Study On The Static And Dynamic Characteristics Of Bridge With Corrugated Steel Webs

The PC bridge with corrugated steel webs originated in France, due to this new bridgecan completely solve the "web cracking" persistent ailment of concrete box girder bridge, andit has a very high bearing capacity, it appears in1980s in France, and it soon got applicationand popularization in Japan, Germany, South Korea and other countries. China has launched alarge number of scientific research on the new bridge and constructed dozens of bridges withcorrugated steel webs successfully. Till now, many countries have made systematic study onstatic performance of beam structure with corrugated steel webs including shear, bending,torsion, the stability of steel webs, while the force analysis of continuous beam structuretransformed from simple-supported is less, and the research on dynamic characteristics of thebridge with corrugated steel webs is still in the initial stage.On the basis of a built continuous bridge with corrugated steel webs transformed fromsimple-supported, this article uses the finite element method and makes an comparativeanalysis of the static and dynamic characteristics of bridges with corrugated steel webs andconcrete girder bridges, and the paper makes a study of the effect of diaphragm on bridgeswith corrugated steel webs and the seismic performance of this bridge. The research of thispaper shows the axial stiffness of corrugated steel webs is very low, and it does not resist axialforce and bending moment, then it can be thought the normal stress generated under thebending moment on the bridges with corrugated steel webs is mainly supported by the roofand bottom concrete plate. the roof and bottom concrete plate does not bear shear force whilethe steel webs bear all the shear force in the bridges with corrugated steel webs.It can be found from the comparison of dynamic characteristics of the two bridges, thetorsional vibration frequency of bridges with corrugated steel webs is lower than the concretegirder bridges, increasing span diaphragm can improve the natural torsional vibrationfrequency of structure, Partition on the corrugated steel web plate has a significant influenceon the natural vibration characteristics of bridges, while the number of midspan diaphragmplates has little effect on natural vibration characteristics of bridges with corrugated steelwebs.In the case of vertical seismic action, the deformation pattern between bridges withcorrugated steel webs and the concrete girder bridges is very similar, and it indicates bridgeswith corrugated steel webs also have a strong bending rigidity. But according to the responsespectral combination deformation results under horizontal seismic action, there exists anobvious differences in deformation pattern of bridges with corrugated steel webs and theconcrete girder bridges, and it shows restraint on the top plate and the bottom plate of corrugated steel webs is less than the constraint function of that on concrete girder bridges.Under the same action of seismic wave, time history response of bridges with corrugated steelwebs is much lower than the concrete girder bridges. The reason is that the longitudinalstiffness of bridges with corrugated steel webs is smaller, and when the bridges are under theaction of seismic energy, and in order to produce not too much internal force, the bridges needlarge deformation to resist the consumption. It can be found that seismic performance ofbridges with corrugated steel webs is more superior from the analysis of response spectrumand time history results.