本文選題：EPS混凝土　切入點：靜態(tài)力學性能　出處：《太原理工大學》2017年碩士論文　論文類型：學位論文

【摘要】：聚苯乙烯(Expanded Polystyrence,簡稱EPS)混凝土是一種環(huán)境友好型的新型建筑材料,由于其具有輕質(zhì)和保溫隔熱性能良好的特點,目前已被廣泛地應(yīng)用于建筑工程中。因此,其力學行為和本構(gòu)模型成為混凝土材料學科的研究熱點。本文首先試驗研究了不同粒徑(0.5-1mm、2-3mm、5-6mm)、不同置換率(25%、50%、75%)的EPS混凝土靜態(tài)壓縮、劈裂和抗折性能。分析了不同置換率下EPS混凝土的壓縮應(yīng)力應(yīng)變曲線;分析了置換率對抗壓、劈裂和抗折性能的影響;研究了EPS粒徑對混凝土靜態(tài)力學性能的影響;建立了相對抗壓強度、相對抗拉強度與相對密度的關(guān)系;采用單孔試驗研究了EPS顆粒粒徑對混凝土力學性能的影響機理,推導(dǎo)出粒徑大小對混凝土強度影響的理論表達式,使用試驗數(shù)據(jù)驗證了理論模型的有效性。選取粒徑為0.5-1mm、置換率為50%的EPS混凝土作為參照試驗,按照纖維摻入量為0.8kg/m3、1.3 kg/m3和1.8 kg/m3摻入聚丙烯纖維,對試件的抗壓強度、劈裂抗拉強度和抗折強度進行測試。分析抗壓、抗拉和抗折強度隨纖維摻量的變化規(guī)律,并進一步分析纖維對EPS混凝土力學性能的影響機理。選取粒徑為0.5-1mm,EPS置換率為50%、75%的兩組EPS混凝土作為參照試驗,以機制砂等質(zhì)量置換EPS混凝土中的天然河砂,置換率為0、20%、40%、60%、80%。對EPS混凝土抗壓強度和劈裂抗拉強度進行測試。分析抗壓和抗拉隨機制砂置換率的變化規(guī)律并進一步分析機制砂對EPS混凝土力學性能的影響機理。基于彈性損傷和經(jīng)典塑性力學,參照普通混凝土的受壓損傷本構(gòu)模型,提出使用雙折線損傷本構(gòu)模型來描述混凝土的應(yīng)力應(yīng)變關(guān)系,通過試驗所測數(shù)據(jù)確定本構(gòu)模型的特征參數(shù)。并把損傷本構(gòu)曲線和試驗所得應(yīng)力應(yīng)變曲線進行對比,兩者吻合較好,初步驗證了該模型的有效性。為研究EPS混凝土在復(fù)雜載荷作用下的本構(gòu)模型打下基礎(chǔ)。
[Abstract]:Polystyrene expanded Polystyrene (EPS) concrete is a new kind of environment-friendly building material. It has been widely used in construction engineering because of its good properties of light weight and heat insulation. Its mechanical behavior and constitutive model have become a hot research topic in the field of concrete materials. In this paper, the static compression of EPS concrete with different diameters of 0.5-1mm ~ 2-3mm ~ 5mm ~ 6 mm and different displacement ratio of 25mm ~ 50mm / 75) has been studied. The compressive stress-strain curves of EPS concrete under different displacement rates are analyzed, the effects of displacement ratio on compressive, splitting and flexural properties are analyzed, and the effects of EPS particle size on static mechanical properties of concrete are studied. The relationship between relative compressive strength, relative tensile strength and relative density is established, and the influence mechanism of EPS particle size on the mechanical properties of concrete is studied by single hole test, and the theoretical expression of the influence of particle size on concrete strength is deduced. The validity of the theoretical model was verified by using the experimental data. The compressive strength of the specimens was determined by adding 0.8 kg / m 31.3 kg/m3 and 1.8 kg/m3 polypropylene fibers to EPS concrete with a diameter of 0.5-1mm and a replacement ratio of 50%. The splitting tensile strength and flexural strength were tested. The variation of compressive, tensile and flexural strength with fiber content was analyzed. The influence mechanism of fiber on mechanical properties of EPS concrete was further analyzed. Two groups of EPS concrete with a diameter of 0.5-1 mm and a replacement ratio of 50% or 75% were selected as reference tests, and the natural river sand in EPS concrete was replaced with machine-made sand of equal mass. The compressive strength and splitting tensile strength of EPS concrete were tested. The change of replacement rate of compressive and tensile random sand making was analyzed, and the influence mechanism of mechanism sand on mechanical properties of EPS concrete was further analyzed. For elastic damage and classical plastic mechanics, Referring to the compressive damage constitutive model of ordinary concrete, a double broken line damage constitutive model is proposed to describe the stress-strain relationship of concrete. The characteristic parameters of the constitutive model are determined by the experimental data, and the damage constitutive curve is compared with the stress-strain curve. The validity of the model is preliminarily verified, which lays a foundation for studying the constitutive model of EPS concrete under complex loads.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU528

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