- 摘 要
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朱彥鵬1，廖永石1，鄭建軍2，滕文川2，趙丹丹1
(1 蘭州理工大學(xué)土木工程學(xué)院，蘭州730050; 2 甘肅土木工程科學(xué)研究院，蘭州730020)[摘要] 通過4個不同持續(xù)荷載下的CFRP加固梁抗彎試驗，其中1個對比梁，3個不同荷載下的加固梁，試驗結(jié)果表明，加崮梁破壞時平截面假設(shè)近似成立，裂縫寬度和跨中撓度有所減小。分析表明，現(xiàn)有計算公式雖然考慮了滯后應(yīng)變，但滯后應(yīng)變對計算結(jié)果影響很小，這和試驗結(jié)果不太吻合。
[關(guān)鍵詞] 二次受力；滯后應(yīng)變；碳纖維布；抗彎承載力；加固Experimental study on RC beams' bending capacity strengthened with CFRP considering secondary load
ZhuYanpeng1, LiaoYongshi1, Zheng Jianjun2, Teng Wenchuan2, Zhao Dandan1
(1 School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 2 Gansu Science Research Institute of Civil Engineering, Lanzhou 730020, China)Abstract: Four simple supported RC beams (one ofthem is comparative RC beam) strengthened with CFRP have been tested at the different level loads. It was mainly conducted to investigate the effects of CFRP sheets reinforcement of flexural strength. The experimental results indicate that the plane cross-section assumption is nearly right at the ultimate load of the strengthened beam and crack width and deflection of mid span beams decrease visibly. According to the analysis based on the results of the experiments, it is demonstrated that the lagged strain has little affected the results calculating from existing formula, but it does not agree well with experimental results.
Keywords: secondary load; lagged strain; CFRP; flexural capacity; strengthening
