本文選題：再生混凝土　切入點(diǎn)：多軸　出處：《北方工業(yè)大學(xué)》2017年碩士論文

【摘要】：當(dāng)前,我國(guó)基礎(chǔ)設(shè)施正在加大發(fā)展完善,高速高鐵正快速發(fā)展,大型市政的建設(shè):如污水處理和河壩工程等,上述工程均需要大體積的混凝土。隨著建筑物的使用年限的到達(dá),一些建筑拆除而產(chǎn)生大量的廢棄混凝土。將其渣塊做為骨料攪拌制成再生混凝土(recycled aggregate concrete,RC)可以節(jié)約資源,減少垃圾處理費(fèi)用。也可應(yīng)用在大型構(gòu)筑物之中。再生混凝土既然將應(yīng)用于這些結(jié)構(gòu)中,就必須研究其在多軸應(yīng)力下的強(qiáng)度規(guī)律,研究的成果對(duì)于再生混凝土的設(shè)計(jì)、工程實(shí)際應(yīng)用等有著重要意義。本人在本校結(jié)構(gòu)實(shí)驗(yàn)室澆筑試件,然后運(yùn)至大連理工大學(xué)結(jié)構(gòu)試驗(yàn)室,采用混凝土動(dòng)三軸試驗(yàn)機(jī)進(jìn)行了多種應(yīng)力比狀態(tài)下的再生混凝土單軸和多軸拉壓試驗(yàn)。應(yīng)力組合包括:動(dòng)態(tài)單軸拉伸、動(dòng)態(tài)單軸抗壓、動(dòng)態(tài)雙軸拉-壓、動(dòng)態(tài)三軸拉-壓-壓;加載速率為10-5/s,10-4/s,10-3/s,10-2/s。本文的主要研究工作具體如下:1.進(jìn)行了強(qiáng)度為C20、C40、C60的再生混凝土動(dòng)態(tài)單軸受拉試驗(yàn)。給出了再生混凝土在單軸受拉狀態(tài)下的動(dòng)態(tài)破壞形態(tài)為斷裂破壞,給出了含1參數(shù)的破壞強(qiáng)度公式。再生混凝土動(dòng)態(tài)單軸受拉破壞面更為錯(cuò)落不平。再生混凝土的單軸拉的應(yīng)力應(yīng)變曲線也與普通混凝土有所不同,下降段更為陡峭也與斷裂破壞形態(tài)相吻合。2.進(jìn)行了強(qiáng)度為C20、C40、C60的再生混凝土在不同應(yīng)力比狀態(tài)下(α=σ1:σ2:σ3=0.00:0.05:-1;0.00:0.1:-1;0.00:0.25:-1;0.00:0.50:-1、0.00:1:-1)的雙軸拉壓試驗(yàn)。根據(jù)試驗(yàn)結(jié)果得出了再生混凝土在雙軸拉壓應(yīng)力狀態(tài)下的破壞為拉斷破壞,表現(xiàn)出一定的脆性,破壞的形態(tài)與應(yīng)變速率有關(guān),與應(yīng)力比無關(guān)。破壞的宏觀破壞形態(tài)與骨料替代率的無關(guān)。在雙軸拉壓下的強(qiáng)度值受加載動(dòng)態(tài)速率的影響。加載速率越大抗拉強(qiáng)度越大。在平面坐標(biāo)下,并建立2參數(shù)破壞準(zhǔn)則。主拉方向的應(yīng)力應(yīng)變曲線也與試件的斷裂相吻合。3.進(jìn)行了強(qiáng)度C20、C40、C60的再生混凝土在不同替代率和不同應(yīng)力比狀態(tài)下(α=σ1:σ2:σ3=0.1:1:-1;0.25:-0.25:-1;0.25:-0.5:-1)的三軸拉-壓-壓試驗(yàn)。根據(jù)試驗(yàn)結(jié)果得出了其在三軸拉壓壓應(yīng)力狀態(tài)下的破壞形態(tài)均為斷裂破壞,在三軸拉壓壓下,破壞形態(tài)為拉斷破壞。強(qiáng)度也隨應(yīng)變率的提高而提高。應(yīng)變率越高斷裂面越齊整。根據(jù)試驗(yàn)結(jié)果在八面體應(yīng)力空間狀態(tài)下,建立2參數(shù)破壞準(zhǔn)則公式。主拉方向的應(yīng)力應(yīng)變曲線與斷裂破壞相吻合。
[Abstract]:At present, the infrastructure of our country is increasing and improving, high-speed high-speed rail is developing rapidly, and the construction of large-scale municipal projects, such as sewage treatment and river dam projects, all of which require large volume of concrete. With the arrival of the building's service life, Some buildings are demolished and a lot of waste concrete is produced. Mixing its slag as aggregate to make recycled aggregate concretes can save resources. Reducing the cost of garbage disposal. Can also be used in large structures. Since recycled concrete will be used in these structures, it is necessary to study its strength under multiaxial stress, and the results of the research can be applied to the design of recycled concrete. The practical application of the project is of great significance. I built the test pieces in the structural laboratory of our university and then transported them to the structural laboratory of Dalian University of Technology. Uniaxial and multiaxial tensile compression tests of recycled concrete under various stress ratios have been carried out by using a concrete dynamic triaxial tester. The stress combinations include: dynamic uniaxial tension, dynamic uniaxial compression, dynamic biaxial tension-compression, dynamic triaxial tension-compression; The main work of this paper is as follows: 1. The dynamic uniaxial tensile test of recycled concrete with strength C20 / C40 / C60 is carried out. The dynamic failure mode of recycled concrete under uniaxial tension is given as fracture failure. The failure strength formula with 1 parameter is given. The dynamic uniaxial tensile failure surface of recycled concrete is more uneven. The stress-strain curve of recycled concrete under uniaxial tension is also different from that of ordinary concrete. A biaxial compression test of recycled concrete with strength C20 / C40 / C60 under different stress ratios (偽 = 蟽 1: 蟽 2: 蟽 3: 0. 005: 1: 0.000. 1: 0. 1: 0. 25:-1: 0. 25: 0. 25:-1: 0. 50:-1: 0. 001: 1) was carried out. The results of the tests showed that the recycled concrete should be subjected to biaxial compression. The failure in the state of force is tensile failure, Showing a certain degree of brittleness, the form of failure is related to strain rate, The strength value under biaxial tension and compression is affected by the dynamic loading rate. The higher the loading rate, the greater the tensile strength. The stress-strain curve in the main tensile direction is also consistent with the fracture of the specimen. 3. The triaxial pull-compression compression compression test of recycled concrete with strength C20C40C60 under different substitution rates and different stress ratios (偽 = 蟽 1: 蟽 2: 蟽 3o 0.1: 0.1: 1-1: 0.25: -0.25: -1 0.25: -0.25: -0.5-1) has been carried out under different stress ratios and different substitution rates. (a = 蟽 1: 蟽 2: 0. 1: 0. 1: 0. 25: 0. 25:-0. 25: -0.5-1). According to the test results, it is concluded that the failure patterns of the specimens under triaxial tension and compression stress are fracture failure. Under triaxial tension and compression, the failure form is tensile failure, and the strength increases with the increase of strain rate. The higher the strain rate is, the more uniform the fracture surface is. According to the test results, under the octahedron stress space state, The formula of 2 parameter failure criterion is established. The stress-strain curve in the main tensile direction is in agreement with the fracture failure.
【學(xué)位授予單位】：北方工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU528

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