Test Research And Simulation Analysis Of Steel Tube-Confined Concrete Short Column Under Axial Impact

The steel tube-confined concrete can develop the performance of concrete and steel tube fully depending on the interaction of two materials under load. It has many excellent characteristics such as high bear force, good anti-seismic performance and convenient construction. Along with the swift development of the economic construction of our country and increasingly raise of high and exceed high building, long span bridge, heavy-duty industrial workshop, the application of the steel tube-confined concrete is also extensive. However, the research of the dynamic property of the steel tube-confined concrete is still in the state of hysterics. Now the study is only confined to respond under seismic load and dynamic steady problem, but other dynamic load forms don't have be enough studied, especially explode, impact etc. Impact phenomenon is very common, and the building is not exceptional. After AmericanNew York "9.11" incident, people beginning solicitude respond of large building structure suffered impact load and its protection design. Especially the major bearing component such as structural column should be more carry out the research in the aspect of impact because the consequence result by break is very serious.Therefore this paper has systematically carried out the steel tube-confined concrete short column axial impact text for the first time. The 16 steel tube-confined concrete short columns are selected and their dynamic respond under axial impact load are studied. Through the text, we can measure the curve of impact force changed with time, the curve of impact acceleration at test piece top, the curve of longitudinal and ring strain at the surface of steel tube. Through compare the plasticity strain at the surface of steel tube, the critical impact energy when the test piece accrue plasticity deform have be found. Through observing the deform of steel tube-confined concrete short column under axial impact load, the deformed regularity with the change of impact speed is summarizedIn this paper, A series of comparison text also has be carried out except having carried out the axial impact text of the steel tube-confined concrete short column, including: The still load test of same kind of test piece, the axial impact test of short concretecolumn and the axial impact test of short steel tube column. Through comparing the test result, it can be proofed that the steel tube-confined concrete structure has very high bear capacity and plastic deformed ability under impact load, so it is a kind of ideal structural material to bear impact.On the foundation of test, the axial impact test of steel tube-confined concrete is simulated using the large-scale finite element software ANSYS/LS-DYNA. Through comparing the test result and the corresponding simulated result, the basic method that imitating the steel tube-confined concrete by the software is summarized.On this foundation, by computer simulation method, the axial impact test of steel tube-confined concrete is expanded to reach more basic regularity of this material. This program has offered the test data and the analysis method of finite element to study this kind material further.