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 Structural behavior of steel-truss diagonal tension members strengthened with CFRP sheets
Tác giả hoặc Nhóm tác giả: Ngoc Vinh Pham*, Kazuo Ohgaki, Takeshi Miyashita, Masafumi Hattori, Yuya Hidekuma, Ngoc Quang Pham
Nơi đăng: Journal of Constructional Steel Research (SCIE-Q1); Số: 227 (2025) 109319;Từ->đến trang: 1-21;Năm: 2025
Lĩnh vực: Chưa xác định; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
This study assessed the efficacy of strengthening techniques that employ carbon fiber-reinforced polymer (CFRP) to enhance the structural performance of aging steel-truss bridge diagonal tension members. A combination of loading tests and nonlinear finite element (FE) analyses were performed. The investigation focused on two specific methods (Methods A and B), which involved bonding CFRP sheets to both sides of the flanges to address inadequate CFRP anchoring near the gusset-plate connections. In Method A, the CFRP sheets were applied outside the area of the gusset-plate connections, while in Method B, CFRP sheets were bonded in the direction of the gusset-plate connections. The findings confirmed a substantial enhancement in initial tensile stiffness, yield strength (27 %), and load-bearing capacity (51 %) in the CFRP-strengthened specimens owing to their improved stress-transfer effectiveness. The developed FE models accurately predicted the structural behavior of the strengthened specimens and provided insights into the operational mechanics of the proposed strengthening methods. Furthermore, a parametric analysis indicated a linear increase in the stiffness, yield strength, and ultimate load-bearing capacity of the strengthened diagonal tension members as the number of CFRP layers increased. Method B exhibited superior strengthening effectiveness compared to Method A and exhibited performance similar to that of the conventional method featuring adequate CFRP anchoring. Additionally, equations were proposed to predict the yield strength and ultimate load-bearing capacity of the strengthened diagonal tension members with actual cross-sectional dimensions. Hence, the study provided practical solutions to enhance the performance of aging infrastructure, thereby satisfying a crucial need in civil engineering practice.
ABSTRACT
This study assessed the efficacy of strengthening techniques that employ carbon fiber-reinforced polymer (CFRP) to enhance the structural performance of aging steel-truss bridge diagonal tension members. A combination of loading tests and nonlinear finite element (FE) analyses were performed. The investigation focused on two specific methods (Methods A and B), which involved bonding CFRP sheets to both sides of the flanges to address inadequate CFRP anchoring near the gusset-plate connections. In Method A, the CFRP sheets were applied outside the area of the gusset-plate connections, while in Method B, CFRP sheets were bonded in the direction of the gusset-plate connections. The findings confirmed a substantial enhancement in initial tensile stiffness, yield strength (27 %), and load-bearing capacity (51 %) in the CFRP-strengthened specimens owing to their improved stress-transfer effectiveness. The developed FE models accurately predicted the structural behavior of the strengthened specimens and provided insights into the operational mechanics of the proposed strengthening methods. Furthermore, a parametric analysis indicated a linear increase in the stiffness, yield strength, and ultimate load-bearing capacity of the strengthened diagonal tension members as the number of CFRP layers increased. Method B exhibited superior strengthening effectiveness compared to Method A and exhibited performance similar to that of the conventional method featuring adequate CFRP anchoring. Additionally, equations were proposed to predict the yield strength and ultimate load-bearing capacity of the strengthened diagonal tension members with actual cross-sectional dimensions. Hence, the study provided practical solutions to enhance the performance of aging infrastructure, thereby satisfying a crucial need in civil engineering practice.
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