本文選題：再生混凝土　切入點(diǎn)：純剪　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文

【摘要】：本課題屬于國(guó)家自然科學(xué)基金項(xiàng)目“再生混凝土構(gòu)件復(fù)合受力性能和凍融環(huán)境下結(jié)構(gòu)力學(xué)性能試驗(yàn)研究與設(shè)計(jì)方法”（項(xiàng)目批準(zhǔn)號(hào)51278151）的子課題。 對(duì)廢棄混凝土進(jìn)行處理制備成再生骨料，進(jìn)而配制成再生混凝土用于建筑結(jié)構(gòu)中，不僅緩解了天然骨料的需求壓力，減少環(huán)境污染，同時(shí)也產(chǎn)生了良好的社會(huì)經(jīng)濟(jì)效益。在混凝土結(jié)構(gòu)實(shí)際工程中，混凝土處于單軸受壓（拉）或純剪應(yīng)力狀態(tài)的情況較少，經(jīng)常會(huì)處于復(fù)合的應(yīng)力狀態(tài)。因此研究再生混凝土在復(fù)合應(yīng)力狀態(tài)下的破壞準(zhǔn)則具有重要意義。 本文基于混凝土結(jié)構(gòu)構(gòu)件截面上受壓應(yīng)力和剪應(yīng)力聯(lián)合作用的情況，開(kāi)展再生混凝土壓剪復(fù)合受力相關(guān)性研究。試驗(yàn)中采用自主設(shè)計(jì)的加載裝置對(duì)75根再生粗骨料取代率分別為0%，30%，50%，70%，100%的再生混凝土空心圓柱體試件進(jìn)行了純剪和壓剪復(fù)合受力的試驗(yàn)研究�；谝延械幕炷翉�(qiáng)度準(zhǔn)則，利用公式轉(zhuǎn)換，獲得了其各自對(duì)應(yīng)的壓剪復(fù)合受力的表達(dá)式。試驗(yàn)表明：在純剪應(yīng)力狀態(tài)下，再生粗骨料的引入會(huì)降低混凝土的抗剪強(qiáng)度。不同取代率的再生混凝土試件在不同軸壓比下具有相似的破壞形式和剪應(yīng)力—剪應(yīng)變曲線變化規(guī)律。在軸壓比不超過(guò)0.6時(shí)，極限剪應(yīng)力隨著軸壓比的提高而增大，超過(guò)0.6后，抗剪強(qiáng)度出現(xiàn)下降。采用多種強(qiáng)度準(zhǔn)則轉(zhuǎn)換后的表達(dá)式對(duì)壓剪復(fù)合受力的試驗(yàn)值進(jìn)行了誤差對(duì)比分析，確立了以八面體應(yīng)力理論拋物線擬合公式回歸出的結(jié)果作為再生混凝土壓剪復(fù)合受力的破壞準(zhǔn)則曲線方程。 通過(guò)獲取的試件平面壓剪復(fù)合受力破壞強(qiáng)度，，換算出了主應(yīng)力空間下的雙軸拉壓破壞強(qiáng)度。通過(guò)給出的再生混凝土壓剪復(fù)合受力的破壞準(zhǔn)則方程進(jìn)行了28根再生混凝土無(wú)腹筋梁的抗剪承載力試算，對(duì)偏壓構(gòu)件的斜截面承載力計(jì)算公式進(jìn)行了探討，驗(yàn)證了破壞準(zhǔn)則的有效性和實(shí)用性，可為《再生混凝土結(jié)構(gòu)技術(shù)規(guī)程》（編號(hào)：HB130928002）的編制提供依據(jù)。
[Abstract]:This subject belongs to the project of National Natural Science Foundation of China, "Test Research and Design method of Composite Mechanical Properties of recycled concrete members and structural Mechanical Properties under Freeze-thaw Environment" (Project Grant No. 51278151). Waste concrete is treated to produce recycled aggregate, and then recycled concrete is prepared to be used in building structure, which not only alleviates the demand pressure of natural aggregate, but also reduces environmental pollution. At the same time, it also produces good social and economic benefits. In the actual engineering of concrete structure, the concrete is in the condition of uniaxial compression (tensile) or pure shear stress. Therefore, it is of great significance to study the failure criterion of recycled concrete under composite stress. Based on the combination of compressive stress and shear stress on the section of concrete structural members, In the experiment, 75 recycled concrete hollow cylinder specimens with replacement ratio of 0 30% and 50% of recycled coarse aggregate were subjected to pure shear and compression shear by using a self-designed loading device. Experimental study of combined forces. Based on existing concrete strength criteria, The expressions of their respective compression-shear composite forces are obtained by means of formula transformation. The experimental results show that under the pure shear stress condition, When the recycled coarse aggregate is introduced, the shear strength of concrete will be reduced. The specimens with different replacement ratio have similar failure forms and shear stress-strain curves under different axial compression ratios. When the axial compression ratio is less than 0.6, The ultimate shear stress increases with the increase of axial compression ratio, and the shear strength decreases when the axial compression ratio exceeds 0.6. The results of the parabola fitting formula of octahedron stress theory are used as the failure criterion curve equation of recycled concrete. The failure strength of plane compression shear composite force is obtained. The failure strength of biaxial tension and compression under principal stress space is converted. The shear bearing capacity of 28 recycled concrete beams without web reinforcement is calculated by the failure criterion equation of composite compressive and shear forces of recycled concrete. The formulas for calculating the bearing capacity of oblique sections of eccentric compression members are discussed, and the validity and practicability of the failure criterion are verified, which can provide the basis for the compilation of the Technical Specification for recycled concrete structures (No.: HB130928002).
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU528

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