Seismic Performance Analysis Of Steel Reinforced High Strength Concrete Columns

As a new structure formed by combining profile steel and high-strength concrete-combined member of profile steel high-strength concrete, it all advantages of ordinary reinforced concrete structures and can also give full play to intrinsic mechanical properties of the profile steel and can even effectively and remarkably improve bearing capacity per unit area of the structure as well as economic efficiency. Nowadays, there has been increasing number of test and research on profile steel high-strength concrete. However, few of them are researches based on simulation of finite element modeling with adoption of computer and the knowledge system of application of simulation of finite element modeling is not well-conceived enough. Therefore, it requires certain objectivity to simulate anti-seismic performance of profile steel high-strength concrete columns by adopting finite element modeling. Main research contents contained in the document are as follows:(1)In order to realize accurate simulation of mechanical properties of high-strength concrete, a concrete constitutive model has applied to calculate stress-strain value of concrete when being tensioned or pressed and damage factor of the concrete has also been taken into consideration.(2)10 profile steel high-strength concrete columns with different axial pressure ratio, stirrup reinforcement ratio and steel ratio are designed utilizing finite element software ABAQUS to conduct simulation of finite element modeling. Finite element discretization model are adopted for each composing component.(3)Hysteretic curve and skeleton curve of profile steel high-strength concrete columns have been figured out based on finite element calculation. Hysteretic performance of profile steel high-strength concrete columns with different axial pressure ratio, stirrup reinforcement ratio and steel ratio are analyzed according to the calculation result.(4)Displacement ductility ratio, strength attenuation coefficient and equivalent viscous damping ratio have been obtained based on calculation and analysis results of the hysteretic curve and skeleton curve, in order to study anti-seismic property of profile steel high-strength concrete columns with different axial pressure ratio, stirrup reinforcement ratio and steel ratio.(5)A corresponding finite model has been established based on existing literatures to conduct calculation and analysis. Calculation results of finite elements turn out to be consistent with test results based on such literature to a large extent, thus proofing practicability of the designed model containing over 10 different finite elements.