Structure System FEM Analysis And Construction Control Of Tie Arch Bridge

This paper is concentrated on the double R.C X-arch bridge's structural system and construction control theory. Its inner arch rib inclines outer and the outer arch rib inclines inner. The combination arch ribs, tie-bars, and cross beams make up of space structure system. Its spacial static force,dynamical analysis and stabilization are very important in bridge compute and analysis. The double R.C X-arch bridge's design idea is different form other tie-bar arch bridge because its inner force is complex and spacial effect is obvious. It's necessary to sum up a suit of design methods according to its characteristic. On the background of the scientific research items , a complete analysis theory and calculation method which include optimal of the suspender's tensile force,the static force,the dynamical characteristic,the stabilization and construction control are built. The main subjects are summarized as follow:1. Set up the tie arch bridge's mechanics model and the optimize compute method.In traditional arch bridge compute method, the multi-system suppose, multi-plane suppose, up-down structure suppose, bore and rigidity connection suppose are used to translate the actual bridge structure into mechanics model. These supposes are accurate to ordinary arch bridge analysis, but not work with the complicated tie arch bridge. This paper researchs the bridge's mechanics performance according to structure and mechanics characteristic and sets up integer fine FEM mechanics model which consists of arch rib, suspender, bridge board. The suspender's tensile force is deduced by the optimize method based on the aim that keep the bridge board's bend moment minimum and compared with orther optimize methods. The suspender's length and corresponding geometry stiffness matrix [ K cg]are computed. The bridge's statical and dynamical force are analysised by induct the geometry stiffness matrix which form a complete and innovate mechanics analysis theory and method of the tie arch bridge. (corresponding paper numbers are [3], [4] in appose table)2. Deduce the dynamical characteristic and stabilization eigenvalue FEM analysis methods considering the suspender's orginal geometry stiffness matrix.The collapse of tie arch bridge is relate to the suspender's health. In tradition design, the suspender's tensile force is computed by the simple-support beam model( [ K ]= [K₀], [ K₀] is the bridge's stiffness matrix ) which ignore the effect of...