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Fire Resistance of Precast Concrete Sandwich Cladding Panels with FRP Connectors
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摘要: 为了研究无机保温砂浆层对配纤维增强复合材料（FRP）连接件预制混凝土夹心保温墙板抗火性能的影响，通过考虑高温对混凝土、钢筋、FRP材料的影响，在有限元分析软件ABAQUS中建立温度-位移场耦合分析模型，开展标准火灾有限元分析，并与2片配FRP连接件的预制混凝土夹心保温墙板耐火试验结果进行对比，验证了模型的有效性，并进一步开展参数分析，研究了有无平面外荷载和受火时间对墙板抗火性能的影响。研究表明：保温砂浆层可提升预制混凝土夹心保温外挂墙板（PSCP）的热阻能力、抗弯刚度，降低墙板内部的热对流；FRP连接件在受火60 min内轻微损伤，达到玻璃化温度后仍能提供抗剪刚度，所以玻璃化温度对于判断墙板发生连接件破坏是偏保守的温度；增加平面外荷载使墙板挠度变大，但对温度场无明显影响；受火180 min可能将导致FRP连接件丧失与混凝土板的黏结锚固能力。
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关键词:
- 预制混凝土夹心保温外挂墙板 /
- 无机保温砂浆 /
- FRP连接件 /
- 温度-位移场耦合有限元分析 /
- 标准火灾
Abstract: To investigate the influence of the inorganic insulation mortar layer on the fire resistance of precast concrete sandwich panels（PCSPs） with fiber-reinforced polymer （FRP） connectors， a coupled temperature-displacement finite element model was developed using the finite element software ABAQUS by considering the effects of high temperature on concrete， rebars， and FRP materials. Finite element analyses were conducted under standard fire conditions， and the results were validated against fire resistance tests on two PCSPs with FRP connectors. Subsequently， parametric analyses were performed to examine the effects of out-of-plane loading and fire exposure duration. The results showed that the inorganic mortar increased thermal resistance and flexural stiffness but reduced heat convection within the panel. The FRP connectors were slightly damaged while still capable of providing shear capacity， and the glass transition temperature was found to be a conservative indicator of their failure. Although out-of-plane loading led to larger panel deflections， it had no appreciable effect on the temperature distribution. Compared to the 60-minute fire exposure， the FRP connectors were more prone to anchorage failure after 180 minutes of fire exposure. -
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