Long-span Composite Floor RHS Truss Optimization Analysis Based On The Cross Section Under The Optimal Combination Coefficient

Steel and concrete composite structure due to its“light large-span, rapid construction”,the characteristics of the large span space structure has wide application prospect. Especiallyin recent years, with the development of society and economy, people demand for large-spanspace combination structure, increase of domestic and foreign scholars on the research.However, compared with the traditional structure pattern of large-span space, for more floorhas superior mechanical properties of composite RHS truss structure at this stage of the studyalso is less. Therefore, this article USES the method of combining the numerical simulationand theoretical analysis of the ultimate bearing capacity and ductility performance of thecomposite RHS truss analysis research is realistic.The existing literature, this paper combined RHS truss in elastic stage theory ofcalculating stiffness and ductility, ductility and study presents a composite RHS truss ofmetrics. Composite RHS truss model is established using the ABAQUS finite elementsoftware, using nonlinear finite element, the analysis of the concrete slab thickness, strengthgrade, the size of the bottom chord section diameter, depth-span ratio and wide high floorthan in the form of composite RHS truss structure failure modes, ultimate bearing capacityand ductility performance, put forward the concept of cross section, the optimal combinationcoefficient of gamma. Research results show that the plate thickness, strength grade ofconcrete and the bottom chord diameter section size on the bearing capacity of the structureeffect depends on whether the main factors for the control of bearing capacity, Depth-spanratio on the bearing capacity is more noticeable, depth-span ratio is to improve the bearingcapacity of the effective methods, Aspect ratio changed from0.67to1.0, the first increaseafter decreases the bearing capacity performance trend, suggestion of the structure of theaspect ratio of0.8values; When the compression of concrete and the bottom chord of steeltruss tension damage occurs almost at the same time, both relative maximum displacementductility coefficient of RHS truss, this paper puts forward the concept of cross section, theoptimal combination coefficient of gamma, gamma=1.4300in the commonly used severalgroups of depth-span ratio and aspect ratio can make composite RHS truss showed good bearing capacity and ductility, can be used in practical engineering design. Bent by thepresence of two different forms of composite RHS truss floor has carried on the contrastanalysis, obtained with the combination of upper chord RHS truss on the economic andpractical than floor structure without the upper chord combination.