Parametric study on structural behavior of tubular K-joints under axial loading at fire-induced elevated temperatures

被引:23
作者
Dodaran, Neda Azari [1 ]
Ahmadi, Hamid [1 ]
Lotfollahi-Yaghin, Mohammad Ali [1 ]
机构
[1] Univ Tabriz, Fac Civil Engn, Tabriz 5166616471, Iran
关键词
Static strength; Tubular K-joint; Axial loading; Elevated temperature; Parametric equation; STATIC STRENGTH; T/Y-JOINTS; T-JOINTS; COLLAR PLATE; RESISTANCE; DOUBLER; PERFORMANCE; CAPACITY;
D O I
10.1016/j.tws.2018.06.014
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Present research used the results of 405 finite element (FE) analyses to study the effect of the joint geometry on the ultimate strength and initial stiffness of tubular K-joints subjected to axial loading at fire-induced elevated temperatures. The FE models were validated against the data available from experimental tests. Structural behavior under different temperatures (200 degrees C, 400 degrees C, 500 degrees C, and 700 degrees C) was investigated and compared to the behavior at ambient temperature (20 degrees C). Results showed that by increasing the temperature, the ultimate strength and initial stiffness may decrease drastically. On average, the reduction of ultimate strength is 5%, 19%, 51%, and 83% at 200 degrees C, 400 degrees C, 550 degrees C, and 700 degrees C, respectively. A parametric study was conducted to investigate the effect of dimensionless geometrical parameters (beta, gamma, theta, and tau) on the ultimate strength and initial stiffness. Afterwards, ultimate strength data extracted from the FE analyses was compared with the values calculated from the equations proposed by available design codes in which the ultimate strength of the joint at elevated temperatures is obtained by replacing the yield stress of the steel at ambient temperature with the corresponding value at elevated temperature. It was indicated that this method may not have acceptable accuracy for carbon steel K-joints under axial loading. Hence, a new design formula was developed, through nonlinear regression analyses, to determine the ultimate strength of K-joints subjected to balanced axial loads at elevated temperatures.
引用
收藏
页码:467 / 486
页数:20
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