Experimental Research And Numerical Analysis On Seismic Performance Of RC Columns After Fire With Damages Caused By Marine Environment

In order to study the anti-seismic performance of the RC column with damages caused by the marine environment after being fired,four full-scale RC columns were designed with the same reinforcement and dimensions.Moreover,different electrochemistry accelerated corrosion tests to simulate marine damages were implemented on each column to acquire the target widths of corrosive cracks which were regarded as the initial damage.Then the columns suffered from fire tests with axial loaded to analyze the changing law of columns temperature distribution during the fire.At last,the experimental study of the anti-seismic performance of the RC,columns were dissected after fire tests compared with numerical analysis to study their degradation of seismic performance.Here are the main works as follows:1)Summarizing the research results domestic and overseas about the fundamental properties of corroded reinforced concrete structures or structures during or after fires to discover issues.2)4 full-scale RC-columns were designed with the same reinforcement and dimensions.Z1,Z2,Z3,Z4.Different widths of corrosive cracks which Z1 was 0.1mm,Z2 was 0.2mm,Z3 was 0.3mm were acquired by electrochemistry accelerated corrosion test to simulate the initial damage while Z4 was the reference without initial damage.3)The four columns were heated under the same condition according to the standard temperature-time curve(ISO834)to study the changing law of temperature distribution and axial deformation with different corrosion damages.4)After the fire test,low-cycle reversed loading test was conducted on each column.During this process,cracking development and failure mode were observed,and frame curves and hysteresis curve were acquired to study the seismic performance.5)The finite element analysis software ANSYS was used to simulate the low-cycle reversed loading test,and the stress deformation cloud map,hysteretic curve and skeleton curve of the columns were acquired due to numerical.Compared with the experimental results,feasibility and accuracy of the computational model were analyzed.