本文選題：再生保溫混凝土 + 再生粗骨料　； 參考：《太原理工大學(xué)》2015年博士論文

【摘要】：隨著國家對建筑節(jié)能要求的不斷提升，綠色節(jié)能型建筑逐步成為社會關(guān)注的焦點及未來建筑發(fā)展的主流，以保溫混凝土為代表的自保溫結(jié)構(gòu)體系以其在全壽命周期中衍生出的多種優(yōu)勢成為目前綠色節(jié)能型建筑材料研究的熱點。由于建筑業(yè)的高速發(fā)展對建筑原料需求的增加對資源的消耗和環(huán)境的損害日益增加，建筑廢料的循環(huán)利用成為目前建筑業(yè)急需解決的焦點問題，由建筑原材料中回收利用再生骨料在國外已經(jīng)開始普及并在國內(nèi)開始推廣，利用再生粗骨料生產(chǎn)的再生保溫混凝土，具有良好的自保溫性能，導(dǎo)熱系數(shù)可達到0.35W/(m·K)以下，是一種新型“綠色混凝土”，是未來我國混凝土材料的發(fā)展趨勢。關(guān)于再生混凝土的力學(xué)特點與抗震能力，國內(nèi)已有眾多的相關(guān)研究，但對再生保溫混凝土結(jié)構(gòu)抗震性能的研究則是空白，再生保溫混凝土既使用了再生粗骨料，，同時又摻加了具有保溫性能的輕集料，所以對其承重與抗震性能的研究就顯得尤為必要。本文以再生保溫混凝土為研究對象，主要內(nèi)容包括： （1）對再生保溫混凝土的抗壓強度分布規(guī)律及受壓應(yīng)力應(yīng)變?nèi)�變化規(guī)律進行試驗研究。大量的試驗數(shù)據(jù)表明，再生保溫混凝土的立方體抗壓強度符合正態(tài)分布。再生粗骨料對再生保溫混凝土的立方體抗壓強度分布規(guī)律的影響程度要遠(yuǎn)大于�；⒅閷υ偕鼗炷亮⒎襟w抗壓強度的影響，強度為35MPa的再生保溫混凝土彈性模量為2.13×104N/mm2。 （2）采用掃描電鏡（SEM）對再生保溫混凝土的微觀結(jié)構(gòu)及各級荷載作用后的內(nèi)部微裂縫發(fā)展及分布規(guī)律進行觀察，并分析了其形成原因及影響因素，以對再生保溫混凝土宏觀性能進行解釋。結(jié)果表明，隱藏于再生骨料內(nèi)部的由破碎所造成不可見的損傷，包括骨料及界面區(qū)，成為整個結(jié)構(gòu)體系的薄弱區(qū)，納米級與微米級微粉活性摻合料使界面區(qū)孔洞的數(shù)量與尺寸都大為減少，�；⒅榈慕缑娌⒉皇窃偕鼗炷林凶畋∪鯀^(qū)。 （3）通過對36個試件進行中心拉拔試驗并擬合出鋼筋與混凝土之間粘結(jié)強度與滑移之間的關(guān)系曲線。試驗結(jié)果表明，再生保溫混凝土的低彈性模量造成拉拔初期鋼筋與混凝土之間的握裹力略低于普通混凝土。變形鋼筋與再生保溫混凝土之間的粘結(jié)強度略大于普通混凝土，峰值滑移量較小，其粘結(jié)強度受水泥漿強度的影響較大，當(dāng)變形鋼筋直徑較大時，再生保溫混凝土的破壞面出現(xiàn)沿骨料內(nèi)部斷裂的現(xiàn)象。 （4）本文對十面不同參數(shù)的混凝土剪力墻進行擬靜力試驗，變化的參數(shù)包括：混凝土材料、剪跨比、軸壓比及邊緣縱筋配筋率，研究了低周反復(fù)荷載作用下再生保溫混凝土剪力墻試件(GSW)的不同設(shè)計參數(shù)對其抗震性能的影響。結(jié)果表明，GSW在不同加載階段的承載力均略有提升，峰值位移明顯高出普通混凝土剪力墻試件(SW)。GSW的剪跨比越大其良好的延性表現(xiàn)的越明顯；隨著軸壓比的增加，承載力的提升幅度越來越小，對延性的損耗程度則越大；增加暗柱配筋率對GSW壓側(cè)的主壓應(yīng)力提升較為明顯；同樣荷載作用下，再生保溫混凝土具有更大的塑性變形能力，內(nèi)部鋼筋受力更加均勻。 （5）利用ANSYS有限元軟件對試驗試件進行非線性分析。分析結(jié)果與試驗結(jié)果吻合較好，為再生保溫混凝土剪力墻參數(shù)擴展分析提供了有效手段。 （6）結(jié)合國內(nèi)外剪力墻力學(xué)分析理論，從試驗的基礎(chǔ)上總結(jié)出適用于再生保溫混凝土剪力墻承載力及頂點水平位移的量化計算及評估方法。再生保溫混凝土剪力墻結(jié)構(gòu)的變形能力是非線性階段需要重點關(guān)注的特征。本文在試驗基礎(chǔ)上對再生保溫混凝土剪力墻受力各特征階段的截面曲率、截面位移角與頂點位移的計算方法進行了探討，對各估算公式進行驗算和調(diào)整，提出了以彎曲變形為主的高剪跨比再生保溫混凝土的恢復(fù)力曲線模型，并給出所有剪力墻的彈塑性位移及彎曲剪切位移的分項計算公式，計算結(jié)果與試驗值吻合良好。
[Abstract]:With the continuous improvement of energy saving requirements of the country, the green energy-saving building has gradually become the focus of social attention and the mainstream of future architecture development. The self thermal insulation structure system represented by thermal insulation concrete has become a hot spot in the research of green energy saving building materials because of its many advantages derived from the whole life cycle. The increasing demand for construction materials increases the consumption of resources and the damage to the environment. The recycling of building waste has become the focus of the construction industry. The recycling of recycled aggregate in the raw materials of the building has been popularized in foreign countries and has been popularized in China, and the recycled coarse aggregate is used. The recycled thermal insulation concrete has good self thermal insulation performance and the thermal conductivity can reach to below 0.35W/ (M. K). It is a new type of "green concrete". It is a trend of future development of concrete materials in China. There are many related studies on the mechanical characteristics and seismic capacity of recycled concrete. The research on the seismic performance of the structure is blank. The recycled thermal insulation concrete is used both the recycled coarse aggregate and the lightweight aggregate with thermal insulation properties, so it is particularly necessary to study the load bearing and seismic performance of the recycled concrete.
(1) test the distribution law of the compressive strength of recycled concrete and the variation law of the full curve of compressive stress and strain. A large number of experimental data show that the cube compressive strength of recycled concrete is in accordance with normal distribution. The influence degree of recycled coarse aggregate on the distribution of cube compressive strength of regenerated thermal insulation concrete It is far greater than the influence of vitrified microspheres on the cube compressive strength of recycled heat insulation concrete, and the elastic modulus of recycled heat insulation concrete with strength of 35MPa is 2.13 * 104N/mm2.
