Abstract:The stress of curved continuous beam bridge is more complex. The plane bending of the main girder makes the stress supporting point of the lower pier not in a same straight line so as to cause larger torque and torsional deformation and to constitute its unique stress characteristics. How to control the torque of the main girder structure and restrict the torsional deformation are of great importance for the safety of bridge structure. At the present, the flange width is decreased and the box chamber is increased normally. Two measures of increasing the beam height and the web thickness are taken to improve the torsional properties of the main girder section. Taking an engineering case as the background, through changing the supporting layout of curved box beam bridge, the distribution of the structural torque of the main girder can be more conveniently and effectively changed to reach the purpose of torque balance.
