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Experimental investigation and numerical analysis for RC beams strengthened with CFRP after fire damage
Author(s): 
Pages: 79-83
Year: Issue:  2
Journal: JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Keyword:  有限元方法火灾CFRP加固;
Abstract: 结合对结构火灾损伤的分析,采用有限元方法对火灾后CFRP(Carbon Fiber Reinforced Plastics)加固钢筋混凝土梁荷载与应变、挠度的关系进行了数值分析,并与试验结果进行了比较,吻合良好.加固后的混凝土梁在钢筋屈服后,仍然有一定的荷载容量.这种荷载承受能力可一直持续到结构破坏,这主要是碳纤维布在后期发挥的作用,用碳纤维布加固受火后的混凝土梁,能明显提高极限承载力,在钢筋屈服后对梁的刚度有较大幅度的提高.CFRP加固梁在加载过程中裂缝发展较为缓慢,裂缝数量多且密集,裂缝宽度明显小于未加固梁,这是由于CFRP的约束作用限制了梁底及梁侧裂缝的进一步发展,有利于增强梁的刚度.用有限元方法对CFRP加固梁进行分析能够达到比较精确的理论分析结果.该试验与理论分析结果对加固钢筋混凝土梁的研究具有十分重要的参考价值.
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