Abstract
GFRP is a kind of carbon fiber composite reinforced material, which has attracted wide attention in the engineering field because of its light weight, high strength, corrosion resistance and so on.The solid plate and shell finite element model of full GFRP truss bridge is established by ABAQUS, and its mechanical characteristics are analyzed. The study shows that the stress of each element is less than the material strength, but the mid-span deflection of the truss bridge exceeds the allowable value of the specification, so three kinds of stainless steel plate layout schemes are considered, and the structural gravity, mid-span deflection change and element stress are compared and analyzed. Finally, it is concluded that the upper and lower stainless steel plate has a great contribution to enhance the vertical stiffness of the GFRP truss bridge. The stainless steel plate largely replaces the upper chord under pressure and the lower chord is pulled. On this basis, the stainless steel plate beam filled between oblique bars is equivalent to the upper and lower chords by using the idea of average equivalence and the principle of equal mass. The finite element software analysis shows that the equivalent error is very small.
Highlights
Bridge engineering has been exposed to the open air for a long time, there are serious structural durability problems in reinforced concrete bridge structures, in which steel corrosion and fatigue are very prominent [1, 2]
If the GFRP profile is used in the whole bridge, the vertical stiffness of the structure is small because of the low elastic modulus of the GFRP material, and the deflection in the middle of the span becomes the main consideration in the design
Figure 3. finite element geometric model diagram material, which leads to the small vertical stiffness of the structure, which is the main reason for limiting the span of GFRP bridge structure
Summary
Bridge engineering has been exposed to the open air for a long time, there are serious structural durability problems in reinforced concrete bridge structures, in which steel corrosion and fatigue are very prominent [1, 2]. GFRP truss bridge is a new type of bridge structure that replaces traditional truss bridge members with members made of carbon fiber composite reinforced materials. Compared with traditional steel or concrete materials, GFRP has better properties of light weight, high strength, corrosion resistance and fatigue resistance, and can meet the requirements of bridge engineering durability and construction speed. The high fiber tensile strength of GFRP material can be brought into full play in the axial stress members of truss bridges, and its compressive strength can generally meet the requirements. The product has good properties, high strength and low density, but it is essentially a kind of composite material, which is quite different from the physical and mechanical properties of traditional materials, especially in the relationship between stress and strain. The relationship between internal force, internal moment and strain is as follows:
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