钢筋混凝土梁柱节点的加固方式对力学性能的影响

Influence of Reinforcement Method of Reinforced Concrete Beam and Column Joints on Mechanical Properties

荷载、环境等因素的不断变化,会使得混凝土柱的耐久性、强度和刚度引起下降。梁柱结构作为建筑中的主要承重部位,由于建筑老化、自然灾害等原因,梁柱结构可能受损,导致其承载能力不足。因此,采取适当的加固措施来增强梁柱结构的稳定性和承载力显得尤为重要。混凝土梁柱节点的加固方式有很多种,其中采用粘贴钢板加固法和粘贴复合纤维材料加固的方法较多。利用Abaqus软件建立节点模型,分析钢梁柱节点的滞回曲线、耗能曲线、骨架曲线和刚度退化曲线,对粘贴钢板加固节点法和粘贴碳纤维加固节点法这两种方法进行合理的计算与建模,将使用加固方式后的梁柱节点与未加固的试件进行抗震性能对比。研究发现,采用两种加固方式的梁柱节点试件的抗震性能和抗剪能力不同程度的得到提高。采用不同加固方法的技术的可行性和优缺点。经过对相关技术性能指标对比分析,优选其加固方案。结果表明:增大截面加固法对梁柱节点承载力提高最大;碳纤维布加固法对整体框架的屈服强度提高最大;外包预应力钢带加固法对梁柱节点的耗能能力和延性性能有显著提高。对比分析认为,外包预应力钢带加固法较其他方法效果更好,应作为优选方案考虑。

The constant change of load, environment and other factors will cause the durability, strength and stiffness of concrete columns to decrease. As the main load-bearing part of the building, it is particularly important to take reinforcement measures. There are many ways to reinforce concrete beam and column nodes, among which there are many methods of pasting steel plate reinforcement and pasting composite fiber materials. The joint model is established by Abaqus software, the hysteresis curve, energy dissipation curve, skeleton curve and stiffness degradation curve of steel beam and column nodes are analyzed, and the two methods of pasting steel plate reinforcement joint method and carbon fiber reinforcement joint method are reasonably calculated and molded, and the seismic performance of the beam and column joints after reinforcement is compared with the unreinforced specimens. It is found that the seismic performance and shear resistance of the beam and column joint specimens using two reinforcement methods are improved to varying degrees. Feasibility and advantages and disadvantages of technologies with different reinforcement methods. After the comparative analysis of relevant technical performance indicators, the reinforcement scheme is optimized. The results show that the increasing section reinforcement method increases the bearing capacity of the beam and column joints the most. The carbon fiber cloth reinforcement method improves the yield strength of the overall frame the most;the outer prestressed steel belt reinforcement method significantly improves the energy dissipation capacity and ductility performance of the beam and column joints. The comparative analysis shows that the outsourcing prestressed steel belt reinforcement method has better effect than other methods and should be considered as the preferred solution.