【摘要】：高強混凝土的高性能可以滿足橋梁工程中對跨徑及承載能力等方面的要求,尤其是其表現(xiàn)出現(xiàn)出的高耐久性、良好的工作性、良好的體積穩(wěn)定性和經(jīng)濟合理性對于橋梁發(fā)展現(xiàn)狀來說尤為重要。本文針對C70高強混凝土小箱梁的抗彎性能問題,對足尺C70高強預應(yīng)力混凝土簡支梁進行了試驗探究,對梁體的受彎破壞形式、承載能力及抗彎性能進行分析。文章試驗部分對C70強度等級的混凝土小箱梁進行了抗彎性能的加載試驗,并同C50強度等級的試驗梁進行抗彎性能的分析對比,對試驗梁進行了分析計算和有限元模擬,本文主要內(nèi)容如下:1)文章的第一部分對高強混凝土在國內(nèi)外的應(yīng)用現(xiàn)狀以及在應(yīng)用中出現(xiàn)的問題進行了概述,并提出了本文的研究意義和研究背景,對研究目標和內(nèi)容進行了總結(jié);2)第二部分提出并研究了試驗相關(guān)的理論,主要包括使用材料性能、延性、非線性假定及裂縫寬度計算等;對材料試驗進行了概述和結(jié)果匯總,得出了試驗梁所用各種材料的力學參數(shù);3)第三部分對足尺梁加載試驗進行了概述,并對各片梁的設(shè)計參數(shù)、理論計算值、試驗梁測點布置和加載方式進行了分析匯總;4)第四部分以橋梁工程中常用的C50強度的預應(yīng)力混凝土小箱梁作為對照,對C70試驗梁加載試驗中的兩個主要工況(開裂工況和破壞工況)的應(yīng)變、延性和裂縫等力學行為進行了分析對比,并對C70試驗梁的抗彎性能表現(xiàn)進行了評估;5)第五部分對不同預應(yīng)力設(shè)置的C70強度預應(yīng)力混凝土小箱梁在抗彎性能及梁體力學表現(xiàn)上的影響進行了探討,分析了截面應(yīng)變分布情況,對梁的延性及加載試驗過程中的裂縫分布及發(fā)展情況進行了分析探討,并進行了部分預應(yīng)力和全預應(yīng)力混凝土小箱梁在抗彎性能表現(xiàn)上作出評估。本文以研究C70預應(yīng)力混凝土小箱梁的抗彎性能為目標,在進行足尺梁加載試驗的基礎(chǔ)上,文章對C70預應(yīng)力混凝土小箱梁正常使用狀態(tài)的安全儲備以及極限承載能力等抗彎性能進行了分析,并對加載試驗中梁體的力學行為表現(xiàn)進行了分析對比。
[Abstract]:The high performance of high strength concrete can meet the requirements of span and bearing capacity in bridge engineering, especially its high durability and good workability. Good volume stability and economic rationality are very important for bridge development. Aiming at the flexural behavior of C70 high strength concrete small box girder, this paper makes an experimental study on the full scale C 70 high strength prestressed concrete simply supported beam, and analyzes the bending failure mode, bearing capacity and flexural behavior of the beam body. In the experiment part, the flexural behavior of the concrete box girder with C70 strength grade is tested and compared with that of the test beam with C50 strength grade. The test beam is analyzed and calculated and simulated by finite element method. The main contents of this paper are as follows: (1) in the first part of the article, the application status and problems of HSC at home and abroad are summarized, and the research significance and background of this paper are put forward. In the second part, the author puts forward and studies the relevant theories of the test, including the use of material properties, ductility, nonlinear assumption and crack width calculation, and summarizes the material test and the results. The mechanical parameters of all kinds of materials used in the test beam are obtained. In the third part, the loading test of full-scale beam is summarized, and the design parameters of each beam are calculated theoretically. The layout and loading mode of test beams are analyzed and summarized. The fourth part is compared with the small prestressed concrete box girder with C50 strength, which is commonly used in bridge engineering. The mechanical behaviors of strain, ductility and crack in the loading test of C70 test beam under two main conditions (cracking and failure) are analyzed and compared. Finally, the flexural behavior of C70 test beam is evaluated. In the fifth part, the influence of different prestressed concrete box girder with different prestress on the flexural behavior and the mechanical behavior of the beam is discussed. The strain distribution of the section is analyzed, the ductility of the beam and the crack distribution and its development during the loading test are analyzed and discussed, and the flexural behavior of the partially prestressed and fully prestressed concrete small box girder is evaluated. In this paper, the flexural behavior of C70 prestressed concrete small box girder is studied. In this paper, the flexural behavior of C70 prestressed concrete small box girder under normal operation condition, such as safety reserve and ultimate bearing capacity, is analyzed, and the mechanical behavior of the beam in loading test is analyzed and compared.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U441

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本文編號：2219696