Progressive Collapse Resistance Performance Analysis Of RC Frame Structure That Considering The Action Of Slab

Since the Ronan Point apartment exploded in1968,the structural progressive collapseunder the occasional loads caused by the extreme events has drown the great attention ofstructure engineering field.The structural progressive collapse often cause huge economiclosses and massive casualties.So,It is a focal point of the research of collapse design that howto prevent the structure collapsed.Although the the research of structural progressive collapseresistance have made great progress,but all the current specification on the research ofstructural progressive collapse resistance performance does not considered the role of thefloor,And the floor slab is an important component of the frame structure,and it plays a crucialrole on structural progressive collapse resistance,so,it is necessary to consider the role of thefloor slab on the research of structural progressive collapse resistance performance.By using nonlinear dynamic analysis,this article simulated the dynamic responses ofprogressive collapsed of the planar frame and spatial frame after removing the bottom columnin different location,and contrasted the action of progressive collapsed between the frame withfloor slab and the frame without floor slab,summarized the destruction rule of progressivecollapsed after removing column in different location,and the influence of floor slab inprogressive collapsed.The main work of this thesis is as follows:(1) Based on the theory of finite element method,this article established the finite elementmodel of reinforced concrete frame structure in ANSYS/LS-DYNA,selected appropriate unittypes and material model,meshed reasonably and control the process of finite elementanalysis,and achieved the method of remove component,simulated the dynamic responses ofprogressive collapsed of the frame structure after removing the bottom column in differentlocation.(2) The analysis object is a RC planar frame with two across three layers,model is dividedinto the frame with floor slab and the frame without floor slab.The dynamic responses ofprogressive collapsed after removing the middle or the perimeter base column aresimulated.the collapse susceptibility of the structure is determined because of the loss of different columns,and the evaluation of influence of structural floor slab on the progressivecollapse-resisting performance of the planar frame is conducted.The analysis resultsshows:the sensitivity of structural progressive collapse after removing the middle basecolumn is more stronger than removing the perimeter base column.(3) The analysis object is a RC spatial frame with three across three layers, model isdivided into the spatial frame with floor and the spatial frame without floor.The dynamicresponses of progressive collapsed after removing the middle column in the long direction,themiddle column in short direction and the internal column are simulated.the evaluation ofinfluence of structural floor slab on the progressive collapse-resisting performance of thespatial frame is conducted.The analysis results shows:the safety of the structure afterremoving the internal column is worst,and the safety of the structure after removing themiddle column of short span is best,the damage and collapse velocity of the spatial frame withfloor is more stronger than the spatial frame without floor.(4) The regular pattern of the planar and the spatial frame structural progressive collapseis summarized,and some suggestions about how to improve the capacity of structuralprogressive collapse-resisting performance is raised.