To study the fire resistant behavior of L-shaped concrete-filled steel tubes with steel bar stiffeners under fire

firstly

a finite element model

the predicted temperature distribution of which is in good agreement with the test results

is developed by using ABAQUS.Then

we obtain the data of temperature distribution and analyse the results that the temperature decreases along the path from the surfaces to the center of the cross-sections under fire

and the temperature of external corners is higher than that of internal corner and the increase of temperature of steel bars delays drastically

and the temperature of center decreases much more than both ends.Finally the heating time

the cross-sectional dimensions

the diameter of steel bar stiffeners are taken into account.The analysis indicates that as the increase of the heating time

the temperature of tubes

concrete and steel bar stiffeners rises in different speeds

and the larger the crosssection is

the lower the temperature of the cross-section is

however

the diameter of steel bar stiffeners has negligible effect on the temperature of concrete and steel tube

but has marked effects on the temperature of steel bar stiffeners.