Study on the Stress and Deformation Law of Full Space Support Method in the Cast-in-Situ Construction of Four-Lane Bridge
Based on the construction method of cast-in-situ box girder of full space support and combined with finite element model,the force and deformation law of full space support method in the construction of four-lane bridge is studied.The beam body bracket adopts WDJ type bowl buckle type multi-functional scaffolding,and after locally encrypting the full space support,the box girder cast-in-place bracket model is formed,and the monitoring parameter identification is accurately matched and merged with the beam segment to shorten the installation period.The deformation monitoring data of the bracket shows that the value of longitudinal deformation at the front end of the main beam is 34.6 mm,the value of the deformation at the front end of the bracket is 29.2 mm,and the relative deformation between the main beam and the bracket is about 5.4 mm.The reason is that there is a relative slippage between the main beam and the support in the prestressed tension stage.The friction coefficient at rows 1 and2 of the front end of the bracket is0.215-0.242,which is close to the minimum value generated by multi-layer contact between the bracket and the main beam.The deformation of the main beam will cause the force redistribution of the bracket,and there will be a multi-layer friction effect between the main beam and the support system under the main beam.
full space supportcast-in-situ constructionforce analysislaw of deformationfinite element modelfield moni-toring
NETL
NSTL
万方数据
