本文關(guān)鍵詞：鋼筋鋼纖維納米混凝土粘結(jié)及梁受彎性能計(jì)算方法　出處：《鄭州大學(xué)》2017年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 納米SiO_2 納米CaCO_3 鋼纖維 混凝土 粘結(jié)性能 受彎性能

【摘要】：隨著我國(guó)水利水電、海岸海洋、土木建筑、道路橋梁等工程建設(shè)的深入,對(duì)混凝土材料及其結(jié)構(gòu)性能提出了更高的要求�；炷翉�(fù)合化是提高混凝土結(jié)構(gòu)性能、滿足現(xiàn)代化工程建設(shè)需要的有效方法。本文通過(guò)鋼纖維與混凝土細(xì)觀復(fù)合以及納米材料與混凝土微觀復(fù)合,形成鋼纖維納米混凝土,進(jìn)一步研究鋼筋與鋼纖維納米混凝土粘結(jié)性能以及鋼筋鋼纖維納米混凝土梁正截面受彎性能,建立相應(yīng)的計(jì)算模型和公式。主要內(nèi)容如下:(1)通過(guò)164個(gè)粘結(jié)試件的粘結(jié)試驗(yàn),探討了基體強(qiáng)度、鋼纖維體積率、納米材料(納米SiO_2和納米CaCO_3)摻量、鋼筋類型和試件形式對(duì)粘結(jié)破壞形態(tài)、粘結(jié)滑移曲線和粘結(jié)強(qiáng)度的影響,分析了鋼纖維以及納米材料的作用機(jī)理。(2)根據(jù)鋼纖維納米混凝土具有較大變形和裂縫擴(kuò)展能力的特點(diǎn),建立了鋼纖維納米混凝土環(huán)向應(yīng)變和環(huán)向伸長(zhǎng)的表達(dá)式。在此基礎(chǔ)上,將彈性力學(xué)理論、虛擬裂縫理論與鋼纖維納米混凝土軟化模型相結(jié)合,提出了鋼筋與鋼纖維納米混凝土粘結(jié)強(qiáng)度的計(jì)算方法。利用本文及相關(guān)文獻(xiàn)試驗(yàn)得到的粘結(jié)強(qiáng)度結(jié)果對(duì)提出的方法進(jìn)行了驗(yàn)證,同時(shí)分析了保護(hù)層厚度、裂縫數(shù)量和鋼筋直徑對(duì)粘結(jié)強(qiáng)度的影響。(3)通過(guò)對(duì)鋼筋縱向開槽,槽內(nèi)均勻粘貼應(yīng)變片的局部粘結(jié)試驗(yàn)結(jié)果的分析,建立了三次多項(xiàng)式表達(dá)的粘結(jié)應(yīng)力分布函數(shù),得到了各級(jí)荷載作用下鋼筋與鋼纖維納米混凝土粘結(jié)應(yīng)力和相對(duì)粘結(jié)滑移沿粘結(jié)區(qū)段的分布。在此基礎(chǔ)上,提出了能夠較好反映鋼筋與鋼纖維納米混凝土受力過(guò)程的粘結(jié)應(yīng)力-滑移關(guān)系模型。(4)通過(guò)12根鋼筋鋼纖維納米混凝土梁的正截面受彎性能試驗(yàn),分析了基體強(qiáng)度、鋼纖維體積率和納米材料(納米SiO_2和納米CaCO_3)摻量對(duì)梁開裂彎矩、裂縫發(fā)展、跨中截面混凝土應(yīng)變和撓度的影響;考慮梁開裂后鋼纖維對(duì)開裂截面的作用,提出了鋼筋鋼纖維納米混凝土梁正截面承載力的計(jì)算方法及公式;同時(shí),結(jié)合國(guó)內(nèi)外現(xiàn)行規(guī)范,建立了基于有效慣性矩法和解析法的梁截面剛度的計(jì)算方法及公式。
[Abstract]:With the development of water conservancy and hydropower, coastal ocean, civil construction, road and bridge construction in China, the concrete material and its structure performance are required higher. Concrete compounding is to improve the performance of concrete structure. In this paper, steel fiber nano-concrete is formed by micro-composite of steel fiber and concrete and micro-composite of nano-material and concrete. The bond behavior of steel fiber reinforced nanocrystalline concrete and the flexural behavior of steel fiber reinforced nanocrystalline concrete beams are further studied. The main contents are as follows: 1) through the bond tests of 164 bonded specimens, the matrix strength and the volume ratio of steel fiber are discussed. The effects of nano-materials (nanometer SiO_2 and nano-CaCO3), type of steel bar and specimen form on bond failure, bond-slip curve and bond strength. The mechanism of action of steel fiber and nano-material is analyzed. According to the characteristics of steel fiber nanocrystalline concrete with large deformation and crack propagation ability. The expressions of circumferential strain and circumferential elongation of steel fiber nanocrystalline concrete are established. On this basis, elastic mechanics theory, virtual crack theory and softening model of steel fiber nanocrystalline concrete are combined. The calculation method of bond strength between steel and steel fiber nanocrystalline concrete is put forward. The method is verified by the bond strength results obtained in this paper and related literature tests, and the thickness of protective layer is analyzed at the same time. The effect of crack number and steel bar diameter on bond strength. (3) through the analysis of the local bond test results of longitudinal slotted steel bar and uniformly bonded strain gauge in the slot. The bond stress distribution function expressed by cubic polynomial is established, and the distribution of bond stress and relative bond-slip between steel fiber nanocrystals and steel fiber nanocrystals under various loads are obtained. The bond stress-slip relation model of steel fiber nanocrystalline concrete (SFNRC) is proposed, which can better reflect the stress process of steel fiber nanocrystalline concrete (SFNRC). The flexural behavior of normal section of 12 steel fiber reinforced nano-concrete beams (SFNCs) is tested. The effects of matrix strength, volume ratio of steel fiber and content of nano-material (nano-#en0# and nano-CaCO3) on crack moment, crack development, strain and deflection of mid-span concrete were analyzed. Considering the effect of steel fiber on the crack section after beam cracking, the calculation method and formula of normal section bearing capacity of reinforced steel fiber nanocrystalline concrete beam are put forward. At the same time, the calculation method and formula of beam section stiffness based on effective moment of inertia method and analytical method are established in combination with the current codes at home and abroad.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU528;TU37

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本文編號(hào)：1412820