Analysis Of Static Characteristics Of Simply Supported Continuous Skew Beam Bridge

When the road-building process is restricted by obstacles or rivers,it is often necessary to build inclined Bridges to better adapt to the terrain.Since the 1980 s,with the development of high-grade highways and three-dimensional urban transportation in China,inclined Bridges have been applied to engineering practice more and more in order to meet the requirements of driving safety,comfort and beautiful lines.According to incomplete statistics,the number of inclined and curved Bridges on the highway can reach more than 45% of the total number of Bridges on the whole line.The appearance of inclined bridge can not only make the linear structure of the whole bridge more beautiful and smooth,but also can shorten the length of the bridge,save manpower and material resources,in the economic aspect also has certain promotion effect.But the stress of the skew girder bridge and structural characteristics have a great difference compared with the orthogonal girder bridge,under the action of oblique support,makes the bending and torsion coupling effect and further lead to the structure analysis is complicated,and in many key issues,the current related research also is not very thorough,such as oblique Angle,bearing stiffness on the internal forces of the medium and small span continuous T girder bridge,the reaction influence factors and the degree of skew girder bridge the arch effect and so on are still no definite conclusion.Based on the three-span simply supported continuous skew t-beam bridge,the static characteristics of skew t-beam bridge are studied by the method of load test and finite element numerical analysis.The main research contents are as follows:(1)Field test is carried out on the actual engineering bridge to collect the data of midspan deflection and strain of the bridge under different load conditions;the finite element model is established by using the beam grid method,and the accuracy of the beam element model is verified by comparing the experimental data with the data calculated by the model,so as to pave the way for subsequent research.The load transfer law of skew bridge model under the action of load is obtained,and the method of calculating the transverse load distribution coefficient and the shear force at the fulcrum section of continuous skew beam bridge is further studied.(2)Analysis of the influence of vertical stiffness of bearing on internal force of skew beam bridgeThrough the derivation of the calculation methods of the vertical,horizontal and rotational stiffness of the plate rubber bearing,the influence of the vertical stiffness of the bearing on the internal force of the continuous inclined beam bridge under different slopes is studied.This paper analyzes the influence of the plate rubber bearing on the maximum bending moment and the pivot shear force in the continuous skew beam bridge under the second stage load,and analyzes the error of the rigid bearing modeling method.The error analysis of the modeling method with rigid support is carried out.(3)research on construction technology of prestressed inclined beam bridgeBased on the calculation model of the skew box girder bridge,the reverse camber of the skew box girder bridge in the stage of prestressing is studied.The internal force and displacement of the web at the end of the beam caused by the prestressing force of the skew box girder bridge with different slopes are analyzed,and the influence of the prestressing force on the web during the construction stage of the skew box girder bridge is obtained.The relevant suggestions are put forward for the construction process of the simple to continuous skew girder bridge.