The Node Analysis Of Mechanical Properties For80M Steel—concrete Composite Truss Bridge

The Xi’an to Pingliang new railway projects in the80m steel-concrete composite structure of the truss bridge is a new form of steel reinforced concrete bridge structures abroad for that type of bridge is still in the exploratory stage, althoughbuilt a real bridge, but the span is small, China is also the first such structure is applied to actual projects. Xi’an to Pingliang new railway projects in the80m steel-concrete composite structure of the truss bridge is the longest span bridge in the world the same type of bridge structure.Steel-concrete composite truss bridge is steel and concrete composite structures, beam bridge, steel belly bar with concrete links node is the focus in the design and construction. Given the complexity of the mechanical behavior of the node area, the true carrying capacity of the node parts of the stress distribution law, and explore the node region is the component way of linking the reliability evaluation node to reveal the structure of the type of mechanical behavior of great significanceThe paper engineering example, the establishment of a full-bridge finite element model and node parts of the three-dimensional fine finite element analysis model to study the stress field and its distribution law of the nodes under the most unfavorable load conditions, the analysis results to determine the texture and structure design measures. The main content of their research include the following aspects:(1) Introduced the steel-concrete composite structure of the historical development, characteristics and common type, and summary of domestic and foreign steel-concrete composite structures research and application of.(2) To Xi’an to Pingliang new railway engineering background, using the finite element theory means to determine a reasonable structural parameters. Finite element analysis model of the space to build real bridges, to study the static properties of the80m simply supported steel-concrete composite truss bridge.(3) Described the partial analysis of the steel-concrete composite connections and significance analysis of steel-concrete composite node structure characteristics of study node three-dimensional solid finite element simulation method, the establishment of the local finite element model of steel-concrete composite nodes, nodesThe stress analysis of the results.(4) With an engineering example of steel-concrete composite bridge analysis to explore the analysis of the distribution law of the node stress under typical loading conditions, analysis of the mechanical properties of the study node. (5) Through research, to reveal the true carrying capacity of steel-concrete composite joints to determine a reasonable node structure of the steel-concrete composite structural, design measures limit state analysis of the carrying capacity of steel-concrete composite joints.