Dynamic analysis of new corrugated steel web composite box girder bridge
The dynamic characteristics and seismic performance analysis were conducted on a new type of corrugated steel web composite box girder bridge structure.Taking the mid-span box girder section of the Juancheng Yellow River bridge as an example,a multi-scale finite element model of the composite box girder bridge was established and compared with the measured values,and the effectiveness of the multi-scale model was verified.Based on this,the cross-section parameters of the new type of corrugated steel web composite box girder were designed,and the influence of parameter changes on the dynamic characteristics of the box girder was studied using a multi-scale modeling method.The structural response of the structure under muti-directional seismic action was analyzed using the seismic response spectrum method.The results show that the number and thickness of box girder diaphragms are sensitive parameters of structural dynamic characteristics,which have a significant impact on the torsional stiffness of the structure.Increasing the thickness of the corrugated steel web can effectively improve the structural stiffness,and the impact of stiffness increase on frequency is greater than that of mass increase.It is recommended to set the web thickness to 20-30 mm.Groove steel webs can effectively improve the bending stiffness of the cross-section,especially have a significant impact on the vertical bending mode of the structure.The transverse seismic action has the greatest impact on the stress of the concrete top plate and diaphragm,the longitudinal seismic force has the greatest impact on the stress of the corrugated steel web,and the vertical seismic force has a greater impact on the stress of the concrete bottom plate and groove steel plate.
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