Small And Medium-span Simply Supported Beam On The Long-term Camber Research And Design Proposals

The use of simply-supported girder bridge as the most common type should arouse our attention.In this paper, analyzed the issue of a brief review about the history and current situation of domestic and international vehicle-bridge coupled vibration and driving comfort evaluation, countered phenomenon of pre-stressed simply-supported girder bridge used to excessive upward and the phenomenon of vehicle-bridge vibration after simply-supported girder bridge has apparent arch; Simplified the complexity of the vehicle-bridge vibration to make appropriate model for the automotive vibration, on the base of the vibration of vehicular bridge, road comfort, as well as evaluation of the finite element method and numerical calculus knowledge, soluted the largest allowed camber at different span to consider a number of cross-road comfort question simply-supported bridge in the process of using.A novel automatically step-up method (ASUM) to analyze the relationship between long-term mid-span section camber and the diffirence of superior-inferior border stress is presented. Made at pre-stressed concrete bridge design should be to increase the margin for the upper and lower limit value of stress fate requirements.Somulated the camber of the Ministry of Road and Bridge general map (10,13,16,20 m simply supported hollow plate girder series) after 10 years in the use with solid finite element software. The results showed that 10,13,16m simply supported hollow plate girder beyond obviously comfort to allow the camber on the value and 20m simply supported hollow plate girder beyond slightly too.Simply-supported beam bridge in particular the small span simply supported beam bridge the use of the bridge to allow the calculation of the value of the allowed camber to seek a more reasonable method to control the design and construction, which has strong engineering practice guide.