本文選題：高延性纖維增強(qiáng)水泥基復(fù)合材料 + 準(zhǔn)應(yīng)變硬化　； 參考：《蘭州理工大學(xué)》2013年碩士論文

【摘要】：混凝土材料是目前世界上應(yīng)用最廣泛、用量最大的建筑材料,雖然混凝土材料具有許多優(yōu)異性能,但是也存在著脆性大、易開裂和抗拉強(qiáng)度低等缺點(diǎn),使用于實(shí)際工程中往往會(huì)導(dǎo)致結(jié)構(gòu)的破壞,影響建筑物的正常使用。在混凝土中摻加纖維有利于克服上述缺點(diǎn),提高混凝土的抗彎強(qiáng)度、抗拉性能、抗剪強(qiáng)度,增強(qiáng)混凝土的抗沖擊性、韌性、延展性,改善混凝土的抗?jié)B性、耐磨損性以及抗裂性,提高混凝土的耐久性,從而達(dá)到提高建筑物的質(zhì)量和使用壽命的目的。 高延性纖維增強(qiáng)水泥基復(fù)合材料(Engineering Cementitious Composites,簡(jiǎn)稱ECC),屬于新型高性能纖維混凝土材料,其在直接拉伸作用及彎曲作用下均表現(xiàn)出多縫開裂和準(zhǔn)應(yīng)變硬化的典型特征,其極限拉伸應(yīng)變能穩(wěn)定地達(dá)到3%以上,裂縫寬度保持在100μm左右。它以高延性和優(yōu)異的耐久性漸漸被人們重視,在實(shí)際工程中具有廣泛的應(yīng)用前景。美國(guó)、歐洲及日本等發(fā)達(dá)國(guó)家已將ECC應(yīng)用到實(shí)際工程中,而且取得了很好的應(yīng)用效果,但是在國(guó)內(nèi),關(guān)于ECC的研究才開始不久。本論文根據(jù)國(guó)內(nèi)外ECC的科研結(jié)果,用聚乙烯醇(Polyvinyl Alcohol,簡(jiǎn)稱PVA)纖維作為ECC的增韌材料,對(duì)PVA-ECC進(jìn)行了工作性能、抗彎性能、抗壓性能試驗(yàn),在此基礎(chǔ)上對(duì)PVA-ECC梁柱節(jié)點(diǎn)進(jìn)行了數(shù)值模擬,主要工作有以下幾個(gè)方面： 1.對(duì)PVA-ECC拌合物進(jìn)行了工作性能研究,并對(duì)PVA-ECC棱柱體試件進(jìn)行了抗折試驗(yàn),利用抗壓試驗(yàn)研究PVA-ECC棱柱體試件和立方體試件的抗壓性能,觀察其破壞形態(tài)。 2.利用四點(diǎn)彎曲試驗(yàn)研究PVA-ECC梁、板試件的彎曲性能,觀察PVA-ECC試件受彎時(shí)的準(zhǔn)應(yīng)變-硬化及裂縫開裂形態(tài)的特征,通過試驗(yàn)結(jié)果,評(píng)價(jià)PVA-ECC梁、板試件的抗彎性能,計(jì)算構(gòu)件的彎曲韌性指標(biāo)。 3.利用ABAQUS軟件進(jìn)行模擬,分析了PVA-ECC高延性對(duì)梁柱節(jié)點(diǎn)受彎試件在水平往復(fù)荷載作用下滯回性能的影響；并與普通混凝土梁柱節(jié)點(diǎn)受彎試件進(jìn)行了比較,分析了兩者之間變形能力、剛度退化及耗能的不同。
[Abstract]:Concrete materials are the most widely used and used building materials in the world at present. Although concrete materials have many excellent properties, they also have some shortcomings such as high brittleness, easy cracking and low tensile strength. Use in practical engineering will often lead to structural damage, affecting the normal use of buildings. Adding fiber to concrete can overcome the above disadvantages, improve the flexural strength, tensile strength, shear strength, impact resistance, toughness and ductility of concrete, and improve the impermeability of concrete. The wear resistance and crack resistance of concrete can improve the durability of concrete so as to improve the quality and service life of buildings. Engineering Cementitious composites (Ecce), a new type of high performance fiber reinforced concrete material, shows typical characteristics of multi-joint cracking and quasi-strain hardening under direct tensile and bending action. The ultimate tensile strain is over 3% and the crack width is about 100 渭 m. Because of its high ductility and excellent durability, it has been paid more and more attention, and has a wide application prospect in practical engineering. Developed countries such as America, Europe and Japan have applied ECC to practical projects, and achieved good results. But in China, the research on ECC has only begun soon. In this paper, based on the research results of ECC at home and abroad, polyvinyl alcohol Alcohol (PVA) fiber was used as toughening material of ECC, and the performance, bending and compressive properties of PVA-ECC were tested. On the basis of the experiments, the joint of PVA-ECC Liang Zhu was numerically simulated. The main tasks are as follows: 1. The working performance of PVA-ECC mixture was studied, and the flexural test of PVA-ECC prism specimen was carried out. The compressive properties of PVA-ECC prism specimen and cube specimen were studied by compression test, and the failure mode was observed. 2. The flexural properties of PVA-ECC beams and plate specimens were studied by four-point bending test. The characteristics of quasi-strain-hardening and crack cracking of PVA-ECC specimens were observed. The flexural properties of PVA-ECC beams and plate specimens were evaluated by the test results. The flexural toughness index is calculated. 3. The influence of high ductility of PVA-ECC on the hysteretic behavior of Liang Zhu joints under horizontal reciprocating load is analyzed by using ABAQUS software, and the deformation capacity of Liang Zhu joints under horizontal reciprocating load is analyzed by comparing with the flexural specimens of ordinary concrete Liang Zhu joints. Stiffness degradation and energy dissipation are different.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU528.572

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 蘇駿;徐世p，

本文編號(hào)：1849358