The Study On Seismic Behavior Of Rubber Concrete Filled Circular Steel Tubular Column Under Low-cycle Repeatedly Horizontal Load

The rubber concrete filled circular steel tubular structure is a new style, whichimproves the seismic performance of structures and uses crumb rubber properly.And it is given attention by more and more people. The frame structure equipped withrubber concrete filled circular steel tubular column can not only meet the requirementsof the vertical bearing capacity and deformation but also dissipate a lot of energy bythe viscoelastic properties of the rubber to ensure the safety of the structure when anearthquake occurs. The experimental study and theoretical analysis on seismicperformance of rubber concrete filled circular steel tubular are scant at home andabroad currently. So the seismic behavior of the rubber concrete filled circular steeltubular column will be analyzed and researched through the low-cycle repeatedlyhorizontal load test of each specimen and the simulation with the finite elementsoftware SNAP. The specific work and conclusions are as follows:1. Eight specimens of rubber concrete filled circular steel tubular column aredesigned with rubber content、axial compression ratio、steel content and slendernessratio for the parameters in this paper. And the specimens are tested under low-cyclerepeatedly horizontal load. Then the hysteretic curve between load and displacement、the skeleton curve and the stiffness degradation curve of each specimen are drewaccording to the results. The hysteretic curve between load and displacement of eachspecimen is very full with good energy dissipation capacity and seismic performance.The horizontal bearing capacity and stiffness degradation process are relatively stableand there will be no sudden falling phenomenon according to skeleton curve andstiffness degradation curve of each specimen.2.Through comparison and analysis to hysteretic curve between load anddisplacement and energy dissipation capacity, we discover that with the increase ofrubber content the bearing capacity of the rubber concrete filled circular steel tubularcolumn will decrease, but the energy dissipation coefficient and equivalent viscousdamping coefficient will increase; with the increase of axial compression ratio thebearing capacity and the deformation ability of the rubber concrete filled circular steel tubular column will decrease, and the energy dissipation capacity will also decrease;with the increase of steel content the bearing capacity of the rubber concrete filledcircular steel tubular column will increase, and the ductility performance and theenergy dissipation capacity will also increase; with the increase of slenderness ratio thebearing capacity of the rubber concrete filled circular steel tubular column willdecrease, and the ductility performance and the energy dissipation capacity will alsodecrease.3.Using the finite element software SNAP and according to the test, eachspecimen are simulated. By comparing the calculated results and experimental results,there is a relatively high degree between them. This suggests that the choice of theparameters and the constitutive relation is in line with the actual test conditions whenusing the finite element software SNAP. to simulate. So this software can be used tosimulate seismic analysis.