| This paper summarizes the current situation of static analysis and parameter sensitivity analysis of prestressed concrete continuous beam bridges.On this basis,combined with Zhengzhou Longhai Road elevated project,taking the three-span prestressed concrete continuous box girder bridge as the research object.The finite element analysis method is used to study the static performance of the continuous beam during operation,the sensitivity of the load parameters and the sensitivity of the design parameters.In the static analysis,the influence of three-span prestressed concrete box girder bridge on the bearing seat force is summarized,and the internal force and stress changes under moving load,temperature effect and foundation settlement are analyzed.The normal use limit state of the project,the ultimate limit state of the load capacity and the stress under the permanent condition are checked.Selecting the three roles of system temperature,temperature gradient and foundation settlement among the many load parameters affecting the static performance of the continuous box girder bridge,and analyzing them separately.The variation law of different system temperature and temperature gradient effects on continuous box girder is studied by changing the range of temperature variation;By changing the size of the settlement value,the variation law of the influence of foundation settlement on the continuous box girder is analyzed.Selecting the side span ratio for sensitivity analysis in design parameters affecting the static performance of continuous box girder bridges.Keeping the total span constant,using finite element software to establish a finite element model with different side span ratios based on the initial model.The variation law of the influence of the side span ratio on the continuous beam deflection,the bearing reaction force and the internal force is analyzed to conclude that the value of the side span ratio is reasonable in the range of 0.6 ~ 0.8. |
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