ABSTRACT

In the present paper, the fire resistance of two-planar tubular KK-joints reinforced with collar plates is studied and formulated. After establishing a finite element (FE) model and its verification against the results of experimental tests, a total of 1440 numerical simulations were performed on 360 FE models of collar-plate-stiffened two-planar tubular KK-joints at four different temperatures (20, 400, 550, and 700°C). The studied joints were analysed under the axial loading and the reinforcing effect of the collar plate was investigated. Results showed that the resistance enhancement coefficient (R_s) increases by increasing the γ, θ, and τ; while it decreases by increasing the β. Results of the parametric investigation were utilised to establish new design equations to determine the bearing capacity of collar-plate-stiffened two-planar tubular KK-joints under the brace axial loads at fire condition.

摘要

本文研究并制定了带环板加固的两平面管状 KK 接头的耐火性能。在建立有限元 (FE) 模型并根据实验测试结果对其进行验证后，对 360 个领板加筋双平面管状 KK 接头在 4 个不同温度下的 360 个有限元模型（20 、400、550 和 700°C）。对所研究的节点在轴向载荷下进行了分析，并研究了领板的加固效果。结果表明，电阻增强系数（R _s）随着γ、θ和τ的增加而增加；而它随着β的增加而减小. 参数研究的结果被用来建立新的设计方程，以确定在火灾条件下支撑轴向载荷下的领板加筋双平面管状 KK 接头的承载能力。