【摘要】：高強(qiáng)混凝土的高性能可以滿足橋梁工程中對(duì)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(jì)合理性對(duì)于橋梁發(fā)展現(xiàn)狀來(lái)說(shuō)尤為重要。本文針對(duì)C70高強(qiáng)混凝土小箱梁的抗彎性能問(wèn)題,對(duì)足尺C70高強(qiáng)預(yù)應(yīng)力混凝土簡(jiǎn)支梁進(jìn)行了試驗(yàn)探究,對(duì)梁體的受彎破壞形式、承載能力及抗彎性能進(jìn)行分析。文章試驗(yàn)部分對(duì)C70強(qiáng)度等級(jí)的混凝土小箱梁進(jìn)行了抗彎性能的加載試驗(yàn),并同C50強(qiáng)度等級(jí)的試驗(yàn)梁進(jìn)行抗彎性能的分析對(duì)比,對(duì)試驗(yàn)梁進(jìn)行了分析計(jì)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(duì)高強(qiáng)混凝土在國(guó)內(nèi)外的應(yīng)用現(xiàn)狀以及在應(yīng)用中出現(xiàn)的問(wèn)題進(jìn)行了概述,并提出了本文的研究意義和研究背景,對(duì)研究目標(biāo)和內(nèi)容進(jìn)行了總結(jié);2)第二部分提出并研究了試驗(yàn)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(jì)算等;對(duì)材料試驗(yàn)進(jìn)行了概述和結(jié)果匯總,得出了試驗(yàn)梁所用各種材料的力學(xué)參數(shù);3)第三部分對(duì)足尺梁加載試驗(yàn)進(jìn)行了概述,并對(duì)各片梁的設(shè)計(jì)參數(shù)、理論計(jì)算值、試驗(yàn)梁測(cè)點(diǎn)布置和加載方式進(jìn)行了分析匯總;4)第四部分以橋梁工程中常用的C50強(qiáng)度的預(yù)應(yīng)力混凝土小箱梁作為對(duì)照,對(duì)C70試驗(yàn)梁加載試驗(yàn)中的兩個(gè)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(xué)行為進(jìn)行了分析對(duì)比,并對(duì)C70試驗(yàn)梁的抗彎性能表現(xiàn)進(jìn)行了評(píng)估;5)第五部分對(duì)不同預(yù)應(yīng)力設(shè)置的C70強(qiáng)度預(yù)應(yīng)力混凝土小箱梁在抗彎性能及梁體力學(xué)表現(xiàn)上的影響進(jìn)行了探討,分析了截面應(yīng)變分布情況,對(duì)梁的延性及加載試驗(yàn)過(guò)程中的裂縫分布及發(fā)展情況進(jìn)行了分析探討,并進(jìn)行了部分預(yù)應(yīng)力和全預(yù)應(yīng)力混凝土小箱梁在抗彎性能表現(xiàn)上作出評(píng)估。本文以研究C70預(yù)應(yīng)力混凝土小箱梁的抗彎性能為目標(biāo),在進(jìn)行足尺梁加載試驗(yàn)的基礎(chǔ)上,文章對(duì)C70預(yù)應(yīng)力混凝土小箱梁正常使用狀態(tài)的安全儲(chǔ)備以及極限承載能力等抗彎性能進(jìn)行了分析,并對(duì)加載試驗(yàn)中梁體的力學(xué)行為表現(xiàn)進(jìn)行了分析對(duì)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(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U441

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本文編號(hào)：2219696