高強混凝土和頁巖陶粒混凝土的三軸受壓破壞準(zhǔn)則
本文選題:全輕頁巖陶粒混凝土 + 高強混凝土 ; 參考:《河南理工大學(xué)》2014年碩士論文
【摘要】:近年來,隨著社會發(fā)展和特種結(jié)構(gòu)的需求,對混凝土應(yīng)用提出了更高的要求,輕質(zhì)、高強、高性能混凝土已經(jīng)成為2020年中國科技發(fā)展目標(biāo)實施綱要之一。其中,全輕頁巖陶粒混凝土和高強、高性能混凝土作已經(jīng)在部分工程得到了應(yīng)用。由于混凝土結(jié)構(gòu)大多處于復(fù)雜應(yīng)力狀態(tài)下工作,若僅以單軸力學(xué)性能進(jìn)行設(shè)計,已經(jīng)不能滿足工程實際需要,尤其是對于像核電站安全殼、海洋采油平臺等特種結(jié)構(gòu)。因此,本文主要開展了全輕頁巖陶;炷梁透邚娀炷恋娜S受壓力學(xué)性能研究工作。利用大連理工大學(xué)的大型靜、動真三軸試驗機,分別對強度等級為LC30、LC40、LC50的全輕頁巖陶粒混凝土和C70、C80、C90的高強混凝土,以及其相應(yīng)的鋼纖維維混凝土,進(jìn)行了等比例三軸受壓試驗。試驗中,觀察并分析了試件的破壞形態(tài),并以柱狀破壞、層狀破壞、劈裂破壞和斜剪破壞為四種典型破壞特征,而全輕頁巖陶粒混凝土則還有擠壓流塑破壞特征;測得了試件的三軸受壓極限強度、塑性應(yīng)變、峰值應(yīng)變、總應(yīng)變以及應(yīng)力-應(yīng)變曲線。結(jié)果表明,全輕頁巖陶;炷梁透邚娀炷猎谌S受壓狀態(tài)下,強度和變形較單軸受壓有顯著增大,并且全輕頁巖陶;炷涟殡S有明顯的平臺流塑現(xiàn)象。因此,全輕頁巖陶粒混凝土在工程設(shè)計中將應(yīng)力平臺流塑段強度及其對應(yīng)的塑性應(yīng)變作為輕骨料混凝土的設(shè)計強度和設(shè)計應(yīng)變。此外,分析了中間主應(yīng)力對不同強度等級的全輕頁巖陶粒混凝土和高強混凝土的三軸壓強度和變形的影響,探索了不同混凝土種類和強度等級對三軸受壓強度和變形的影響,并通過三軸強度模型對極限應(yīng)力進(jìn)行了預(yù)測,其相對誤差的絕對值均小于7%,說明試驗結(jié)果是準(zhǔn)確、可靠的。最后,基于八面體應(yīng)力-應(yīng)變空間,分別對不同強度等級的全輕頁巖陶;炷梁透邚娀炷,分別建立了其相應(yīng)的破壞準(zhǔn)則和本構(gòu)關(guān)系。其中,全輕頁巖陶;炷恋睦鹤游缇與靜水壓力軸在高壓應(yīng)力區(qū)有交叉點,其破壞曲面是閉口的;而高強混凝土的拉、壓子午線與靜水壓力軸在高壓應(yīng)力區(qū)無交叉點,其破壞曲面是開口的。
[Abstract]:In recent years, with the development of society and the demand of special structure, the application of concrete has put forward higher requirements, light weight, high strength, high performance concrete has become one of the implementation outline of China's science and technology development goal in 2020. Among them, full-light shale ceramsite concrete and high-strength and high-performance concrete have been used in some projects. As most concrete structures work under complex stress conditions, if only uniaxial mechanical properties are used to design them, they can no longer meet the practical engineering needs, especially for special structures such as nuclear power plant containment and offshore oil recovery platforms. Therefore, the study of triaxial compressive mechanical properties of full light shale ceramsite concrete and high strength concrete is mainly carried out in this paper. By using the large static and dynamic triaxial testing machine of Dalian University of Technology, the equal proportion triaxial compression tests were carried out on the full light shale ceramsite concrete with strength grade LC30, LC40 and LC50, and the high strength concrete of C70 C80C80 and C90, as well as its corresponding steel fiber reinforced concrete. In the experiment, the failure patterns of the specimens are observed and analyzed, and the four typical failure characteristics are columnar failure, layered failure, split failure and oblique shear failure, while all light shale ceramsite concrete has the characteristics of extrusion flow plastic failure. The ultimate strength, plastic strain, peak strain, total strain and stress-strain curve of the specimen were measured. The results show that the strength and deformation of full light shale ceramsite concrete and high strength concrete under triaxial compression are significantly higher than that of uniaxial compression. Therefore, the strength of flow plastic section of stress platform and its corresponding plastic strain are taken as the design strength and design strain of lightweight aggregate concrete in the engineering design of full light shale ceramsite concrete. In addition, the effect of intermediate principal stress on the triaxial compressive strength and deformation of full light shale ceramsite concrete and high strength concrete with different strength grades is analyzed, and the effects of different types and strength grades of concrete on triaxial compressive strength and deformation are explored. The ultimate stress is predicted by triaxial strength model, and the absolute value of relative error is less than 7, which shows that the test results are accurate and reliable. Finally, based on the octahedron stress-strain space, the corresponding failure criteria and constitutive relations of full light shale ceramsite concrete and high strength concrete with different strength grades are established respectively. Among them, the tensile, meridian and hydrostatic pressure axis of full light shale ceramsite concrete have intersection points in the high pressure stress region, and the failure surface is closed, while the tensile, meridian and hydrostatic pressure axis of high strength concrete have no intersection points in the high pressure stress region. The broken surface is open.
【學(xué)位授予單位】:河南理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TU528
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