Fire resistance behavior of earthquake-damaged tubular T-joint reinforced with square doubler plate under fire

Abstract

Abstract: Based on the numerical analysis model of tubular T-joint reinforced with square doubler plate verified by existing experimental tests, by introducing damage variable and considering the parameters, such asdiameter ratio, diameter-to- thickness ratio,wall thickness ratio, doubler plate length-to-brace diameter and doubler plate thickness-to-chord thickness, fire resistance of tubular T-joint reinforced with square doubler plate was analyzed under post-earthquake fire. The results show that the critical temperature of tubular T-joint reinforced with square doubler plate is affected by the damage variable, and the critical temperature decreases linearly with the increase of the damage variable; diameter ratio, diameter-to- thickness ratio, wall thickness ratio and doubler plate thickness-to-chord have little influence on the critical temperature of the tubular T-joint reinforced with square doubler plate; doubler plate length-to-brace diameter has a great influence on the critical temperature of the tubular T-joint reinforced with square doubler plate, and the critical temperature of the tubular T-joint reinforced with square doubler plate decreases with the increase of this ratio.

Key words: post-earthquake fire, tubular T-joint, square doubler plate, damage variable, fire resistance, critical temperature

CLC Number:

TU391

XU Ji-xiang, YANG Long-long, HAN Jian-ping, TONG Yi-ge. Fire resistance behavior of earthquake-damaged tubular T-joint reinforced with square doubler plate under fire[J]. Journal of Lanzhou University of Technology, 2021, 47(5): 130-137.

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