Property Research And Numerical Analysis Of Single Beam Overhead Traveling Crane Strengthened With CFRP

Overhead crane is a kind of equipment used for lifting and conveying materials between workshops, warehouses and stock ground. It looks like a bridge with its ends set on tall concrete pillars or metal frames. The bridges of the overhead crane can move along the rails, therefore it can make full use of the space below and won’t be hindered by surface equipments. Overhead crane is the most widely used lifting equipment.Overhead crane takes the bridge-shaped metal structure as its bearing component. The metal structure is the framework of the crane. Through the aggregate motion of hoisting mechanism, trolley running mechanism and crane traveling mechanism, the overhead crane can lift and convey materials in a boxlike space within a fixed span. Therefore the metal structure must have enough strength, rigidity and stability. Strength determines the bearing capacity of the bridge which is essential for the safe operation of the crane. Rigidity ensures that the bridge won’t deform too much under required conditions. If the rigidity is too small, the deflection of the bridge will be so large that the trolley will slip or slide. This will affect the operation of the crane. And stability can ensure that the bridge won’t lose balance under required conditions.This paper studies ways to reduce the excessive deflection of the bridge caused by increase of rated load. We used carbon fiber as reinforcement material. First we got the control differential equations of the interfacial stress of the reinforced steel beam through analytical analysis. Then by geometric and material dual nonlinear analysis—a kind of numerical analysis, we found out the changes of both deflection and ultimate interior tense of the bridge in several different reinforcement cases. The research shows that both deflection and ultimate interior tense of the bridge have reduced after the application of reinforcement. It shows that the results vary with the carbon fiber used. The reinforcement used carbon fiber lattice is the best, as the reduction is the most substantial. Through the numerical analysis we know that the interfacial stress is large only in a short part of the girder ends after reinforcement, and decreases rapidly with the greater the distance from the girder ends.With the development of the times, the requirements on the hoisting capacity and safety performance of the crane become higher. Considering the scarcity of social resources and economy of engineering construction, these bridge cranes can’t be labeled as out of service just because the requirements on hoisting capacity increase. Therefore we can reinforce the metal bridge of the overhead crane to extend its service life and ensure its safe operation, thus avoiding waste of resources.