Research On The Mechanical Performence Of Concrete Filled Circular Steel Piers To Earthquake Action

As a kind of combination design forms in composite structure, concrete filled steel tubeis proved not only in mechanical properties, but also in seismic behavior, and is appliedwidely in bridges and building structures. More attention is focused on the research on theseismic behavior of concrete filled steel tube both at home and abroad, and explorations aremade mainly from seismic tests by most of the researchers up till the present moment. Testsare essential in the research on the seismic behavior of concrete filled steel tube, and of course,inevitably, some limitation exists, as well as expensive. With the increasingly perfected theoryand calculation method are proposed, so as the development of modern computer technology,Finite Element Analysis is becoming another important method to study on the seismicbehavior of concrete filled steel tube, which can be not only save a lot of money on tests, butalso calculate the seismic behavior of elements under complicated conditions.In this paper, Finite Element Method numerical simulation of some specimens from Pro.Han Linhai is presented firstly, and load-displacement hysteretic behavior of concrete filledcircle steel piers is obtained, which show good agreement with the experimental results, so theaccuracy of the Finite Element Method is proved. Then based on a concrete filled circle steelpiers of an actual bridge,12different piers are designed by reference to specification, andhysteretic behavior of them under cyclic loading are simulated, based on the calculated results,a whole string of hysteresis curves in different diameter/thickness ratio, axial compressionratio and slenderness ratio are obtained. The calculated curves reveal the law of theinfluences of diameter/thickness ratio, axial compression ratio and slenderness ratio on thehysteretic behavior of concrete filled circle steel piers under cyclic loading. The results alsoshow that, concrete filled circle steel piers possess good hysteresis behavior as well as energydissipation capacity, serious load-carrying capacity degeneration would not occur in largedeformation. The degradation of loading and stiffness increases with the increase of theapplied displacement, this shows a reciprocating deformation may cause more damage to theconcrete filled steel tubes when the deformation is large.