Analysis&Research on Mechanical Performance of Prefabricated Large Cantilever UHPC Hollow Cap Beam
The capping beam plays an important role in connecting the preceding and the following in the bridge structure.The capping beam of urban bridges mostly adopts the form of large cantilever structure,while the prefabricated large cantilever capping beam has large volume and weight,which puts forward very high requirements for transportation and hoisting.To reduce the self-weight of prefabricated large cantilever capping beam and promote the engineering application of prefabricated substructure,this paper takes the lightweight of prefabricated large cantilever capping beam as the research purpose,and carries out relevant mechanical properties analysis and Research on Π-shaped hollow capping beam,C80 solid capping beam and C80 inverted U-shaped capping beam using UHPC material.The results show that UHPC material has excellent mechanical properties.Although the wall thickness of the hollow section of UHPC-Π cap beam is thinner than that of the ordinary concrete inverted U-shaped cap beam,its bending and shear capacity can basically maintain the same level as that of the ordinary concrete solid cap beam and the ordinary concrete inverted U-shaped cap beam.The strength of UHPC material has little effect on the torsional bearing capacity of Π-shaped bent cap,while the thickness of roof has a significant effect.The torsional bearing capacity of Π-shaped bent cap can be improved by increasing the thickness of roof.
prefabricated bridgelarge cantilever hollow cap beamlightweightUHPC
NETL
NSTL
万方数据
