Impact Studies Of Stiffness Degradation Of The Steel Bar Truss Concrete Slab To The Whole Structure Stiffness

Steel bar truss concrete slab is a new form of composite floor slab。It is widely used in industrial a nd civil b uildings be cause it has t he ob vious advantages t hen t he ordinary slab. Now, the study of steel bar truss concrete slab focuses on stress modes and the connection between the steel beam and floor. Now, people are paying more and more attention to steel bar truss concrete slab stiffness. The Purpose of this paper is t o s tudy the floor s lab s tiffness de gradation in the e arthquake forces o f s teel structure buildings with steel bar truss concrete slab .Cellular A utomata M achine model is a k ind of d iscrete s pace-time d ynamic system, it is very fit for the simulation research of composite dynamic space-time system. Cellular Automata Machine theory has its obvious advantage on describe the concrete composite floor slab stiffness degradation. This paper firstly analysis group structures by large finite element analysis software Ansys. This paper analysis the influence of the slab to structure stiffness,and the influence law of the slab in a different plan layout form the influence law of the floor. Then, through improving the original dynamic simulation test system this paper simulate the Steel bar truss concrete slab destruction rules in earthquake wave。Research shows that concrete steel bar truss concrete slab can enhance lateral stiffness of concrete frame structure. In different plan layout form,the lateral stiffness of the structure first smaller, and then get big along with the increase of the number of structure layer . In the dual axle symmetrical layout rules, It is very obvious that steel bar truss concrete slab can increase the lateral stiffness. It is more obvious that the lateral stiffness small side floor can increase the lateral stiffness. Under the effects of earthquake, steel structure b uildings firstly happens tensile failure o f concrete s teel bar truss concrete slab, and then the beam failure. The failure of beam and slab of the structure will increase the lateral displacement of the structure and reduce the integral structure stiffness.The dynamic simulation test system created by Cellular Automata Machine theory not only have the practical application value in solving the stiffness of reinforced concrete slab truss of a steel structure project in Tianjin but rich the research methods of steel truss concrete composite floor slab stiffness degradation of the earthquake. It provides a theoretical support for the application and popularity of the steel truss concrete floor.