Finite Element Analysis And Construction Monitoring For Tongnan Bridge

The structural style of Tongnan bridge is novel,In order to appraise its performance correctly under each kind of work condition,this paper has carried on the exhaustive finite element analysis to tongnan bridge.Firstly,the traditional computation method of steel bridge is summarized,then model all structural components of this type bridge in detail under a unifiled system which is based on entire bridge simulation.This entire bridge model can get results with sufficient accuracy,which can overcome some shortcomings in traditional simplified methods based on pin-jointed truss members and beam elements,such as inaccurate description of connection among the members of truss and between the members and deck system,and inaccurate hypothesis boundary conditions,and overlooking effects on cross width of members of truss.Secondly,a member system modal has been established. Using this modal the buckling analysis and nonlinear buckling analysis is performed to gain the buckling loads.Thirdly, a nonlinear finite element analysis was conducted for the static behavior of hollow structural section joints using a typical joint analysis.Both the upward and downward phase of the curve of load and displacement are traced,and the ultimate capacity,joint's deformation,joint's failure modes,etc.The results show that all of the three joints meet the demand of safe.Finally,the last point studied in this paper is the construction monitoring and capacity experiment of this bridge.With the advanced measure equipment,the inner force of key components during and after construction can be put on track and under control.The stress variation regularities of each component are achieved.The results of measurement are compared with the theoretical ones.Therefore more practical suggestion of improvement can be made for both design and construction.