本文關(guān)鍵詞：碳纖維布與高溫后混凝土界面黏結(jié)性能試驗(yàn)研究　出處：《建筑結(jié)構(gòu)學(xué)報(bào)》2015年08期 　論文類型：期刊論文

  更多相關(guān)文章： 混凝土 CFRP布 高溫后加固 正拉試驗(yàn) 剪切試驗(yàn) 黏結(jié)性能 本構(gòu)模型

【摘要】：通過35個(gè)正拉試件和44個(gè)單剪試件的試驗(yàn)研究,考察了CFRP布與高溫后混凝土界面黏結(jié)性能受過火溫度、恒溫時(shí)間、冷卻方式、粘貼長度、粘貼寬度、粘貼層數(shù)等參數(shù)的影響規(guī)律。根據(jù)試驗(yàn)結(jié)果進(jìn)行回歸擬合,建立了CFRP布與高溫后混凝土界面正拉黏結(jié)強(qiáng)度與過火溫度的關(guān)系式,提出了分別基于雙曲線模型和基于Popovics模型的CFRP-高溫后混凝土界面黏結(jié)滑移本構(gòu)模型,并給出了曲線的特征參數(shù)值。結(jié)果顯示:正拉黏結(jié)強(qiáng)度隨過火溫度的升高而降低,噴水冷卻后試件的正拉黏結(jié)強(qiáng)度較自然冷卻后的進(jìn)一步降低,經(jīng)歷300℃、500℃高溫作用后的混凝土試件,自然冷卻和噴水冷卻后正拉黏結(jié)強(qiáng)度較常溫時(shí)分別降低了4.1%、30.8%和11.0%、40.4%。當(dāng)過火溫度小于500℃時(shí),試件的極限黏結(jié)荷載隨粘貼長度的加長呈先上升后下降的趨勢,且在粘貼長度為130 mm時(shí)達(dá)到最大。當(dāng)過火溫度為500℃時(shí),極限黏結(jié)荷載隨粘貼長度的增加而增加,同時(shí)由于表層黏結(jié)劑滲入到混凝土孔隙內(nèi)部進(jìn)而提高黏結(jié)滑移性能,出現(xiàn)高溫后極限黏結(jié)荷載大于常溫下的情況。CFRP布與高溫后混凝土間的界面黏結(jié)-滑移關(guān)系曲線經(jīng)標(biāo)準(zhǔn)化處理后大體相同。
[Abstract]:Based on the experimental study of 35 normal tensile specimens and 44 single shear specimens, the interfacial bond properties of CFRP cloth and high temperature concrete are investigated, such as overfire temperature, constant temperature time, cooling mode, paste length and paste width. According to the experimental results, the relationship between the positive tensile bonding strength and the overfire temperature of the interface between CFRP cloth and high temperature concrete is established. Based on hyperbolic model and Popovics model respectively, CFRP- concrete interface bond slip constitutive model after high temperature is proposed. The characteristic parameters of the curve are given. The results show that the positive tensile bonding strength decreases with the increase of overheating temperature, and the positive bond strength of the sample after spray cooling decreases further than that after natural cooling, and goes through 300 鈩，

本文編號：1383028