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王震強
(甘肅省交通規(guī)劃勘察設(shè)計研究院有限責任公司，蘭州730030)[摘要] 采用有限元分析方法，模擬預應力碳纖維布加固鋼筋混凝土梁，建立了經(jīng)試驗數(shù)據(jù)對比論證的有限元分析模型。對影響預應力碳纖維布加固鋼筋混凝土梁承載性能的三個因素：碳纖維彈性模量、厚度、預應力大小進行了分析，得出了各因素的影響規(guī)律。對混凝土開裂荷載，預應力大小變化影響較大，碳纖維布彈性模量及厚度變化影響較小；對延緩鋼筋屈服，三個因素都起到一定的作用，相差并不明顯；而對梁極限荷載，施加過大的預應力會導致碳纖維布過早破壞而使整個梁達到極限承載能力，故提高碳纖維布彈性模量和厚度能更有效地增強加固梁的極限承載能力。經(jīng)分析后得出的結(jié)論對預應力碳纖維布加固混凝土梁的工程應用具有一定的指導意義。
[關(guān)鍵詞] 預應力；碳纖維布；加固；受彎性能；有限元分析Nonlinear finite element analysis on flexural bearing capacity of RC beams strengthened with prestressed CFRP
Wang Zhenqiang
(Gansu Provincial Transportation Planning Survey and Design Institute Co., Ltd., Lanzhou 730030, China)Abstract: Finite element method to simulate the pre-stressed CFRP reinforced concrete beams, the establishment of a finite element analysis model by the test data comparison. On the impact of strengthened with prestressed CFRP sheets bearing capacity of reinforced concrete beams of the three factors (carbon fiber elastic modulus, thickness, size of pre-stressed) were analyzed the impact of the law; That the cracking load of concrete, prestressed change the size of the larger, and the elastic modulus of CFRP and thickness change was less affected; Three factors for delayed reinforcement yield play a role are not obvious difference; As for the beam ultimate load, because the imposition of excessive pre-stressed CFRP will lead to premature destruction of the entire beam reached the limits of carrying capacity, compared with carbon fiber sheet to increase the elastic modulus and thickness of reinforcement is more effective to enhance the beam the linuts of carrying capacity. This article analysis the conclusions of the prestressed CFRP reinforced concrete beams have a certain engineering application guide.
Keywords: prestressing;carbon fiber sheet;reinforcement; flexural behavior; finite element analysis
