| The special-shaped multicavity concrete-filled steel tube column can be designed into different section,such as L section and T section according to the architectural design,which has the advantages of flexible structural layout avoiding column members from protruding walls for the architectural effect.It is widely used in multi-high-rise housing.With the increase of the population,there are more highrise buildings.The collapse of the structural system will cause a large number of casualties and bring huge economic losses.Progressive collapse of the structure means that the initial failure of the structure causes a disproportionate expansion of the initial failure.The new type of special-shaped multi-cavity steel concrete composite frame high-rise residential structure system is proposed in this paper,but the current research on this kind of structure collapse resistance is very few.So for the study of the collapse resistance of such new type of structure system,this paper has carried on the related experimental study and finite element analysis.on the thorough analysis.It is deeply researched by using the method of the experimental study of continuous collapse performance,combined with the ABAQUS finite element simulation on the progressive collapse process of the structure system,the main research content is as follows:(1)A 16-storey multi-cavity concrete-filled steel tube high-rise house is designed.And the size and span of the steel beam,the section size of the specialshaped column and the material strength of residential composite structure are determined determines.For the special-shaped concrete filled steel tube composite column,the cover joint is designed.In addition,one third scale model test is carried out on the neutron structure of the actual engineering model.The test and loading scheme of the structural system test were determined.(2)A special-shaped multi-cavity steel concrete composite frame with floor slab wae tested for the study of continuous collapse,by using the method of demolition of stele composite frame structure system through the pseudo static test loads.The main parameter varied the structure of system power transmission mechanism in the process of collapse in the column of shift process,and it was analyzed for the distribution of the floor slab crack and the effects of continuous collapse performance,.as the sane as the failure mode of the steel beam and steel cable effect against the influence of the continuous collapse.(3)The ABAQUS was used to develop the modle for the special-shaped cavity more resistant steel concrete composite frame structure system of the continuous collapse process of finite element simulation.The results of finite element modeling was compared with the test results,which proves the abnormity of multi-cavity steel concrete composite frame finite element model is correct.The deeper research wae carried on the stress of the composite frame mechanism;the influences of the floor thickness,the web thickness of steel beam,the flange thickness of steel beam,the concrete strength grade,the thickness of the plate and the tube wall thickness on the collapse resistance of the composite frame structure was discussed. |
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