發(fā)布時間：2018-01-29 11:36

  本文關鍵詞： HFRP布 HPC梁 DNLC單元 預應力 應力重分布　出處：《復合材料學報》2017年05期 　論文類型：期刊論文

【摘要】：對于不同混雜配比的預應力高性能混雜纖維增強(HFRP)布,建立高性能HFRP布加固高性能混凝土(HPC)梁的雙重非線性分層組合(DNLC)單元模型。根據(jù)實體退化單元理論,采用初應力等參層單元對高性能HFRP布的體外預應力效應進行模擬,同時正確地考慮HPC梁的材料非線性效應以及結構的幾何非線性,驗證DNLC單元分析模型的正確性,并對HPC梁的開裂荷載、普通鋼筋應力、高性能HFRP布應力重分布等進行研究。結合試驗資料分析表明,預應力碳/玻璃纖維混雜(CFRP/GFRP)布加固HPC梁的理論結果與試驗數(shù)據(jù)吻合程度良好,采用等參層單元有效地模擬高性能HFRP布的預應力作用,及所推導的DNLC單元正確性。預應力GFRP纖維布加固的開裂荷載等均較低,預應力CFRP纖維布加固的開裂荷載等有所提高,但剩余強度過大。HPC梁開裂荷載前預應力高性能HFRP布應力發(fā)展緩慢,屈服荷載后,其發(fā)展迅速直至結構失效。
[Abstract]:For prestressing high performance hybrid fiber reinforced HFRP cloth with different mixing ratio. The dual nonlinear delamination combined element model of high performance HFRP sheets for strengthening high performance concrete (HPC) beams is established. The model is based on the entity degradation element theory. The initial stress isoparametric layer element is used to simulate the external prestressing effect of high performance HFRP cloth, and the material nonlinear effect of HPC beam and the geometric nonlinearity of structure are correctly considered. Verify the correctness of DNLC element analysis model, and study the cracking load of HPC beam, stress of ordinary steel bar, stress redistribution of high performance HFRP cloth, etc. The theoretical results of HPC beams strengthened with prestressed carbon / glass fiber hybrid CFRP / GFRP sheets are in good agreement with the experimental data. The isoparametric layer element is used to simulate the prestressing effect of high performance HFRP cloth effectively, and the correctness of the derived DNLC element. The cracking load of prestressed GFRP fiber cloth reinforcement is lower. The cracking load of prestressed CFRP fiber reinforced beams is increased, but the stress of prestressed high performance HFRP sheets is slow to develop before the cracking load, but after yield load. It develops rapidly until the structure fails.
【作者單位】： 南京航空航天大學結構工程與力學系;江西省交通科學研究院;同濟大學橋梁工程研究所;
【基金】：國家自然科學基金(11232007;11272147) 江蘇省自然科學基金(BK20130787) 中央高�；究蒲袠I(yè)務費專項資金(NS2014003)
【分類號】：TB33
【正文快照】： 網(wǎng)絡出版地址:www.cnki.net/kcms/detail/11.1801.TB.20160729.1051.002.html引用格式:張劍,周儲偉,俞博,等.預應力高性能混雜纖維增強布加固HPC梁的DNLC單元研究[J].復合材料學報,2017,34(5):1152-1158.ZHANG J,ZHOU C W,YU B,et al.Research on DNLC element for HPC beams ，

本文編號：1473325