Space Nonlinear Analysis On Progressive Collapse Of The Large Span Portal Frame

Light steel structure industry is widely used in China. Due to the vigorous development of economic and promotion of manufacture industry.Steel portal frame is very important of the light steel structure. It has the incomparable advantage of other structure, the building style is flexible, can be large space design; Energy saving effect is good; material have good ductility; High performance to price; Construction period is short., Steel portal frame are widely adopted in range of area, including the single industrial workshop, super market, the exhibition hall, the warehouse and all kinds of different types of industry. The portal steel frame at home and abroad even had a different types, different reasons collapse, caused heavy casualties and economic loss. Therefore, the researchers pay attention to collapsing on portal Steel Frame structure.In order to research the portal steel frame structure after the collapse of the performance analysis, making using of SAP2000to analyze the structure based on forefathers’study. Key analysis remaining structure of the continuous collapsed performance due to failure of different columns, providing the better theory for the portal steel frame of the technique rules. It has certain practical engineering significance on specific reinforcement and collapse prevention in the construction of structure and use process. The main content of this paper listed following:(1) Carrying out the nonlinear static method for the space analysis, bringing the vertical load to the structure by pushover style. In the demolished component method, Comparing the change of stress performance and development order of plastic hinge in failure of different column case, and pointing out that whether to produce continuous collapse phenomenon, Calculating the ductility of column-removed point and the biggest beam-column plastic corner near component, And finding the weak component.(2) Carrying out the nonlinear dynamic for the space analysis, Due to failure of column B4, Describing moment time history curves of beam axis force、bending moment and column axial force near the column B4, Comparing time history curves of column-removed point.