The Analysis Of Mechanical Properties Of Double Amplitude Space Truss Composite Beam Under Deflected Load

The steel truss and concrete composite beam is a new type of composite structure in which the space pipe truss and concrete slab co-act together. Making the most of the material properties of steel and concrete, it has very wide application prospect in the field of bridge and high-rise building, with many advantages such as big stiffness, small cross-section, high carrying capacity, superior aseismic and dynamic performance and convenient construction.Although steel truss and concrete composite beam has the above advantages, but at present research on it is not deep enough, especially the research results on the double amplitude space truss composite beam is relatively little. And in the specification for domestic and foreign relevant composite structures, there is also no corresponding specific calculation formula and design theory. As a result, the study on the double amplitude space truss composite beam is very necessary, and the analysis of double amplitude space truss composite beam under deflected load is of very important theoretical significance and application value. The main work in this paper is as follows:(1) The research of steel and concrete composite structures home and abroad is on the basis of the related content, read and refer to a large number of related literature material about the steel and concrete composite beams, to design out this topic the research structure of steel and mixed double amplitude space truss composite beams.(2) Use the ABAQUS finite element analysis software for modeling analysis of space truss composite beams. Singles in the double amplitude and symmetrical load and symmetrical load under two loading conditions corresponding analysis and calculation. Extraction of double finite element analysis model of space truss composite beams in the process of load displacement deformation and stress distribution on the cloud, as well as in space truss, the stress around the bottom chord, the CHS center size. And analysis of its mechanical properties accordingly.(3) Through the finite element analysis software was carried out on the double amplitude space truss composite beams of double eccentric symmetric singles loading and eccentric loading simulation analysis under different working conditions, such as extracting the double amplitude space truss composite beams in the process of load displacement deformation and stress distribution on the cloud, as well as in space truss, the stress around the bottom chord, each diagonal middle size, the mechanical properties of the composite beams under partial load for the corresponding analysis.(4) Double width space truss composite beam in a symmetrical load, partial load and external load combinations within the partial beam bearing capacity and stress chord more detailed and in-depth comparison of data to quantify, and thus the effect of a combination of partial load beam accordingly.(5) Double amplitude space truss composite beams section on the elastic analysis. Wing, spatial pipe truss of concrete and concrete placing in the transformed section of composite beams, and does not consider the effect of composite beams is deduced and the corresponding formulae for calculation of section stress; On the double amplitude space truss composite beams section plastic analysis. Composite beams under the full shear connection state of the flexural bearing capacity formula is derived. Unlike pure steel beam, steel plastic bending bearing capacity of composite beams significantly higher than that of elastic bearing capacity.