Analysis Of Progressive Collapse Of The High-rise Reinforced Concrete Frame Structure Under The Condition Of The Double Column Failure

As the rapid development of Chinese economy,Chinese technical level has improved to a great extent. With China having more and more high-rise buildings, building structures are more complex and large-scale than it used to be.At the same time,the higher requirement for the safety of the structure should be needed.In the process of long use,the buildings may suffer from the effect of the load due to accident,such as natural disasters which is the earthquake or the tsunami and unnatural disasters which is the artificial terrorist attacks、the explosion or the impact.In this disaster situation, the structure is likely to produce progressive collapse, which not only caused heavy economic loss, but also bring serious casualties, and also has the bad social influence.It is a very important problem that whether can guarantee the continuous collapse damage will not happen, whether building structure has enough safety,when the actual structures suffers accident load.In recent decades,our country also happen many severe progressive collapse.As more and more attention research on studying on progressive collapse in designing structures by some domestic experts,our country has more and more achievements; In recent years, the designing method of resisting progressive collapse in the structure is added to the specification in our country,including the structure arrangement、construction measures and the stress calculation.There are four methods to analysis the progressive collapse which are linear,linear dynamic method,the nonlinear static method and nonlinear dynamic method,it examines the four methods were compared in this study.In this paper, progressive collapse events should be analysised contrasted removing a column for removing two columns by the finite element software.Studies have shown that it is completely feasible of analysising after removing two columns by the finite element software.It is completely different between removing a column and removing two columns.It does not mean that the structure is fully capable of resisting progressive collapse after removing one column.The effect is better that the method of local resistance enhancement to resist progressive collapse.It is the best way to avoid the progressive collapse as far as possible avoiding component failure of the structure.In a word,it is positive progress which is a countermeasure to avoid progressive collapse in the concrete structure design code GB50010-2010 and technical specification for concrete structures of tall building JGJ3-2010.In a word,it is positive progress which is a countermeasure to avoid progressive collapse in the concrete structure design code GB50010-2010 and technical specification for concrete structures of tall building JGJ3-2010.But the designers should Suggest the appropriate treatment, whether the remaining structure can not collapsed of resisting progressive collapse, after individually removed the around column and the underlying internal column one after another...