内嵌CFRP板条加固钢筋混凝土梁的抗火性能试验研究

发布时间：2018-06-10 10:54

本文选题：钢筋混凝土梁 + CFRP板条　；参考：《建筑结构学报》2017年12期

【摘要】：采用外贴碳纤维增强复合材料(CFRP)加固的钢筋混凝土结构,由于CFRP的高温力学性能较差,使得加固后的钢筋混凝土结构存在耐火性能不足的问题。相比而言,将CFRP板条嵌入被加固构件的混凝土保护层之中的嵌入式加固方法,由于外覆混凝土层的保护,CFRP板条的黏结材料可以免受外部恶劣环境、碰撞和火灾的影响,使得加固钢筋混凝土结构在理论上具有更好的抗火性能。为了深入了解内嵌CFRP板条的加固梁在高温下的力学性能,进行了9根内嵌CFRP板条加固梁和2根外贴CFRP布加固及1根未加固的对比梁的高温性能试验,通过ISO 834标准升温试验,研究了4个主要因素,即加固方法(嵌入式/外贴式)、防火保温模式(楔入/单面/三面)、防火材料(超薄型防火涂料/厚型防火涂料)和黏结剂的种类(环氧树脂/氯氧镁水泥)对梁的高温性能的影响。试验结果表明,采用适当的防火保护并选择有效的黏结材料,内嵌CFRP加固钢筋混凝土梁可以达到规范要求的耐火极限。
[Abstract]:The reinforced concrete structure strengthened by externally bonded carbon fiber reinforced polymer (CFRP) has poor mechanical properties at high temperature, which makes the reinforced concrete structure with insufficient fire resistance. In contrast, the embedded reinforcement method in which CFRP sheets are embedded in the concrete cover of strengthened members can protect CFRP sheets from external adverse environment, impact and fire due to the protection of the outer concrete layer. The reinforced concrete structure has better fire resistance in theory. In order to understand the mechanical properties of the strengthened beams with CFRP plates embedded in CFRP sheets at high temperature, the high temperature performance tests of 9 beams strengthened with CFRP plates embedded in CFRP plates, 2 beams strengthened with CFRP sheets and 1 contrast beam without reinforcement were carried out, and the test was carried out by ISO 834 standard. Four main factors were studied. For example, reinforcement methods (embedded / external sticking type), fire insulation mode (wedge-in / one-sided / three-sided), fire resistant materials (ultra-thin fire resistant coatings / thick fire resistant coatings) and types of binders (epoxy resin / magnesium oxychloride cement) The influence of the high temperature property of the beam. The test results show that the reinforced concrete beams strengthened by CFRP embedded with proper fire protection and effective bonding materials can meet the fire resistance limit required by the code.
【作者单位】：同济大学结构工程与防灾研究所;
【基金】：国家自然科学基金项目(51478362)
【分类号】：TU375.1

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