本文選題：再生粗骨料 + 混雜纖維混凝土�。� 參考：《延邊大學(xué)》2017年碩士論文

【摘要】：隨著農(nóng)村城鎮(zhèn)化和城市建設(shè)的發(fā)展,大量舊建筑物被拆除重建,繼而產(chǎn)生了大量的建筑垃圾,長久以來給城市的發(fā)展造成了嚴(yán)重的負(fù)擔(dān),為了合理地資源回收再利用,降低環(huán)境污染。目前,國內(nèi)外學(xué)者們將粉煤灰、廢棄混凝土等再利用于混凝土攪拌中。但使用這些循環(huán)資源的混凝土由于強(qiáng)度降低、抗裂性較差,其實(shí)際用用受到限制。據(jù)研究資料表明:纖維可以有效的彌補(bǔ)再生混凝土本身的孔隙率大、密實(shí)度低等缺陷。因此,為了提高再生混凝土梁的抗裂性能,本文通過改變纖維的不同種類、不同長度、不同摻入方式等方法,分析了再生混凝土的基本力學(xué)性能和構(gòu)件梁的抗裂性能,具體試驗(yàn)結(jié)果如下:(1)通過對單摻及混摻不同種類、不同長度的纖維混凝土的力學(xué)性能試驗(yàn)研究發(fā)現(xiàn),混凝土中摻入纖維對抗壓強(qiáng)度影響不大,但可明顯提高劈裂抗拉強(qiáng)度。通過比較各試驗(yàn)組拉壓比值可得出,試驗(yàn)組G12P35組的抗裂性能比較良好。(2)通過比較不同種類單摻及混摻纖維再生混凝土梁的抗裂性能的試驗(yàn)研究得出,摻入纖維的再生混凝土梁與普通混凝土梁具有相似的破壞過程,都經(jīng)歷了彈性、開裂、屈服、極限四個(gè)階段。加入纖維不會(huì)提高構(gòu)件梁的開裂荷載,但一定程度上提高了構(gòu)件的極限荷載。通過分析比較不同梁構(gòu)件的荷載-裂縫寬度、荷載-跨中撓度及裂縫數(shù)量研究發(fā)現(xiàn),混摻纖維對于提高再生混凝土梁的抗裂性能要好于單摻纖維試驗(yàn)組。(3)根據(jù)本次試驗(yàn)結(jié)果,分析《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》中的最大裂縫寬度及撓度公式,引入最大裂縫寬度的影響系數(shù)K及最大撓度的影響系數(shù)N,分別進(jìn)行計(jì)算推導(dǎo)。(4)運(yùn)用ANSYS模擬軟件對混雜纖維再生混凝土梁做有限元分析,將模擬數(shù)據(jù)與計(jì)算數(shù)值進(jìn)行對比分析,得出模擬值與計(jì)算值基本吻合,說明ANSYS有限元軟件對混凝土構(gòu)件的性能分析是適用的。
[Abstract]:With the development of rural urbanization and urban construction, a large number of old buildings have been demolished and rebuilt, resulting in a large amount of construction waste, which has caused a serious burden to the development of the city for a long time. Reduce environmental pollution. At present, scholars at home and abroad will fly ash, waste concrete and other reuse in concrete mixing. However, the concrete using these circulating resources is limited in practical use because of its low strength and poor crack resistance. According to the research data, the fiber can effectively compensate the defects such as high porosity and low compactness of recycled concrete. Therefore, in order to improve the crack resistance of recycled concrete beams, this paper analyzes the basic mechanical properties of recycled concrete and the crack resistance of member beams by changing the different types of fibers, different lengths and different ways of mixing. The concrete test results are as follows: (1) by studying the mechanical properties of fiber reinforced concrete with different types and different lengths, it is found that the addition of fiber in concrete has little effect on the compressive strength, but it can obviously improve the splitting tensile strength. By comparing the tensile and compression ratios of each test group, it can be concluded that the crack resistance of the G12P35 group in the test group is better than that of the test group. (2) by comparing the crack resistance of different kinds of recycled concrete beams with single and mixed fibers, it is concluded that the crack resistance of the test group is better than that of the G12P35 group. The recycled concrete beams mixed with fiber have similar failure process with ordinary concrete beams, and they all go through four stages: elasticity, cracking, yield and limit. Adding fiber does not increase the cracking load of the member beam, but to some extent increases the ultimate load of the member. By analyzing and comparing the load-crack width, load-span deflection and the number of cracks of different beam members, it is found that the crack resistance of recycled concrete beams with mixed fiber is better than that of single fiber reinforced concrete beams. The formula of maximum crack width and deflection in the Code for Design of concrete structures is analyzed. The influence coefficient K of maximum crack width and the influence coefficient of maximum deflection N are introduced to calculate and deduce respectively. The finite element analysis of hybrid fiber regenerated concrete beams is done by using ANSYS simulation software, and the simulation data are compared with the calculated values. The simulation results are in good agreement with the calculated values, which shows that the ANSYS finite element software is applicable to the performance analysis of concrete members.
【學(xué)位授予單位】：延邊大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU37

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