
相关论文
共 18 条
  • [1] KOMATSU K, MATSUOKA H, MANAGER C, Et al., Development of ductile and high-strength semirigid portal frame composed of mixed-species glulams and h-shaped steel gusset joints, Molecular Crystals & Liquid Crystals Science & Technology, 250, 1, pp. 51-62, (2006)
  • [2] CESARE A D, PONZO F C, NIGRO D, Et al., Shaking table testing of post-tensioned timber frame building with passive energy dissipation systems, Bulletin of Earthquake Engineering, 15, pp. 4475-4498, (2017)
  • [3] POPOVSKI M, PRION H, KARACABEYLI E., Shake table tests on single-storey braced timber frames, Canadian Journal of Civil Engineering, 30, 6, pp. 1089-1100, (2003)
  • [4] XIONG Haibei, LIU Yingyang, YANG Chunmei, Et al., Experiment study on lateral resistance of glued-laminated timber post and beam systems, Journal of Tongji University (Natural Science), 42, 8, pp. 1167-1175, (2014)
  • [5] WATANABE A, HITOMI Y, SAEKI E, Et al., Properties of brace encased in buckling-restraining concrete and steel tube, 9th World Conference on Earthquake Engineering, pp. 719-724, (1988)
  • [6] GUO Yanlin, JIANG Leixin, Behavior and application of buckling-restrained braces assembled with section steels, Building Structure, 40, 1, pp. 30-37, (2010)
  • [7] DUSICKA P, TINKER J., Global restraint in ultra-lightweight buckling-restrained braces, Journal of Composites for Construction, 17, 1, pp. 139-150, (2013)
  • [8] JIA M M, YU X H, LU D G, Et al., Experimental research of assembled buckling-restrained braces wrapped with carbon or basalt fiber, Journal of Constructional Steel Research, 131, pp. 144-161, (2017)
  • [9] ZHANG Feng, Study on the seismic performance of steel-timber buckling restrained brace, pp. 37-41, (2015)
  • [10] BLOMGREN H, KOPPITZ J, VALDES A, Et al., The heavy timber buckling-restrained braced frame as a solution for commercial buildings in regions of high seismicity, Proceeding of the 14th World Conference on Timber Engineering (WCTE), (2016)
12