Low Cyclic Loading Test Of Concrete Filled Steel Tube Colimn Under Acid Rain Corrosion Environment

The research of concrete filled steel tubular structure under acid rain corrosion and seismic performance related to safety and durability problems. There for the research has great realistic and far-reaching significance to the academic and engineering fields.There have a lot deeply researches on the concrete filled steel tube on domestic and abroad, most of the researches of CFST under corrosion are about static mechanics,what`s more, few of researches are about specimens performance of CFST under corrosion environment. For such reasons, this paper conducted a low cyclic loading test of concrete filled steel tubular column after corrosion by acid rain,1、Designed a devise for accelerated corrosion of CFST in acid rain. According to Faraday’s law, there are test of CFST and steel corrosion in accelerate way. Analysis steel degradation law of material by acid rain corrosion.2、Make a invention of ball joint assembly type cyclic loading device and a adjusting screw telescopic Jack system.3、The main parameters of the test is degrees of CFST corrosion, axial compression ratio. 9 corrosion specimens and 3 corrosive-less ones did the low cyclic loading test. Observed the deformation and failure modes of specimens in the test process, and record the detail experimental phenomena.4、 According to the test data, the displacement hysteretic curves, skeleton curves, stiffness degradation curve was draw. The ductility coefficient, viscous damping coefficient was Calculated. Analyzed the bearing capacity, hysteretic behavior, deformation capacity, ductility, stiffness and energy dissipation characteristics of concrete filled steel tubular under acid rain corrosion and axial compression ratio. Use the domestic and foreign concrete filled steel tubular rules to calculated the bearing capacity of concrete filled steel tubular columns under simulated acid rain corrosion,and have a comparison.