| Fiber reinforced composite materials do not only have favorable plasticityand structure adaptability but also compared with the steel and alloy and other metalmaterials, have some advantages such as light weight, high specific strength,highstiffness and good corrosion resistance. In recent years, with yield and performance ofGFRP (glass fiber reinforced plastic) improving and molding process matureIncreasing, application of GFRP rapid promotion in civil engineering but as the mainforce bearing member, application and promotion of GFRP have a lot of problems tobe needed to solved in the field of bridge engineering such as structural style,manufacturing process, material design and component connection method etc.In this paper, the more extensive GFRP that is produced with pultrusion processand contains70%E-glass fibers is extended and compressed test, obtain the truematerial properties.With finite element analysis software and depend on GFRP material characteristics,optimum GFRP composite structure is designed. With the structure, a simply supportedbeam bridge is designed which is span of40meters, four-lane and withstand road levelloads. Detailed dimensions and parameters of the bridge are gave.The strength andstiffness and stability of the bridge are checked. By surveying market price of theGFRP profiles and statistics bridge GFRP materials consumption, the results indicatethat economic practicality of the bridge is better.For the designed and researched GFRP composite structure in this paper, areasonable connection structure is designed and connection properties and failuremechanism of different connection methods are compared and analyzed. The resultsshowed that：①Failure mode of GFRP and steel glued component is layer occurs shearfailure and cause the connection failure. Failure modes of GFRP and steel boltedconnection is shear stress appear concentrate around bolt hole and shear stress ofGFRP plate is too much around the bolt hole which lead to shear failure. Failure modeof GFRP and steel hybrid connection is also GFRP plate shear failure around the bolthole.②From the point of the connection strength： hybrid connection>boltedconnection>glued component. From the point of the connection stiffness: hybridconnection>glued component>bolted connection. From the point of the connectionductility：hybrid connection>bolted connection>glued component.③In the hybrid connection, stress state of bolt is divided into three stages:①Before plastic zone oflayer generating, the force is little withstood by bolt, load is withstood almost entirelyby the layer.②After plastic zone of layer generating and before the plastic zone extendgradually to the bolt hole, the force is withstood by bolt begin to become larger, but itis still not major force component.③After plastic zone of layer extend to the bolt hole,bolts bear significantly larger loads.Furthermore, since the complexity and particularity of GFRP materials and hybridconnection, effects of some factors which have significant impact on bolted connectionor glued component pairs hybrid connection remains to be further studied, such as thenumber of bolts and end distance.By finite element analysis, the results showed that：①Increasing the number ofbolts will help to improve strength of hybrid connection but the effect is more remote,and the number of single row of bolts not more than three.②Before plastic zone oflayer generating, the number of bolts pairs the stiffness of hybrid connection has littleaffects. After plastic zone of layer generating, more bolts and higher stiffness and thenumber of bolt is not proportional to the stiffness of hybrid connection.When a singlerow quantity of bolts more than three, the impact of the number of bolts on theconnection stiffness is negligible.③End distance has no effect on the strength of hybridconnection, but the effect on the stiffness is more significant. |
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