Theoretical Analysis Of Axial Bearing Capacity And Research On Anti-detonating Quality Of Rectangular CFST Columns With Binding Bars

With the development of society and the pace of urban construction to speed up,we use more and more steel tube concrete composite structure. In recent years, the new combination structure is the binding bar CFCT,it have much research on mechanical property.But the theoretical study of the axial compression bearing capacity still has a certain space. In recent years, The occurrence of terrorist attacks and the gas blast are more, it is necessary to think about the blast load in the design of civil buildings.So this passage research the binding bara and rectangular CFCT,which has goog plasticity, reasonable stress and superior fire resistance. From the following several aspects of research: theoretical analysis of bearing capacity of axial compression; theoretical analysis of dynamic response of explosion shock wave; numerical modeling and analysis of influence factor.I research on systematacially axial compression bearing capacity and antiknock performance of the binding bara and rectangular CFCT.The main research contents and results are as follows:(1)On the study of using twin shear unified strength theory to the axial compression bearing capacity of rectangular concrete filled steel tube stub,considering effect of width thickness ratio of steel pipe on bearing capacity of steel pipe, the carrying capacity of the steel tube is reduced. The influence of constraint rod on the bearing capacity of core concrete is considered. Increasing the bearing capacity of concrete in the core area,we can reach the calculation formula of bearing capacity for the binding bara and rectangular CFCT based on twin shear unified strength theory.(2)Using the fundamental theory of blast load, propagation law of blast wave,simplified method of blast load,the method of equivalent single-degree-of-freedom system and unified theory of concrete filled steel tube,I can reach calculation formula of the maximum dynamic response of the binding bara and rectangular CFCT on the blast load.(3)Using the finite element software of ANSYS/LS-DYNA,I have some numerical simulation for the binding bara and rectangular CFCT and without the binding bara and rectangular CFCT on the blast load.reaching the maximum dynamic displacements of two columns under a given condition,and comparing two displacemengts.Analyzing the equivalent effect force, equivalent strain contour and displacement contour of the binding bara and rectangular CFCT on the blast load by using result consequence of numerical simulation.It can reach the destruction of the whole process and analyze the influence factor of Failure mode.(4) Analyzing eight influence factors which can effect the antiknock performance of the binding bara and rectangular CFCT,that are face blasting face, strength grade of concrete, strength grade of steel, column height, proportional distance, thickness of steel pipe, ratio of length and width of section and constrained rod diameter.Reaching the effect law which each parameter effect the antiknock performance of the binding bara and rectangular CFCT.