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FRP抗弯加固空心板非线性有限元分析及参数研究

DOI: 10.3969/j.issn.1674-0696.2014.01.08, PP. 31-35

Keywords: 纤维增强复合材料,界面剥离,开裂,极限承载力,非线性有限元,fiberreinforcedpolymers,interfacesbonding,cracking,ultimateload-bearingcapacity,nonlinearfiniteelement

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Abstract:

:?以FRP抗弯加固预应力空心板为研究对象,考虑钢筋、混凝土材料本构的非线性以及FRP与混凝土间的界面剥离,进行加固后结构承载能力的非线性有限元分析。分析表明加固后结构的承载力和延性都得到了较大幅度的提高,数值分析结果明显大于按现有规范公式得到的计算值。此外,从混凝土强度、FRP的轴向刚度、FRP材料用量和二次受力4个方面对FRP加固空心板效果进行了参数分析。结果表明:混凝土强度、FRP的轴向刚度对加固效果影响较大;FRP材料用量存在最优用量,超过最优用量后,加固后结构的受力性能并无明显改观;当结构以钢筋屈服和混凝土压碎为破坏形式时,二次受力对钢筋和FRP的应变影响较大,但对整体结构的极限承载力影响较小。

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