| Steel reinforced ultra-high-strength concrete structure is a new structure which is a combination of steel shape and ultra-high-strength concrete. With the development of high-rise building structure, the use of steel reinforced ultra-high-strength concrete structure is becoming more and more widely. Compared with ordinary steel reinforced concrete structure, the bearing capability, the durability and ductility of this structure are much better. It can better reflect the effect of steel shape, improve the bearing capacity of the structure greatly and gain more economic benefit. So steel reinforced ultra-high-strength concrete column will be the main part in high-rise building structure. At present, although steel reinforced ultra-high-strength concrete column had certain experimental study in our country, the study of its ductility is still imperfect, and finite element analysis simulation study is also relatively less, and the related knowledge of it is a loose aspect. Therefore, the study to the ductility of steel reinforced ultra-high-strength concrete column has objective necessity.Based on ductility test of the existed nine steel reinforced ultra-high-strength concrete columns under low reversed cyclic load, the finite element analysis software ABAQUS is used to simulate the load-displacement curve of it under monotonic static load, and the calculated load-displacement curves are compared with the skeleton curves obtained in the experiment. After comparison and analysis, it is found that the calculated results can gain certain accuracy and reliability. ABAQUS is used to analyze and calculate the load-displacement curve of27specimen of steel reinforced ultra-high-strength concrete column under different shear span ratio, stirrup ratio and axial pressure coefficient, and studies are operated on the influencing factors of ductility, and the formula calculation of displacement ductility coefficient of steel reinforced ultra-high-strength concrete columns is proposed. |
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