深圳大学学报（理工版）2025，Vol.42Issue(3)：264-272,9.DOI:10.3724/SP.J.1249.2025.03264
FRP片材水下搭接与加固混凝土柱的力学性能
Mechanical properties of underwater lap bonded FRP sheets and reinforced concrete columns
摘要
Abstract
In recent years,fiber reinforced polymer(FRP)composites have been applied to the strengthening of underwater bridge structures.However,due to the lack of reliable underwater lap-bonding techniques,FRP sheets are only used as a temporary template.In order to investigate the feasibility and mechanism of underwater columns strengthened with lap bonded FRP,100 lap bonded FRP sheets specimens were designed and subjected to tensile test,and the effects of lap epoxy adhesive type,lap length,lap environment on the failure modes and mechanical properties of lap bonded FRP sheets specimens were analyzed.The test results show that with the decrease of the lap length,the lap bonded FRP sheets is prone to peel failure.On the contrary,the specimen is prone to fracture of FRP.When the lap length reaches 100 mm,FRP tensile fracture occurs in all lap bonded FRP sheets,moreover the shear strength of underwater lap bonded specimens can reach more than 70%of that of the onshore lap bonded specimens,demonstrating the feasibility of underwater FRP lap bonding.Based on the optimized impregnating adhesive,six lap bonded FRP sheets reinforced concrete columns,six non-dispersible mortar cylinder specimens and three unreinforced concrete cylinder specimens were prepared and tested under axial compression.FRP fracture occurred outside the lap region for the reinforced specimens,and the ultimate strength of the underwater specimens reached 88.5%of that of the onshore specimens,further confirming the feasibility of underwater lap bonded FRP sheets reinforced columns.This study can provide technical guidance for the engineering application of FRP strengthening in underwater columns.关键词
桥梁工程/纤维增强复合材料/水下搭接/拉伸试验/破坏形态/剪切强度/轴压试验/极限强度Key words
bridge engineering/fiber reinforced polymer(FRP)/underwater lap/tensile test/failure mode/shear strength/axial compression test/ultimate strength分类
建筑与水利引用本文复制引用
王志豪,赵康,魏洋,柳林,张依睿..FRP片材水下搭接与加固混凝土柱的力学性能[J].深圳大学学报（理工版）,2025,42(3):264-272,9.基金项目
National Natural Science Foundation of China(52378244) （52378244）
Natural Science Foundation of Jiangsu Province(BK20231293) 国家自然科学基金资助项目(52378244) （BK20231293）
江苏省自然科学基金资助项目(BK20231293). （BK20231293）
