预制装配式部分钢骨梁柱节点抗火性能分析

Analysis on fire resistance behavior of precast and partial steel beam-column joint

中文关键词: PPSRC梁柱节点  防火涂料  温度场  荷载比  抗火性能

英文关键词: PPSRC beam-column joint  fire-proofing coatings  temperature field  load ratio  fire resistance behavior

中文摘要:

      确定材料高温特性、热工参数以及时温曲线后，建立构件抗火性能分析模型，通过试验结果可验证模型的有效性．基于此，建立预制装配式部分钢骨钢筋混凝土(PPSRC)梁柱节点抗火性能分析模型，进行了PPSRC梁柱节点温度场分析以及耐火极限影响因素分析．研究表明，火灾条件下混凝土表面温度高于其内部温度，且随着深度的增加，温度逐渐降低，PPSRC梁柱节点内的部分钢骨升温速度高于其外层混凝土的升温速度；无防火措施时，PPSRC梁柱节点同一截面的温度分布不均，连接区是PPSRC梁柱节点抗火的薄弱区域；连接区喷涂防火涂料后，其平均温度降低明显，阻热效果良好；荷载比增大后，相应位移增大，耐火极限降低，荷载比超过一定限值时，PPSRC梁柱节点的失效位置发生变化．

英文摘要:

      After determining the high temperature characteristics, thermal parameters and time temperature curve of materials, and establishing the analysis models on the fire resistance behavior of members, the validity of the established model can be verified through experimental results. According to this, the analysis models on the fire resistance behavior of precast and partial steel reinforced concrete (PPSRC) beam column joints are established. Analysis on temperature field and factors influencing fire resistance limit of PPSRC beam column joints is carried out. Research shows that the temperature of concrete surface is higher than that of internal concrete under fire conditions, and the temperature decreases with the increase of depth. The heating rate of partial steel of PPSRC beam column joint is higher than that of the outer concrete. Without fire proofing measures, the temperature distribution in the same section of PPSRC beam column joint is uneven, and the connection area is the weak area of fire resistance of PPSRC beam column joint. After the fire proofing coating is applied in the connection area, the average temperature of the connection area decreases obviously, and the thermal resistance effect is good. As the load ratio increases, the corresponding displacement increases and the fire resistance limit decreases. When the load ratio exceeds a certain limit, the failure position of PPSRC beam column joint changes.