| Corrugated Steel Web PC Composite Beam is a new bridge structure for the last century,began to emerge in the 1980 s, through the use of steel webs replace conventional concrete web, the weight of bridge has been reduced, and the force is more reasonable. It is now widely used in girder bridge, caber-stayed bridge and other types of long-span bridges structure. Its lightweight, durable features make the prospects of this type of bridge even brighter. The research results on the corrugated steel web is more mature and the direction of research has become even more variety.At present, the research aspects of Corrugated Steel Web PC Composite Box Girder such as bending, torsion, shear and stability analysis has been very rich, but the research of dynamic aspects is slightly less.By twisting vibration analysis and structural analysis methods, combined with the use of existing shear modulus and the equivalent torsional stiffness calculation method, derived the natural frequency formula of Corrugated Steel Web PC Composite Box Girder.By creating a model test beams, and establishing the simulation model of beams with corrugated steel webs using finite element software, we analyze the modal characteristics of the model. Through the measured frequency data and the mode of vibration, and the results deduced formulas calculated through comparison analysis, the distribution law of torsional vibration type is obtained, and the accuracy of the calculation formula can be verified.In order to research the impact of the diaphragm on the torsional dynamic characteristics,on the basis of finite element simulation model of by changing the number and the position of diaphragm, the most effective arrangement of the diaphragm is obtained, and the impact of the diaphragms on the torsional dynamic characteristics of simple supported box girder with corrugated steel webs.Based on Yanbai Yellow River Bridge in Lanzhou, using MIDAS software, finite element analysis of seismic response is finished. Through the equivalent replacement of corrugated steel webs, the seismic response of concrete box girder with equivalent results were compared. Comparative results show that continuous girder bridge with corrugated steel webs has a better seismic performance. |
