Research On Static Properties Of Cable-Stayed Bridge With PC Curved Box Girder

Curved box girder cable-stayed bridge is a cable-stayed bridge located in the direction of the curve. It has apparent curved bridges characteristics and a multiple hyperstatic system of cable-supporting, thus the force is extremely complex with a highly spatial characteristic. This kind of bridge has become competitive in urban road and rail traffic because of its strong adaptabilityof line. Based on PC box girder curved cable-stayed bridge between Redhill station and Shang Tang North of Shenzhen Metro Line 6, the mechanical performances of the bridge was researched by using FEA software Midas/Civil 2012.The major contents are summarized as follows:1. Determine cable force method of curve dcable-stayed bridge, compare rigid supporting continuous beam method, bending energy minimization method and unknown load factor method, propose a reasonable method of the cable force;2. By calculating and analizing the whole bridge, internal force and deformation of the main beams and bridge tower which were under unfavorable conditions was obtained. The support reaction and cable force were calculated, and the strength and stiffness were verified with current rules. Then the foece features were summarized according to the results above;3. From analysis of mechanical characteristics of curve cable-stayed bridge, five key design parameters were selected:the main beam curve radius, the main beam bending stiffness, torsional stiffness,lateral offset distance and bridge tower lateral inclination angle.Change this five design parameters respectively to study the force law of the main beam and bridge tower.Obtain the force law of such bridge type through comparative analysis.In this thesis, PC box girder curved cable-stayed static performances were comprehensively analyzed the key design parameters were studied,especially the two parameters on the bridge towers lateral inclination angle and the main beam lateral offset distance, which is proposed by practical engineering problems encountered, with some innovation. Research work in this paper can provide a reference for bridges design in the future.