(2) scanning electron microscopy (SEM) was used to observe the microstructure of recycled and thermal insulation concrete and the development and distribution of internal micro cracks after loading at all levels, and the reasons for its formation and influencing factors were analyzed in order to explain the macro performance of regenerated thermal insulation concrete. The results showed that the interior of recycled aggregate was caused by the breakage. The invisible damage, including the aggregate and the interface area, becomes the weak area of the whole structural system. The nano and micron grade powder active admixtures reduce the number and size of the hole in the interface area, and the vitrified bead interface is not the weakest area in the recycled thermal insulation concrete.
(3) through the central drawing test of 36 specimens and fitting the relationship between the bond strength and the slip between the reinforced concrete and the concrete, the experimental results show that the low modulus of elasticity of regenerated thermal insulation concrete is slightly lower than that of the ordinary concrete. The bond strength is slightly larger than that of the ordinary concrete, and the peak slip is smaller. The bond strength is greatly influenced by the strength of the cement slurry. When the diameter of the rebar is larger, the fracture surface of the recycled concrete is broken along the aggregate.
(4) the static test of concrete shear walls with ten different parameters is carried out in this paper. The parameters include concrete material, shear span ratio, axial compression ratio and the reinforcement ratio of the edge longitudinal reinforcement. The effects of different design parameters on the seismic performance of the recycled concrete shear wall specimens (GSW) under low cyclic cyclic loading are studied. The results show that GSW The bearing capacity in different loading stages is slightly improved, and the peak displacement is obviously higher than that of the ordinary concrete shear wall (SW).GSW, the greater the shear span ratio is, the more obvious the good ductility performance is. With the increase of the axial compression ratio, the lifting amplitude of the bearing capacity is smaller and smaller, the greater the loss of the ductility is, and the increase of the reinforcement ratio of the dark column to the GSW side. The main compressive stress is improved significantly. Under the same load, recycled heat insulation concrete has greater plastic deformation capacity and internal reinforcement is more uniform.
(5) the nonlinear analysis of the test specimen is carried out by ANSYS finite element software. The analysis results are in good agreement with the test results, which provides an effective means for the analysis of the parameter expansion of the regenerated thermal insulation concrete shear wall.
(6) combining with the mechanics analysis theory of shear walls both at home and abroad, the quantitative calculation and evaluation method is summed up on the basis of the test, which is suitable for the bearing capacity and the horizontal displacement of the reinforced concrete shear wall. The deformability of the regenerated thermal insulation concrete shear wall structure is the characteristic of the nonlinear stage. This paper is based on the test. The calculation method of section curvature, cross section displacement angle and vertex displacement in each characteristic stage of the regenerated concrete shear wall is discussed. The calculation and adjustment of each estimation formula are carried out. The restoring force curve model of the recycled concrete with high shear span ratio with bending deformation is put forward, and the elastoplastic properties of all shear walls are given. The calculated formula of displacement and flexural shear displacement is in good agreement with the experimental data.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TU398.2;TU352.11

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