本文關(guān)鍵詞： 橋梁工程 碳纖維布 斷裂力學(xué) 疲勞 應(yīng)力強(qiáng)度因子　出處：《中國(guó)公路學(xué)報(bào)》2014年11期 　論文類型：期刊論文

【摘要】：在線性漸進(jìn)疊加假定的基礎(chǔ)上,對(duì)碳纖維增強(qiáng)復(fù)合材料(CFRP)加固鋼筋混凝土橋梁的疲勞裂紋擴(kuò)展速率進(jìn)行理論分析,在裂紋擴(kuò)展模型表達(dá)式的基礎(chǔ)上,通過(guò)分析三點(diǎn)彎曲梁應(yīng)力強(qiáng)度因子與等效裂縫長(zhǎng)度之間的關(guān)系,求得裂紋擴(kuò)展速率,進(jìn)而對(duì)CFRP加固橋梁的疲勞壽命進(jìn)行預(yù)估算研究;同時(shí)進(jìn)行了CFRP加固橋梁疲勞裂紋擴(kuò)展試驗(yàn)研究,通過(guò)單、雙層CFRP加固試驗(yàn)梁沿布長(zhǎng)方向的應(yīng)變累積分析,闡述了荷載作用下加固梁裂紋擴(kuò)展速率和擴(kuò)展行為。結(jié)果表明:加固梁在疲勞荷載作用下,CFRP充分發(fā)揮了其抗疲勞特性;從理論計(jì)算結(jié)果與試驗(yàn)值對(duì)比情況看,CFRP加固鋼筋混凝土橋梁疲勞壽命估算理論計(jì)算方法誤差較小,滿足實(shí)際需求。
[Abstract]:On the basis of the assumption of linear progressive superposition, the fatigue crack growth rate of reinforced concrete bridge strengthened by CFRP is theoretically analyzed. On the basis of the expression of crack propagation model, the fatigue crack growth rate of reinforced concrete bridge strengthened by CFRP is theoretically analyzed. By analyzing the relationship between stress intensity factor and equivalent crack length of three-point bending beam, the crack propagation rate is obtained, and the fatigue life of bridge strengthened by CFRP is studied in advance. At the same time, the fatigue crack growth test of bridge strengthened by CFRP is carried out, and the strain accumulation analysis of single and double layer CFRP strengthened test beams along the direction of the length of the bridge is carried out. The crack growth rate and propagation behavior of strengthened beams under fatigue load are described. The results show that CFRP can give full play to the fatigue resistance of strengthened beams under fatigue load. According to the comparison between the theoretical calculation results and the experimental results, the theoretical calculation method for the fatigue life estimation of reinforced concrete bridges strengthened with CFRP has a small error, which meets the actual needs.
【作者單位】： 東北大學(xué)資源與土木工程學(xué)院;遼寧交通規(guī)劃設(shè)計(jì)院;
【基金】：國(guó)家自然科學(xué)基金重大項(xiàng)目(90915005)
【分類號(hào)】：U441.4;U445.72
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本文編號(hào)：1528023