Mechanical Performance Study on Advanced Type of Wet Joint Bar Connection Structure
To make up for the defects(e.g.,long lap length and high difficulty in binding or welding)of wet joint ordinary bar connection structure of superimposed beam,an advanced L-shaped bar connection method was proposed.The finite element software ANSYS was used to simulate the mechanical performance of superimposed beam wet joints connected with straight bar,circular bar,curved bar and L-shaped bar numerically.The mechanical characteristics,bearing capacity and construction technology of wet joints by using different bar connection methods were compared.The result indicates that under the condition of the same wet joint section size and the same reinforcement ratio,before the wet joint cracking corresponding to 4 types of bar connection methods,the concrete stress and steel bar stress in the non-lapping area are higher than those in the lapped area.The wet joint concrete cracking position is located in the non-lapping area,and the cracking load is close to the theoretical value of cracking load of reinforced concrete axial tension members.The wet joint concrete cracking load with L-shaped bar connection method is almost the same as that with straight bar and curved bar method,but 4%smaller than that with circular bar method.When the wet joints of 4 types of reinforced concrete reach the ultimate state of tensile bearing capacity,they all correspond to the tensile yield of longitudinal reinforcement in non-lap zone.The ultimate tensile bearing capacity of each type of wet joint is only related to the product of area and strength of reinforcement in non-lap zone,that is,the bearing capacity is equal to the tensile force of longitudinal steel bar in the non-lapped zone when yield.The successful application of L-shaped steel bar connection method in the widening project of Luoxi Bridge shows that the cracking load and bearing capacity of connection structure are equivalent to the wet joints of other steel bar connection.It has the advantages of simple construction technology and convenient construction,which is worthy of popularization and application in similar projects.
bridge engineeringL-shaped barfinite element analysiswet jointsuperimposed beamconstruction technologymechanical performance
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