The Research On Lateral Load Distribution Of Simply Supported T Beam Bridge

In the road surface alignment design,the optimal bridge direction should be consistent with the shape of the road line connected to it,and should be perpendicular to the crossed obstacles,so as to achieve the goal of minimizing the bridge span,but this is often difficult to achieve at the same time.Therefore,more and more inclined bridges came into being.Setting skew bridge can not only shorten bridge length,save material and cost,decrease engineering quantity and increase aesthetic features of bridge and route,but also avoid influences of orthorhombic structure on flood discharge,navigation and traffic.Consequently,the skew bridges,especially small and medium span oblique beam bridge,are widely used among high-grade highway,urban road,urban interchange hub and hydraulic engineering.At present,researches on skew girder bridge in China haven't reached to a completely practical situation yet,not giving enough guidance on practical engineering.Basing on these considerations,this essay tries to research on the load lateral distribution of simple diagonal T-beam bridge.The principal researches and related results of this essay are as follows:(1)This chapter mainly sketches out the research background of the essay,simply introduces the concept and categories of skew bridge as well as sums up current research situations at home and abroad on load lateral distribution of skew girder bridge,and finally states the principal research of the essay.(2)This chapter gives a comprehensive review of related concepts and basic theories on load lateral distribution of girder bridge,focusing on three popular calculation methods on load lateral distribution of skew girder bridge.(3)This chapter expounds the fundamental principles of grillage method,criteria of categorizing grid beam and cross-section properties of grillage components.Taking a simple-supported five-beam inclined T-beam bridge as an example,Midas Civil was used to establish a beam grid numerical model for analysis,and the lateral load distribution coefficient of the mid-span and fulcrum was solved,and the results were compared with the results obtained by the conventional traditional simplified methods.The findings are more consistent,demonstrating that the Liangge numerical model's rationality and accuracy can be guaranteed.In the calculation of lateral load distribution coefficient of cross-section,the calculation result of G-M correction method is too small,the calculation result of rigid cross-beam method is larger,and the calculated results of generalized beam method are in good agreement with the numerical model.In the calculation of lateral load distribution factors of the fulcrum section cross sections,the results of the G-M correction method and the generalized beam grid method are located near the numerical model calculation results,but the results of the rigid beam law relative to the other three calculation methods are obviously larger.(4)Basing on numerical model of grid beam constructed in last chapter,this chapter tries to set up a series of finite element models by altering different analysis parameters(skew angel,span,number of girder and middle cross beam),and further analyzing the load lateral distribution rule of simple diagonal T-beam bridge.