FRP-鋼板復(fù)合材料基本力學(xué)性能和耐久性能研究
[Abstract]:Fiber Reinforced Polymer (FRP) is widely used in structural reinforcement because of its lightweight, high strength and other advantages. However, the brittleness of the structure strengthened by FRP is remarkable, which is not conducive to the seismic performance of the structure. A new kind of composite material, FRP-steel plate composite material, is developed by mixing FRP and steel plate. This new composite material can give full play to the complementarity of mechanical properties between FRP and steel plate and significantly improve the strength, ductility and stiffness of a single reinforcement material. The static tensile properties of FRP-steel sheet composites, the interfacial bond between FRP and steel sheet under temperature, and the durability of FRP-steel sheet composites under alternate wet-dry aging mainly include the following aspects:
1. Static tensile tests were carried out on 36 FRP-steel composite specimens. The basic mechanical properties of FRP-steel composite were studied. The influencing factors included fiber types (carbon fiber, glass fiber and basalt fiber), fiber layers, steel plate thickness and fiber laying methods. The CFRP-steel sheet composites formed by laying not only have higher strength but also better plasticity; the GFRP-steel sheet composites formed by mixing GFRP and steel sheet have better ductility after yield; (2) When the number of layers of FRP is fixed, with the increase of the thickness of steel sheet, the FRP-steel sheet composites are basically the same. The mechanical properties of FRP-steel sheet composites are enhanced, but the extent of reinforcement decreases gradually, and the reduction rate increases when the thickness of steel sheet exceeds 4 mm. (3) The more symmetrical and uniform the laying mode between FRP and steel sheet, the better the mechanical properties of FRP-steel sheet composites. According to the experimental results, the stress-stress of FRP-steel sheet Composites is established by using the mixing rule in composite mechanics. The theoretical value is in good agreement with the experimental data.
2. Static tensile tests were carried out on 66 CFRP-steel plate composites and GFRP-steel plate composites at 30 120 C. The results show that the basic mechanical properties of FRP-steel plate composites decrease with the increase of temperature, and the glass transition temperature of bonding colloid decreases greatly near 50. In this paper, the formulas for calculating the elastic modulus, post-yield modulus, yield strength and fiber fracture strength of FRP-steel sheet composites under the action of temperature are presented. The calculated results are in good agreement with the experimental results.
3. The interfacial bonding between FRP and steel sheet was studied by 153 specimens of FRP and steel sheet under the temperature range of 30 ~120 C. According to different research purposes, two kinds of two-way shear models were used to study the interfacial bonding between FRP and steel sheet. The ultimate strength and bond stiffness of FRP and steel plate bi-directional shear model I specimens decrease gradually with the increase of temperature, and the rate of decrease is larger near the glass transition temperature of bond colloid. According to the test results, the mechanical properties of bond colloid under the action of temperature are combined. Based on the modified Arrhenius equation, a formula for calculating the degradation of bond stiffness between FRP and steel plate is presented. The results are in good agreement with the experimental results. (2) The experimental results of two-way shear model II of FRP and steel plate show that: 1) the ultimate strength of two-way shear model II decreases with the increase of temperature. The failure modes of FRP and steel plate bi-directional shear model II specimens are mainly the peeling failure of FRP and steel plate under the action of temperature; 3) Based on the study of the results of the bond interface between FRP and concrete, the bond shear stress-slip relationship model of FRP and steel plate under the action of different temperatures is established, and the bond shear stress-slip relationship between FRP and steel plate under the action of different temperatures is proposed. The formula for calculating ultimate bearing capacity of steel plate is calculated, and the calculated value is compared with the experimental value.
4. The durability of CFRP-steel sheet composites was studied by 120 specimens under alternating wetting and drying. The results show that: (1) alternating wetting and drying have great influence on the yield strength and fiber fracture strength of unilateral CFRP-steel sheet composites, but little influence on elastic modulus and post-yield modulus of steel sheet; (2) alternating wetting and drying have great influence on both sides of the composites. The yield strength, fiber breaking strength, elastic modulus and post-yield modulus of CFRP-steel sheet composites have great influence. (3) The degradation rate of mechanical properties of CFRP-steel sheet composites with both sides is higher than that of CFRP-steel sheet composites with one side. The calculation model of static tensile properties of CFRP-steel plate composites is used to predict and analyze the basic mechanical properties loss of CFRP-steel plate composites under alternating wet and dry environments. The calculated results of the model are in good agreement with the experimental results. Prediction and analysis of service life under the environment.
【學(xué)位授予單位】:武漢大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2014
【分類號(hào)】:TU599
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