论文部分内容阅读
为研究高温对加肋焊接空心球节点受压承载能力的影响,采用数值模拟方法,对单向轴心受压的加肋焊接空心球节点在高温下的受压性能进行研究,分析焊接空心球节点在轴心受压荷载作用下的破坏模式,得到不同温度下焊接空心球的承载能力。分析结果表明:高温下焊接空心球节点的薄弱部分为钢管与球节点连接处;高温对加肋焊接空心球节点的承载能力有着很大影响,随着温度的升高,承载力逐渐降低,当温度超过400℃以后节点承载力下降迅速,尤其是在节点温度达到700℃时,节点的极限荷载只有常温下的20%左右;随着温度升高,球节点越来越早进入弹塑性阶段。不同厚度的加劲肋在不同温度下呈现不同的变形。
In order to study the effect of high temperature on the compressive loading capacity of stiffened hollow spherical ball joints, the numerical simulation method was used to study the compressive properties of stiffened hollow spherical ball joints subjected to uniaxial axial compression under high temperature. The failure mode of the joint under the axial compression load can obtain the bearing capacity of the welded hollow ball under different temperatures. The results show that the weaker part of welded hollow ball joint is the connection between steel pipe and ball joint at high temperature. The high temperature has a great influence on the bearing capacity of welded hollow ball joint. As the temperature increases, the bearing capacity decreases gradually. When the temperature exceeds 400 ℃, the bearing capacity of the joints drops rapidly. Especially when the joint temperature reaches 700 ℃, the ultimate load of the joints is only about 20% at room temperature. As the temperature increases, the ball joints enter the elastoplastic stage more and more. Different thickness of the stiffener at different temperatures showed different deformation.