Analysis on Mechanical Performance of Long-span Composite Girder Bridge under Different Prefabricated Methods
In order to clarify the mechanical performances of integral prefabricated long-span π-type steel and concrete composite girder and separated prefabricated girder,combined with an actual project,the shell-entity finite element method is used to calculate the mechanical performances of two types of large-span composite girders.The results of the calculations show that the stresses in the integrated prefabricated composite girders are much less than those in the separated prefabricated composite girders during the bridge finishing stage.The maximum compressive stresses at the upper flange of the steel girders of two composite girder are 84.3 MPa and 229.0 MPa respectively,and the tensile stresses at the lower flange are 167.3 MPa and 196.0 MPa respectively.The stresses at the upper flange of the concrete at the middle support position of the two composite girders are almost the same.At 10 years of completion,the maximum tension stress increment at the upper flange of steel girder of the two composite girder are 88.1 MPa and-4.0 MPa respectively.The maximum tension stress of concrete of the integrated prefabricated composite girder is 0.67 times of the separated prefabricated composite girder.In addition,from the aspects of construction efficiency and construction quality,the integrated prefabrication method has obvious advantages in the construction of long-span composite girder bridges in mountainous areas.
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