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针对现浇板显著影响钢筋混凝土梁柱节点的受力性能,但其抗震机理尚未明确,以及低周反复荷载作用下现浇板形成主裂缝后的失效是不含直交梁的钢筋混凝土梁-柱-板边节点破坏模式之一的问题,研究钢筋混凝土梁-柱-板边节点在地震荷载作用下的受力性能,分析现浇板与框架柱相交处的应力,通过假定现浇板不承受来自框架梁的作用力,将其框架边节点中现浇板主裂缝倾角分析简化为平面问题。基于弹性力学位移变分法中的里茨法,忽略现浇板沿厚度方向的应力和应变,将梁-柱-板边节点受力性能分析视为平面应力问题,提出边节点中现浇板的主裂缝倾角的简化力学模型。通过计算现浇板开裂时破坏点的应力状态,并通过该破坏点单元体分析,计算主平面角度,即现浇板与框架柱相交处形成的主裂缝破坏角度。研究结果表明:低周反复荷载下钢筋混凝土梁-柱-板边节点现浇板的主裂缝倾角理论值分别为34.05°和34.19°,与试验结果吻合较好,提出的简化力学模型可用于强震下钢筋混凝土框架节点的受力分析。
However, the seismic mechanism of the cast-in-situ concrete slab is not clear, and the failure of the cast-in-situ concrete slab under the action of low cyclic loading is that of the reinforced concrete beam without columns - One of the failure modes of the plate edge joints is studied. The mechanical behavior of the reinforced concrete beam-column-plate joint under seismic load is studied. The stress at the intersection of the cast-in-situ plate and the frame column is analyzed. The force from the frame beam simplifies the analysis of the main crack dip angle of the cast-in-place slab in the frame side node to a plane problem. Based on the Rietz method in the variational method of elastic mechanics displacement, the stresses and strains in the thickness direction of cast-in-situ slab are neglected. The mechanical behavior analysis of the beam-column-slab joints is regarded as the problem of plane stress. A Simplified Mechanical Model of Main Tilt Inclination. By calculating the stress state of the failure point during the cracking of cast-in-place slab, the main plane angle is calculated through the unit body analysis of the failure point, that is, the failure angle of the main crack formed at the intersection of cast-in-situ slab and frame column. The results show that the theoretical value of the main crack inclination angle of the cast-in-situ concrete slab-column joints is 34.05 ° and 34.19 °, respectively, which is in good agreement with the experimental results. The proposed simplified mechanical model can be applied to strong Stress Analysis of Reinforced Concrete Frame Joints Under Earthquake.