【摘要】：人類第一次使用鋼纖維混凝土作為普通鋼筋混凝土的替代品可以追溯到上世紀(jì)六十年代。自那以后,研究人員和工程師對(duì)對(duì)這種新型復(fù)合材料進(jìn)行了大量深入的研究。在過去的幾十年里,各個(gè)行業(yè)對(duì)鋼纖維混凝土構(gòu)筑物的需求呈上升趨勢(shì),尤其是在地下建筑結(jié)構(gòu)領(lǐng)域,鋼纖維混凝土更受到工程人員的青睞。在隧道及立井襯砌管片中使用鋼纖維混凝土具有很多優(yōu)點(diǎn),諸如：提高管片力學(xué)性能,增強(qiáng)耐久性、耐火性以及抗疲勞能力等。另外,通過在襯砌管片中加入適量的鋼纖維,可以部分甚至全部移除原有管片設(shè)計(jì)所需要的普通鋼筋。 在進(jìn)行鋼纖維混凝土結(jié)構(gòu)構(gòu)件的設(shè)計(jì)時(shí),有兩個(gè)很重要的問題必須提及。首先,設(shè)計(jì)者必須先根據(jù)相關(guān)規(guī)范制作試件進(jìn)行相應(yīng)的實(shí)驗(yàn)測(cè)試,但這些測(cè)試往往因?yàn)楹芨叩碾x散結(jié)果而不盡如人意；其次,對(duì)于隨著鋼纖維在不同種類混凝土中的單位含量的增加,其利用效率的研究也還基本處于空白階段。 本論文將試圖通過對(duì)普通鋼纖維混凝土以及自密實(shí)鋼纖維混凝土試件進(jìn)行抗壓測(cè)試,三點(diǎn)彎曲測(cè)試,巴塞羅那測(cè)試,多軸抗壓測(cè)試以及電感應(yīng)測(cè)試等一套完整的試驗(yàn)測(cè)試及數(shù)據(jù)分析來解決以上兩個(gè)問題。在制備普通鋼纖維混凝土及自密實(shí)鋼纖維混凝土試件時(shí),分別添加了單位體積為30、45和60千克每立方米的鋼纖維。 通過三點(diǎn)彎曲測(cè)試,單位體積鋼纖維的含量和變異系數(shù)之間的關(guān)系可以得到很好的確定。此外,鋼纖維利用效率與纖維含量之間的顯著關(guān)系也可以通過在普通鋼纖維混凝土及自密實(shí)鋼纖維混凝土各自提升50%和100%來明確體現(xiàn)。盡管導(dǎo)致混凝土材料使用效率的原因是復(fù)雜多變的,但通過不同的測(cè)試結(jié)果歸納起來主要有以下三個(gè)：纖維分布及傾向特定方向優(yōu)先原則,特定情況下出現(xiàn)纖維球以及不同混凝土拌合物的粘度差異。 通過對(duì)巴塞羅那Sabadell隧道使用纖維利用率優(yōu)化案來看,管片不僅可以完全不用使用鋼筋,而且還可以減小襯砌管片的厚度。對(duì)于普通鋼纖維混凝土襯砌管片,其厚度可以降低12%；而對(duì)于自密實(shí)鋼纖維混凝土來說,在保證其各種力學(xué)性能的情況下,其管片厚度則可以降低達(dá)40%。另外,在不考慮勞務(wù)費(fèi)節(jié)省的情況下,僅因管片厚度減小所帶來的直接經(jīng)濟(jì)效益,普通鋼纖維混凝土和自密實(shí)鋼纖維混凝土可以分別降低31.60%,和35.81%。
[Abstract]:The first use of steel fiber reinforced concrete as a substitute for ordinary reinforced concrete can be traced back to the 1960 s. Since then, researchers and engineers have done a lot of in-depth research on the new composite. In the past few decades, the demand for steel fiber reinforced concrete structures in various industries has shown an upward trend, especially in the field of underground building structures, steel fiber reinforced concrete is more favored by engineers. The use of steel fiber reinforced concrete in tunnel and shaft lining segments has many advantages, such as improving the mechanical properties of segments, enhancing durability, fire resistance and fatigue resistance. In addition, by adding proper amount of steel fiber to the lining segment, the ordinary steel bar needed for the original segment design can be removed partly or even completely. In the design of steel fiber reinforced concrete structural members, there are two very important problems that must be mentioned. First of all, the designer must first make the specimens according to the relevant specifications to carry out the corresponding experimental tests, but these tests are often not satisfactory because of the high discrete results. Secondly, with the increase of the unit content of steel fiber in different kinds of concrete, the study of its utilization efficiency is still in the blank stage. In this paper, we will try to test the compression, three-point bending and Barcelona test of ordinary steel fiber reinforced concrete and self-compacting steel fiber reinforced concrete specimens. A complete set of test tests and data analysis, such as multiaxial compression test and electric induction test, are used to solve the above two problems. In the preparation of ordinary steel fiber reinforced concrete and self-compacting steel fiber reinforced concrete specimens, 30, 45 kg and 60 kg steel fiber per cubic meter were added respectively. Through three-point bending test, the relationship between the content of steel fiber per unit volume and the coefficient of variation can be well determined. In addition, the significant relationship between the utilization efficiency of steel fiber and the fiber content can also be clearly reflected by increasing the utilization efficiency of steel fiber and self-compacting steel fiber reinforced concrete by 50% and 100% respectively. Although the reasons for the efficiency of concrete materials are complex and changeable, there are three main test results: fiber distribution and preference for specific directions. In specific cases, the viscosity of fiber ball and different concrete mixtures is different. Through the optimization of fiber utilization ratio in Barcelona Sabadell tunnel, the segment can not only use steel bar at all, but also reduce the thickness of lining segment. For ordinary steel fiber reinforced concrete lining segments, the thickness can be reduced by 12%, while for self-compacting steel fiber reinforced concrete, the thickness of segments can be reduced by 40% under the condition of ensuring all kinds of mechanical properties of steel fiber reinforced concrete. In addition, without considering the saving of labor expenses, ordinary steel fiber reinforced concrete and self-compacting steel fiber reinforced concrete can be reduced by 31.60% and 35.81% respectively because of the direct economic benefits caused by the decrease of segment thickness.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU528

【共引文獻(xiàn)】

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本文編號(hào)：2485736