Analysis of Cracking Mechanism and Countermeasures for Large-Size Reinforced Concrete Girder Bridges with Shaped Slabs
The work aims to analyze the cracking mechanism of large-size reinforced concrete special-shaped plate girder bridge,improve the crack resistance of special-shaped plate girder bridge by changing the bearing constraint method,and reduce the maximum crack width of large-size reinforced concrete special-shaped plate.In the model analysis,self-weight,shrinkage and creep,and lane loads were applied to analyze the deformation,bearing reaction,structural stress,and tensile damage distribution of the special-shaped plate girder bridge under the above loads.At the same time,the calculation formula of the maximum crack width is introduced to analyze the cracking characteristics of the special-shaped plate.Under the above load,the deflection between the supports arranged obliquely by the special-shaped plate was large,and the support did not overload or disengage.In addition,the stress level of the bottom surface of the special-shaped plate is higher than that of the top surface;the distribution of concrete tensile damage is closely related to the arrangement of bearings.The crack resistance of the special-shaped plate girder bridge can be effectively optimized by reasonable adjustment of the bearing restraint mode,and the maximum crack width is reduced by 32.8％.
large-size shaped slabscracking mechanismbearing arrangementfinite element methodmaximum crack width
万方数据
维普
