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采用有限元软件ANSYS/Workbench,建立钢结构加腋节点三维有限元模型,通过对比加腋节点和非加腋节点分别在外荷载、温度荷载、热力耦合3种情况下的应力分布规律以及各个方向应变分布,判断节点加腋前后受力的影响和变化。结果显示,在无温度场影响的情况下,加腋可以有效降低梁柱节点最大荷载,使下部节点处塑性铰外移。而在受火情况下,钢梁柱温度曲线呈梯度非线性变化,加腋钢框架升温速度要略慢于非加腋钢框架。施加外荷载时,腋的作用被削弱,上翼缘梁柱节点会比腋与下翼缘连接处更早产生塑性铰。
The finite element software ANSYS / Workbench was used to establish the three-dimensional finite element model of steel structure plus axillary node. By comparing the stress distribution law of axillary node and non-axillary node with the external load, temperature load and thermal coupling, Distribution, to determine the node plus the influence of axillary force and change. The results show that under the condition of no temperature field, the axillary can effectively reduce the maximum load of the beam-column joint and make the plastic hinge of the lower node move outwards. In the case of fire, the steel beam column temperature gradient gradient non-linear changes, plus steel frame heating rate slightly slower than the non-axillary steel frame. When external load is applied, the effect of the axilla is weakened, and the upper flanged beam-column joint will produce a plastic hinge earlier than the junction of the axillae and the lower flange.