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Long-term Mechanical Behavior of CFRP-strengthened Steel Members for a Truss Tower
Nakamoto, Daiki,Yoresta, Fengky Satria,Matsui, Takayoshi,Mieda, Genki,Matsuno, Kazunari,Matsumoto, Yukihiro Council on Tall Building and Urban Habitat Korea 2020 International journal of high-rise buildings Vol.9 No.4
This research aimed to clarify the long-term mechanical performance of a steel truss member strengthened by a carbon fiber-reinforced polymer (CFRP) without protective coating through exposure testing. Strengthening and repair methods using CFRP have been developed in recent years; however, there is a lack of durability research for CFRP-strengthened members, especially mechanical performance investigation according to actual exposure testing. In this study, 10 CFRP-strengthening steel specimens were created in 2015, and elastic bending tests were conducted biannually. Eventually, although resin loss occurred due to environmental effects, the mechanical performance of CFRP-strengthened steel was not degraded, and we propose a calculation method of bending stiffness to evaluate the lower value of stiffness for design.