INFLUENCE OF WALL THICKNESS ON FIRE RESISTANT PERFORMANCE OF RECYCLED CONCRETE TUBULAR STRUCTURES
In order to study the fire resistant performance of recycled concrete tubular structures,the test on the fire resistant performance of one normal concrete specimen and two recycled concrete specimens has been carried out.The differences of the fire endurance and temperature field distribution have been analyzed.Based on the experiment,the numerical simulation on temperature fields was processed;the influence of wall thickness on fire resistant performance was studied;the calculated formula of load bearing capacity of the specimens under high temperature was proposed as well.The load bearing capacity and fire endurance of 8 tubular structures with different wall thicknesses and different concrete were analyzed by numerical examples.Results show that comparing to normal concrete tubular structures with the same wall thickness,the fire endurance is a little shorter and the fire resistant performance is a little worse for the recycled concrete specimens.The load bearing capacity,the fire endurance and the fire resistant performance of recycled concrete tubular structures increase with the wall thickness increasing,which is the same as the normal concrete tubular structures.