Research On The Design Of The Frame Structure Of The Frame Structure With The Thickness Of The Plate And The Beam Column Line Stiffness Ratio

The continuous collapse of building structures under accidental loads is also increasing with the increasing of these external factors, such as natural disasters, terrorist attacks and accidents,including the British Point Ronan apartment due to the collapse of the explosion caused by the Wenchuan earthquake in the building structure of the continuous collapse of events and so on. Because structural progressive collapse occurs once, causing serious casualties and property losses, so these progressive collapses caused the wide attention of scholars at home and abroad on the building structure progressive collapse of. As early as in the sixty’s of last century, foreign scholars began to study the anti progressive collapse of the building structure because of the occurrence of the collapse time of the Point Ronan apartment. In the specification and system design method is proposed, the structure of the progressive collapse analysis methods, so now, great achievements have been made. Although domestic scholars for the building structure to resist progressive collapse performance research started relatively late, research in this area has already achieved great progress and standardization of our country is also given on the progressive collapse resistance design principles, but on the structural anti continuous collapse performance research also has the very big space and need to continue to explore. This paper mainly aimed at the beam column line stiffness ratio and the thickness of the floor of the reinforced concrete frame structure of the anti progressive collapse performance of the research.In this paper, the use of design method for dismantling component method and using ANSYS / LS-DYNA finite element calculation software of a six storey three bay reinforced concrete frame structure model for simulation and analysis, analysis of the change of beam to column stiffness ratio and the change of the thickness of slab on the progressive collapse performance of impact resistance of reinforced concrete frame structure. The main work of this paper is as follows:(1) This paper briefly introduces the concept, background and current research situation of the progressive collapse of the building structure, and introduces the importance of the beam column line stiffness ratio and the thickness of the floor.(2) Using the finite element method of basic theory and ANSYS / LS-DYNA finite element software to establish the model of reinforced concrete frame structure, selection of the appropriate beam column element, plate element and foundation unit, and gives a reasonable grid units size division of the frame structure, the demolition of a component method, and the reinforced concrete frame structure progressive collapse is simulated effectively.(3) A six storey three bay reinforced concrete frame structure model are built up, respectively, considering the beam in order to ensure the "strong column and weak beam" and specification range, the beam from the maximum and minimum values of the performance to resist progressive collapse of reinforced concrete structures. The analysis results show that the increase of the beam column line stiffness ratio and the increase of the beam column line stiffness ratio can increase the stability of the structure and can significantly increase the seismic performance of reinforced concrete frame structures. It shows that the beam column line stiffness ratio has an important influence on the performance of reinforced concrete frame structure.(4) A model of reinforced concrete frame structure with three layers and six spans is established, and the influence of the maximum and minimum values of the plate thickness on the progressive collapse resistance of reinforced concrete structures is established. Analysis results show that if the increase of the floor thickness, the collapse of reinforced concrete frame structure time slowing that if the increase in thickness, can let the floor to the hanging chain tension, delay time of progressive collapse of reinforced concrete frame structure, for people to escape. Therefore, the thickness of the floor is of great significance to the continuous collapse of reinforced concrete frame structure.(5) The influence of the beam column line stiffness ratio and the thickness of the slab on the progressive collapse resistance of the reinforced concrete frame structure is summarized, and some suggestions are put forward to improve the performance of the reinforced concrete structure.