Research On The Shear Stud And Geometric Dimensions Error Controlling Area For I-Shaped Steel-Concrete Composite Beam Bridge

Steel-concrete composite structure has been widely applied to bridges by virtue of its light weight,quick construction,and modern appearance.Nevertheless,the inspection and assessment of its quality,conducted by the employer,construction units,supervision units,and supervised units,mainly relies on the corresponding standards.After collecting and arranging these standards,we found that there exists some conflicts among the allowable deviation for construction error,and some ambiguous relevant regulations.Besides,whether the relevant allowable deviation for construction error is appropriate for the steel-concrete composite bridge still needs further investigation.Hence,by means of the finite element simulation tool,we made efforts to investigate the tilted studs,cavernous concrete,and the allowable deviation for construction error of the sectional dimension of composite beam that might exist in the structure.Combining with our research subject,the main work in this paper were elaborated as described below.(1)Research background of the inspection method and assessment standards for the quality of the steel-concrete composite bridge,and the current domestic and overseas researches on the mechanical behavior and construction error controlling area for it were stated in detail.The existing problem to be solved and the research contents were then put forward in this paper.(2)Bridge diseases of steel-concrete composite and the causes for them were analyzed,trying to figure out the main influence factors of the construction process on the bridge structure.Besides,the construction error indicators and the controlling area for steel-concrete composite bridge were filtrated,aiming to provide basis for standards setting.(3)By using of ABAQUS software,elaborate simulation on the steel-concrete composite bridge was implemented to analyze the overall mechanical behavior and the effects of different load on studs,and to obtain the mechanics regularity of the studs used in medium and small span bridges.(4)By using of ABAQUS software,the bearing capacity of uplift and shear of studs were further analyzed,and compared with the parameters reported in the literature to testify the reliability of the simulation.Analogue pull-out simulation was performed to analyzed the effects of concrete strength and stud length on the studs' bearing capacity of uplift.Analogue pull-out and push-out simulations were used to analyze the effects of tilted studs and cavernous concrete on the studs' bearing capacity of uplift and shear.(5)Combining with construct project,theoretical formulas were employed to analyze the sensibility of different control indices(section stress,deflection)to the dimension error of the sectional dimension of the composite beam bridge,Monte-Carlo method were used to calculate the effect of construction error on structural reliability,and to analyze the impact of the construction error controlling area of sectional dimension on the limit state of the structure,and finally made a preliminary proposal for appropriate construction error controlling area.