【摘要】：纖維聚合筋(FRP)筋輕質(zhì)、高強(qiáng)、耐腐蝕,可以解決鋼筋混凝土結(jié)構(gòu)的銹蝕問題。高韌性水泥基復(fù)合材料(ECC)材料在纖維體積摻量約2.0%的情況下,其極限抗拉應(yīng)變達(dá)到2%以上,具有明顯的應(yīng)變-硬化特性,且對裂縫有著很好的控制能力。當(dāng)兩種材料復(fù)合且協(xié)同工作時,可以優(yōu)勢互補(bǔ),形成了具有很好抗拉性能和裂縫控制能力的復(fù)合結(jié)構(gòu)。為了探明FRP筋-ECC-混凝土復(fù)合結(jié)構(gòu)的力學(xué)性能,本文開展有限元分析,研究ECC-FRP筋的粘結(jié)錨固性能以及FRP筋-ECC混凝土復(fù)合梁的力學(xué)性能；開展試驗研究,探索FRP筋-ECC加固鋼筋混凝土柱在偏心荷載作用下的力學(xué)行為。具體包括以下幾個方面： (1)通過對不同滑移本構(gòu)關(guān)系與試驗數(shù)據(jù)的對比分析,探討適用于FRP筋-ECC的粘結(jié)滑移本構(gòu)模型。 (2)采用非線性彈簧模擬FRP筋與ECC之間的粘結(jié)性能,建立了BFRP筋-ECC拔出試驗的有限元模型,并通過有限元軟件分析比較了FRP筋-ECC和FRP筋-混凝土的粘結(jié)滑移曲線；根據(jù)連續(xù)曲線模型推導(dǎo)了FRP筋錨固長度的計算公式。 (3)建立了FRP筋-ECC-混凝土復(fù)合梁的三維模型,通過有限元與試驗數(shù)據(jù)對比證明該模型的有效性,并在此基礎(chǔ)上,進(jìn)行了一系列的敏感性分析,探究了不同ECC厚度、BFRP筋配筋率以及混凝土強(qiáng)度對復(fù)合梁力學(xué)性能的影響。 (4)利用FRP筋-ECC復(fù)合結(jié)構(gòu)加固鋼筋混凝土(RC)柱,試驗研究了該加固方式對偏心受壓柱的加固效果；利用有限元方法分析了加固柱在偏心荷載作用下的力學(xué)響應(yīng)全過程。
[Abstract]:Fiber reinforced (FRP) bars are lightweight, high strength and corrosion resistant, which can solve the corrosion problem of reinforced concrete structures. The ultimate tensile strain of high toughness cement-based composite (ECC) is above 2% under the condition of about 2.0% fiber volume content, which has obvious strain-hardening property and good control ability to crack. When the two materials are combined and work together, they can complement each other and form a composite structure with good tensile performance and crack control ability. In order to find out the mechanical properties of FRP tendon-ECC- concrete composite structure, finite element analysis is carried out to study the bond anchoring performance of ECC-FRP bar and the mechanical property of FRP tendon-ECC concrete composite beam. To investigate the mechanical behavior of reinforced concrete columns strengthened with FRP tendons and ECC under eccentric loads. The main contents are as follows: (1) the bond-slip constitutive model suitable for FRP tendon-ECC is discussed by comparing and analyzing the different slip constitutive relations and experimental data. (2) using nonlinear spring to simulate the bond behavior between FRP bars and ECC, the finite element model of BFRP tendon-ECC pull-out test is established, and the bond-slip curves of FRP tendon-ECC and FRP tendon-concrete are analyzed and compared by finite element software. Based on the continuous curve model, the formula for calculating the anchoring length of FRP bars is derived. (3) the three-dimensional model of FRP tendon-ECC- concrete composite beam is established. The validity of the model is proved by comparing the finite element method with the experimental data. On the basis of this, a series of sensitivity analysis is carried out, and the different ECC thickness is explored. The effect of BFRP reinforcement ratio and concrete strength on the mechanical properties of composite beams. (4) the reinforced concrete (RC) columns are strengthened with FRP tendon-ECC composite structure, and the effect of the reinforcement on eccentric columns is studied experimentally, and the whole process of mechanical response of reinforced columns under eccentric load is analyzed by finite element method.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU377.9

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本文編號：2386535