Experimental Study On The Segment Model Of Steel-Concrete Composite Deck System Structure

With the development of economy, the traffic load is seen upsurging as well. Bridge, as the hub of the traffic engineering, its structural safety, material economic efficiency and social benefits are growing to be more prominent. As a new type of composite structure, the steel concrete composite deck system will embrace prosperous application prospects due to its light weight, economical material consumption and strong bearing capacity. Aided by computer software ansys, finite element segment model for steel concrete composite deck background projects is set up, parametric structural analysis method is employed to study the impact of the structural deflection and stress caused by steel truss and concrete bridge deck, and the optimal compound mode is ultimately achieved with structural deflection, economical efficiency and its material strength taken into account. According to similarity theory, a finite element model for monolithic steel truss concrete composite structure is created and the segment scale test mode is launched for stimulation. The focus of this paper are mainly as follows:First, it adopts parametric structural analysis method and reaches the result that height of steel truss can heavily effect the deflection of the structure and the stress of bridge deck and steel truss bottom chord, and that the thickness of concrete slab has little influence on overall structural stiffness in that the influence on structural deflection, the stress of bridge deck and steel truss bottom chord from varying thickness can be neglected. Secondly, with optimal compound mode, the segment scale test mode one to eight in ratio is launched in accord with stiffness similarity principle. Thirdly, under the help of finite element method, the analysis of structural deformation and stress under various working conditions such as two-thirds points symmetrical load, cross-concentrated load, and the most unfavorable equivalent vehicle load of intermediate nodes in steel truss bottom chord is conducted to test the segment scale model whose result, however, tested and verified the finite element analysis method in reverse.Additionally, the stimulation result of the most unfavorable equivalent vehicle load of intermediate nodes in steel truss bottom chord illustrates that under the condition of equivalent and concentrated load of all nodes, displacement of the node distant from the load as well as the truss stress will fade, while truss stress and displacement of nodes nearer to the load will increase. Also, it reveals that straight webs bear compressive stress, while diagonalweb members bear alternatively tensile and compressive stress except the two adjacent diagonal webs which bear compressive stress under all working conditions. Finally, the calculation formula for steel-concrete deck system composite structure is put forward.