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根据实际工业厂房钢筋混凝土(RC)框架结构体系的受力特性,采用外包钢加固RC框架梁和梁柱连接节点。运用有限元软件ABAQUS对已有外包型钢加固RC梁试件进行计算分析,取得与试验结果具有较好一致性的计算结果,验证了有限元模型的可靠性。对集中荷载作用下加固前后RC框架梁和梁柱连接节点进行整体建模,并对其承载力和破坏模式进行有限元分析。结果表明,外包钢加固后RC框架梁承载力提高了62.3%,刚度和延性均显著提高,加固后RC梁在集中荷载位置附近发生剪切破坏。
According to the mechanical characteristics of the RC frame structure system of the actual industrial plant, the RC frame beam and the beam-column connection node are reinforced by the steel clad. The finite element software ABAQUS was used to calculate and analyze the existing RC beam specimens with the outer steel reinforcement. The calculated results were in good agreement with the experimental results. The reliability of the finite element model was verified. The RC frame beam and beam-column connection nodes were modeled as a whole before and after reinforcement under concentrated load, and their bearing capacity and failure mode were analyzed by finite element method. The results show that the RC frame beam strengthened with steel-encased steel has an increase of 62.3% in bearing capacity, and its stiffness and ductility are significantly increased. Shear failure of the RC beam occurs near the concentrated load.