本文關(guān)鍵詞： 體外預(yù)應(yīng)力加固 簡支T梁 工程實踐 有限元模擬　出處：《武漢工程大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：中小跨徑橋梁是公路交通路網(wǎng)的重要組成部分,這些橋很多都年代久遠,由于環(huán)境、設(shè)計、施工及維修等方面的原因,出現(xiàn)了不同程度的破壞,保證它們的安全性能具有重要的經(jīng)濟意義和社會意義。體外預(yù)應(yīng)力屬于一種主動加固的范疇,對原結(jié)構(gòu)損害程度低,且能很大程度上提高結(jié)構(gòu)承載能力,有效控制結(jié)構(gòu)跨中撓度及截面裂縫,進而在工程中得到廣泛應(yīng)用。本文以跨徑、混凝土等級、預(yù)應(yīng)力筋(束)的截面面積、預(yù)應(yīng)力筋(束)錨固點和轉(zhuǎn)向點為變量,對普通鋼筋混凝土簡支T型梁橋采用折線形體外預(yù)應(yīng)力加固后的承載能力、梁跨中豎向永久變形和梁跨中混凝土法向正應(yīng)力進行理論分析和有限元模擬分析。理論結(jié)果表明:體外預(yù)應(yīng)力加固能很大程度提高原梁體的抗彎承載力,提高程度隨預(yù)應(yīng)力筋(束)面積的增加基本呈線性增長;抗剪承載力與預(yù)應(yīng)力筋(束)的布置情況有關(guān);跨中撓度和截面應(yīng)力都能有所改善且都控制在規(guī)范限制范圍內(nèi)。有限元建模分析結(jié)果與理論計算結(jié)果基本一致。通過兩種方法對比分析,得出用有限元建模分析可以簡化計算且結(jié)果無較大差異,今后可多應(yīng)用在體外預(yù)應(yīng)力加固驗算中。本文得出的結(jié)論,為進一步推廣體外預(yù)應(yīng)力加固技術(shù),及其在中小跨徑的低等級普通鋼筋混凝土T型梁橋加固中的應(yīng)用提供參考和依據(jù)。
[Abstract]:Medium and small span bridges are an important part of highway traffic network. Many of these bridges are old, due to the environment, design, construction and maintenance and other reasons, there have been varying degrees of damage. It is of great economic and social significance to ensure their safety performance. External prestressing belongs to the category of active reinforcement, which has low damage to the original structure and can improve the bearing capacity of the structure to a great extent. Effective control of the mid-span deflection and cross-section cracks, and then widely used in engineering. This paper based on the span, concrete grade, the section area of prestressed tendons (bundles). The anchoring point and turning point of prestressed tendons (bundles) are variables, and the load-carrying capacity of T-beam bridges with simply supported reinforced concrete is strengthened by prestressed concrete. The vertical permanent deformation of beam span and the normal normal stress of concrete in beam span are analyzed theoretically and simulated by finite element method. The theoretical results show that the external prestressed reinforcement can greatly improve the flexural bearing capacity of the original beam. The degree of improvement increases linearly with the increase of the area of prestressed tendons (bundles). The shear bearing capacity is related to the arrangement of prestressed tendons (bundles); The mid-span deflection and cross-section stress can be improved and controlled within the limit range of the code. The results of finite element modeling and theoretical calculation are basically consistent. The results are compared and analyzed by two methods. It is concluded that the finite element modeling and analysis can simplify the calculation and there is no significant difference in the results. In the future, it can be used in the external prestressing reinforcement checking calculation. The conclusion of this paper is to further promote the external prestressing reinforcement technology. And its application in the reinforcement of low grade ordinary reinforced concrete T-beam bridge with medium and small span provides reference and basis.
【學(xué)位授予單位】：武漢工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U445.72

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