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针对火灾下钢管混凝土(CFST)柱-钢筋混凝土(RC)梁节点的力学性能,建立了火灾下节点温度场和力学场分析的有限元模型,并利用已有试验结果验证了有限元模型的有效性。研究了材料参数、几何参数、荷载参数及梁端约束刚度对CFST柱-RC梁节点耐火极限的影响,重点考察了梁端轴向和转动约束刚度对火灾下CFST柱-RC梁节点弯矩-转角关系、转动刚度和截面内力分布规律的影响。结果表明,CFST柱-RC梁节点在火灾下有两种破坏形态:柱破坏和梁板破坏,梁端约束对CFST柱-RC梁节点耐火极限的影响较小,但梁端轴向约束对火灾下CFST柱-RC梁节点弯矩—转角关系、转动刚度和截面内力分布规律的影响显著。
According to the mechanical properties of CFST column-reinforced concrete (RC) beam joints under fire, a finite element model of temperature field and mechanical field of the node under fire is established. The existing experimental results verify the effectiveness of the finite element model Sex. The effects of material parameters, geometrical parameters, load parameters and restraint stiffness at the beam end on the fire resistance of CFST-RC beam joints were investigated. The bending moments of the CFST-RC beam joints under fire and the axial and rotational restraint stiffness were investigated emphatically. Corner relationship, rotational stiffness and the law of internal force distribution. The results show that there are two kinds of failure modes of CFST-RC beam joints under fire: column failure and beam failure. The influence of beam-end restraint has little effect on the fire resistance of CFST-RC beam joints. However, The influence of moment-moment relationship, rotational stiffness and internal force distribution of CFST-RC beam joints under CFST-RC beams is significant.