Based On Statistical Analysis Of Curved Box Girder Bridges Mechanical Performance

In recent years, with rapid development of the economic construction and the communication of our country, the demand for curved bridge increases greatly . Because of Iandform limiting or the demand for overpass, the large-scale cloverleaf junction and urban trestle adopt the curved bridge becoming the curve on the level extensively. In due to exist of curvature , curved bridge also comes into being the torsion while producing bending moment even if it is in function of vertical load . Therefore , the curved bridge often adopts the box section which has not only strong sectional globality , but also great rigidity of resisting spraining and good distributed performance of horizontal load . However , section of box-girder will shape warping and distortion under function of torsion, which will make mechanics analysis to curved bridge very complicated. So developing the calculation theory of the curved box-girder bridge is one of important research subjects for expert and scholar of various countries .Research object of this paper is the curved box-girder bridge of two-step, three-step in succession . We set up model using "analysing software systematic 3D-BSA of oblique curved slope and special-shaped bridge space structure" as the frame calculating and analysing tools which is based on the theory of girder-case system , then carry on structure analysis . This paper also propose the proper suggestion for the practical design of the curved box-girder bridge and establishment of national specification or draw lessons, using Excell 2000 as data processing tool and setting up loaded property of the curved box-girder bridge and experience formula between parameters with method of statistical analysis.The main research contents include:1. Having analysed synthetically all kinds of calculating theory about curved bridge, set up corresponding structure analysis models using "analysing software systematic 3D-BSA of oblique curved slope and special-shaped bridge space structure" which is based on the theory of girder-case system .2. Having construing loaded property of internal force of utmost state of limited section of two-step, three-step curved box-girder bridge, unit displacement during the stage of construction and supporting reactions under the influence of eccentric support, receiving relevant curves and the experience formula , and carried on statistical analysisto the experience formula.3. Considering the influence of the curvature on internal force of utmost state of limited section of two-step curved box-girder bridge, unit displacement during the stage of construction and supporting reactions, it has drawn up the corresponding curve and set down formula chart.4. Based on the mechanics and statistical analysis of two-step > three-step curved box-girder bridge, the paper drew some universality conclusions and got out some mechanics laws about the curved bridge.