Research On Properties And Design Methods For Steel-concrete Composite Open-web Plate

ABSTRACT:Steel-concrete composite open-web plate is composed by the lower two-way steel rib, the upper concrete slab and steel shear key which connects the upper and lower to work together. It has been of good mechanical properties, strong stiffness, overall excellent, light weight and superior economy. It is especially suitable for the industrial and civil building's floor with large span or under the large load. At present, the research of composite open-web plate mainly focused on the static analysis on the simply supported plate. A preliminary study had been done on its dynamic performance, and the shear connector forces performance had made a more in-depth study. However, the existing theoretical analysis is different from the experimental results, and the actual engineering design is conservative. The force parameter analysis for the structure has done less, so the actual volume of steel is too large, and the advantage of structure reflected no obvious. Elastic analysis method is clearly not applicable under ultimate load because of stiffness becoming lower after concrete cracking and the material nonlinearity. Therefore, it is necessary to do a further analysis on the mechanical behavior of structures by nonlinear analysis methods, conduct a detailed study on the structural parameters, make optimization design, and to summarize the analysis and design methods, in order to improve the design theory, and promote the extensive use of the structure. The major work and the main conclusions of this paper are as follows:1.Steel-concrete composite open-web plate finite element model had been established by using of APDL language based on the ANSYS finite element software, and the linear and nonlinear analysis had been completed. By comparison with existing experimental results, it verified the rationality and accuracy of the finite element model. It had obtained a preliminary analysis for the internal force distribution and deformation of the plate under the flexible working conditions, and distribution of the stress, strain and crack for the structural under ultimate load.2.By changing the geometric parameters of composite open-web plate, including plate span, shear section size, mesh size and concrete strength grade, it had analyzed the impact of various parameters on the mechanical properties of plate.3.To study the optimal cross-section for steel-concrete composite open-web plate. The authors established a finite element analysis model, optimization parameter model and optimization mathematics model of simply supported steel-concrete composite open-web plate. The optimization result indicates that this method is efficient in optimizing the section, so it could be applied extensively in the steel-concrete composite open-web plate section optimization design. The optimum of the steel-concrete composite open-web plate section was obtained after the optimization of different span plate. The impact of long-span ratio and design proposals of geometry size for the steel-concrete composite open-web plate had been discussed.4. It had discussed the analysis and design methods for the steel-concrete composite open-web plate. The elastic analysis methods base on the orthotropic plate theory, ultimate load analysis base on the partial destruction of hinge line, practical calculation methods base on the reinforced concrete vierendeel sandwich plate, and design points had been obtained for designers.