Friction Effect of Girder of Horizontal Swing Continuous Beam Bridge in Cast-in-Site Construction
The continuous beam bridge constructed with the technology of horizontal swing usually builds its' spin beam section in a way of scaffold in-site.When the spin beam section is too long, a great frictional force and tangential cohesive force will occur in the contact surface between the casting beam body and shuttering, which will hinder the free deformation of beam, as a result, the stress losses of pre-stressed box beam will be increased.Using finite element analysis software, the frictional coefficients between the casting beam and the holder of bottom shuttering are analyzed, and the girder element stress of the biggest cantilever state is calculated when the pre-stressed reinforced steel is stretched.The result indicates that the influence of the friction effect and tangential cohesive effect on the pre-stress of beam body can' t be ignored in some cases.
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