Stress Analysis Of Preflexed Simply Supported Steel-concrete Composite Beams

With the continuous improvement of road grade and the expansion of construction scale,Bridges show the development trend of incre asing span,enriching bridge types and lightening structure.Meanwhile,more and more attention is paid to the mechanical performance and comprehensive benefits of bridge construction.Under this background and requirements,the traditional steel and concr ete composite girder bridge,although in general can also meet the requirements of design,construction and use,but the study is found that under the same conditions,the traditional steel concrete composite beams after applied preflexed technology,the advantages of concrete compressive stree and the joint shear stress of preflexed steel-concrete composite beams are more evident.Based on the theory of traditional simply supported steel-concrete composite beams,combined with the calculation method of prefl exed composite beams,the concept of preflexed steel-concrete composite beams is proposed.The theoretical comparison between the two and the comparison of the finite element calculation results show that the section stress and joint shear stress of the pre flexed steel-mixed composite beams are smaller than the core argument of the traditional steel-mixed composite beams.By comparing the theoretical calculation results of the preflexed steel-concrete composite beams with the calculation results of the finit e element model,the same fonnula also verifies the validity of the validity of theoretical method for preflexed steel-concrete composite beams.