Experimental Research On Fire Resistance Performance For RC Columns With Damages Caused By Marine Environment

This paper aims to study the fire resistance capacity of reinforced concretecolumns with marine environment damage under axial compression. In order toestablish the relationship between the damage index and the fire resistanceperformance, the paper analyses how the crack width caused by chloride ion erosionaffects the temperature field distribution of the column section and the mechanicalproperies of steel bars,the life-reactions of concret structure under fire in marineenvironment is reproduced. The numerical analysis is based on the data of chloride ionerosion tests and RC columns fire resistance tests though3RC columns samples Theexperimental findings on fire resistence performance for RC with damages caused byservice loads and earthquake analyzed.The chief content of this paper are as follows:(1) The high temperature thermal and mechanical properties of concrete andreinforced bar were systematically stated by researching the fire resistance tests homeand abroad for supporting the numerical analysis;(2) Some RC columns samples were designed to simulate the marine environmentdamage caused by chloride ion erosion tests. The degree of cracks was record as theinitial index;(3) The corrosion of steel bars is determined by Ferrari,s law and the erosion testof steel bar accurately, and the mechanical properties of corroded steel are evaluated;(4) To study the fire damage and the variation of the temperature field of theconcrete pillars with initial damage, the fire test is done on the reinforced concretecolumns with chloride ion damage.(5) According to the analysis of the measured section temperature distribution andthe high temperature bearing capacity degradation of RC columns, to refine the fireresistance theory and provide a theoretical basis for the reinforcement and repair ofreinforced concrete structure after fire.