Study On Optimal Design Of Steel Bar Truss Slab

As the new third generation of buildings, steel structure residences, which have beengradually developed in China, have short construction period, high space utilization andperfect earthquake-resistant capacity. This new type of residence is an excellent choicein housing industrialization development. The floor system is one of the most importantpart of the steel structure residence. Steel truss composite slabs is a new composite slabswith a lot of advantages, such as construction speed and superior force structureperformance. At construction stage, the steel bar trusses in the components will provideenough rigidity to support a large unbraced length without templates, which make thecomposite slab fit for the requirement of construction speed in steel structure residences.The steel bar trusses, steel plate at the bottem and concrete will form a structural systemto afford service loads together at using stage.On the base of experimental research about bending performance of the floor, thispaper make a study on the optimal design of steel bar truss slab, and meet therequirements during construction and design process. The optimization algorithm is alsointroduced and the mathematical model about the steel bar truss slab is builded in thispaper. Through the experimental research on the slab,a practical basis is thereforeprovided for the accuracy of the optimized results.In order to make the optimizeprocesses and results have a reliable convergence to the global optimum, the zero-orderand the first-order methods are integrally used. In this Optimization model, we regardthe thickness of the slabs, the spacing of the Steel trusses and the diameter of the bars asthe design variables, the strength and deformation as the conditions, the minimum costof the mathematical model as the objective function at using stage,and the minimumconsumption of steel as the objective function at construction stage.The relations between iterative times and the design variables, the state variables andthe objective function are presented. And as the conclusion of this paper, we haveobtained,compared and analysed the optimized design results.We find that the slabswhich have been optimizedly designed will have a more reasonable force system, bemore convenient to construct and consume less material. The results of the checkedcalculation of the optimizedly designed slabs show that they are comply with thestructure design principles and the indicators of deformation and stress are better whencompared with the old design scheme. Finally, this paper analyses the influence of materials prices, strength of materials, board-load, board-span and other factors on thecost and optimized results of the steel bar truss slab. We conclude that theboard-load and the board-span are the key factors in determining the best thickness. Theoptimal design forms created according to the optimization results by us have practicalvalue for design.In the end of this paper,we have obtained the increased trend of themaximum span of the templates of the steel bar truss in considering the role of thebottom plate at construction stage. On this basis,we improve the optimal design formsof the templates.