Resistance Of The RC Frame Structure Collapsed Continuity Analysis

The purpose of design is to ensure the safety of the building,we are carrying out structural design,considering the load is mainly dead load,live load,earthquake,wind load.And did not accidentally load into account,but a large number of buildings destroyed engineering examples,these incidents are related and accidental loads.In recent years,the continuity of the collapse of the structure continue to occur,the continuity of the structure collapsed in 1968 from Britain Ronan Point apartment because of a gas explosion caused the beginning,so that domestic and foreign engineering sector for the first time the issue of structural collapse continuity of attention.Research on the issue of continuity of the collapsed structure relatively late start,but also achieved some results.In our latest specification,the anti-progressive collapse design methods and improve the ability of anti-progressive collapse structure preliminary provisions.Terrorist attacks,natural disasters and accidental events are likely to cause damage to the building,so that the continuity of structure collapse.Such damage is often caused by the loss is huge,has brought serious property damage and casualties.Therefore,the continuity of the structure collapsed issue attracted widespread attention of the whole society.This paper reviews the research status of domestic and foreign anti-progressive collapse,analyze and summarize the anti-progressive collapse analysis,refer to domestic and international norms on a regular progressive collapse of RC frame structure analysis.In this paper,a 10-story RC frame structure rules,for example,were introduced linear static,linear dynamic,nonlinear static,nonlinear dynamic analysis methods,the use Sap2000 finite element analysis software,using a linear static analysis methods were removed,the internal forces and the changes in supply and demand ratio discussed structure,and in comparison with the case of the four underlying structural changes in the displacement of the column at different locations.The following conclusions:1)remove the member from the law shows that after a node failure displacement prism reach 80mm,anti-progressive collapse capabilities worst.The ability of anti-progressive collapse structures demolished in the column strongest,followed by the short side of the column,the long side of the column.2)span framework will affect the ability of anti-progressive collapse structures,remove the long side of the column maximum DCR of 1.25 moment beams,columns and beams to remove the short side of the maximum DCR of 1.16.Small span of progressive collapse resistance capacity of the structure is greater than the span of anti-progressive collapse capabilities.3)after removal of the column is connected to the frame beams greatest impact thereto,almost no effect on the adjacent frame.With the increase of the floor,and the calculated bending moment calculated shear decreases.4)on the 10-story framework of rules,after removal of a Genzhu,beam end moments are generally connected to it from negative to positive,and is connected to the column to remove the upper end of the beam DCR value will suddenly increase.So,after removing the bottom of a Genzhu,the greatest impact is vertically connected to its upper beams.5)Because of the regulatory framework of each component force uniform,so the ability of anti-progressive collapse irregular framework,the paper according to our specifications designed frame structure calculations and found that it does not meet the requirements of progressive collapse resistance of structures.