关键词: 桥梁工程, 组合箱梁, 空间有限元, 波形钢腹板, 弯扭作用, 屈曲

Abstract:

A spatial finite element model of prestressed-concrete composite box-girder bridge With corrugated steel web is established. The model is then used to analyze the effects of dimension parameters of the steel web on the critical buckling load coefficient and buckling mode of the web under the action of bending-torsion coupling action. The results indicate that the buckling of corrugated steel web under the action of mid-span eccentric loading always happens on the loading side, that the increment of anti-buckling capability of the steel web for the box-girders with different height-span ratios basically keeps unchanged when the corrugation angle of steel web is less than 20°, but increases with the corrugation angle when the angle is more than 20° and when the height-span ratio decreases, that the anti-buckling capability of the steel web with different thickness increases with the corrugation angle, the increment increasing with the angle when the angle is more than 20° and when the web thickness increases, that the increments of anti-buckling and anti-torsion abilities are basically consistent for the box-girders with different heightspan ratios at a certain corrugation angle and a increasing thickness, and that the anti-torsion capability of box-girder significantly decreases with the height-span ratio when the corrugation angle is less than 20° but linearly increases with the ratio when the angle is more than 20°..

Key words: bridge engineering, composite box-girder, spatial finite element, corrugated steel web, bending-torsion action, buckling