本文關(guān)鍵詞： 體外預(yù)應(yīng)力 混凝土梁 全過(guò)程分析 受彎性能 延性 應(yīng)力增量　出處：《北京交通大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：體外預(yù)應(yīng)力加固是一種主動(dòng)的加固方式,能夠顯著提高結(jié)構(gòu)的承載力。由于具備施工快捷、維護(hù)管理方便、自重輕等優(yōu)點(diǎn),體外預(yù)應(yīng)力技術(shù)被廣泛應(yīng)用于橋梁的新建和加固。本文基于6根體外預(yù)應(yīng)力加固混凝土梁的試驗(yàn)對(duì)體外預(yù)應(yīng)力梁的受力性能展開相關(guān)研究。本文的研究工作主要包括以下四個(gè)部分：第一,對(duì)3根體外預(yù)應(yīng)力加固混凝土T梁和3根體外預(yù)應(yīng)力加固混凝土箱梁進(jìn)行全過(guò)程加載試驗(yàn),通過(guò)分析試驗(yàn)梁的應(yīng)變、撓度、裂縫發(fā)展等試驗(yàn)數(shù)據(jù)和現(xiàn)象,研究了不同加固方式和不同的體外預(yù)應(yīng)力筋有效高度對(duì)梁加固效果和受力行為的影響。通過(guò)試驗(yàn)發(fā)現(xiàn),設(shè)置體外預(yù)應(yīng)力筋的試驗(yàn)梁抗彎承載力提高了50%以上,卸載加固可以使原有裂縫完全閉合,而帶載加固時(shí)原有寬度較大的裂縫的寬度減小,原有寬度較小的裂縫閉合。增大體外預(yù)應(yīng)力筋的有效高度可以提高梁的抗彎承載力。第二,通過(guò)合理簡(jiǎn)化計(jì)算模型,以彎矩-曲率分析為基礎(chǔ),結(jié)合共軛梁法,建立體外預(yù)應(yīng)力混凝土梁彎曲性能的全過(guò)程分析方法,并利用Matlab編制了計(jì)算程序。通過(guò)試驗(yàn)值與計(jì)算值的比較,證明本文所建立的全過(guò)程分析方法的計(jì)算精度較高。在此基礎(chǔ)上,對(duì)跨高比、混凝土強(qiáng)度、普通鋼筋及預(yù)應(yīng)力筋等參數(shù)對(duì)梁受彎性能的影響進(jìn)行具體分析。第三,以位移延性系數(shù)為指標(biāo),分析了試驗(yàn)梁的延性特征,并對(duì)混凝土強(qiáng)度、受壓區(qū)普通鋼筋指標(biāo)、受拉區(qū)普通鋼筋指標(biāo)、部分預(yù)應(yīng)力比率、體外預(yù)應(yīng)力筋有效高度等幾個(gè)影響梁延性的因素做了參數(shù)分析。通過(guò)研究發(fā)現(xiàn),與未加固梁相比,加固梁的位移延性系數(shù)減小,帶載加固和卸載加固對(duì)梁最終的延性損失影響較小,增大體外預(yù)應(yīng)力筋的有效高度可以在減小延性損失的情況下顯著提高梁的抗彎承載能力。第四,研究了體外預(yù)應(yīng)力筋在加載過(guò)程中的應(yīng)力變化情況,以及體外筋對(duì)體內(nèi)筋應(yīng)力的影響,并建議了加固設(shè)計(jì)時(shí)預(yù)應(yīng)力筋極限應(yīng)力的計(jì)算公式。針對(duì)公路橋梁體外預(yù)應(yīng)力加固,推導(dǎo)了加固時(shí)所需的體外預(yù)應(yīng)力筋用量的上限值。在此基礎(chǔ)上,分析了跨高比、混凝土強(qiáng)度等因素對(duì)預(yù)應(yīng)力筋應(yīng)力增量的影響。本文的研究成果有助于加深對(duì)體外預(yù)應(yīng)力混凝土結(jié)構(gòu)的理解,也為體外預(yù)應(yīng)力混凝土橋梁的新建和加固設(shè)計(jì)提供了技術(shù)支持。
[Abstract]:External prestressed reinforcement is an active reinforcement method, which can significantly improve the bearing capacity of the structure. Because of the advantages of quick construction, convenient maintenance and management, light weight and so on. External prestressing technology is widely used in the construction and reinforcement of bridges. Based on the experimental results of 6 externally prestressed concrete beams, the mechanical behavior of externally prestressed beams is studied in this paper. The main work of this paper is to study the behavior of externally prestressed concrete beams. It consists of the following four parts:. Number one. Three concrete T-beams strengthened by external prestressing and three concrete box girders strengthened by external prestressing were tested in the whole process, and the experimental data and phenomena of strain, deflection and crack development of the test beams were analyzed. The effects of different reinforcement methods and different effective heights of external prestressed tendons on the strengthening effect and mechanical behavior of beams are studied. The flexural bearing capacity of the test beam with external prestressed tendons is increased by more than 50%, and the original crack can be completely closed by unloading and strengthening, while the width of the crack with the larger width is reduced when the load is strengthened. The original crack closure with small width. Increasing the effective height of external prestressed tendons can improve the flexural capacity of beams. Second, through reasonable simplification of the calculation model, based on the moment curvature analysis, combined with conjugate beam method. The whole process analysis method of the bending behavior of externally prestressed concrete beams is established, and the calculation program is compiled by using Matlab. The comparison between the experimental values and the calculated values is carried out. It is proved that the calculation accuracy of the whole process analysis method established in this paper is high. On this basis, the ratio of span to height, the concrete strength is obtained. The influence of the parameters such as common reinforcement and prestressed tendons on the flexural behavior of the beam is analyzed in detail. Thirdly, the ductility characteristics of the test beam are analyzed with the displacement ductility coefficient as the index, and the concrete strength is analyzed. Several factors affecting the ductility of beam are analyzed, such as the index of common steel bar in compression zone, the index of ordinary steel bar in tension area, the ratio of partial prestressing force and the effective height of external prestressing tendons. Compared with the unstrengthened beam, the displacement ductility coefficient of the strengthened beam decreases, and the ultimate ductility loss of the beam is less affected by the consolidation with load and the unloading reinforcement. Increasing the effective height of external prestressed tendons can significantly improve the flexural bearing capacity of beams under the condition of reducing ductility loss. 4th. The stress changes of external prestressed tendons during loading are studied. The influence of external tendons on the stress of internal tendons and the calculation formula of ultimate stress of prestressed tendons in reinforcement design are suggested. The upper limit of the amount of external prestressing tendons needed for reinforcement is deduced. Based on this, the ratio of span to height is analyzed. The effect of concrete strength and other factors on stress increment of prestressed tendons. The research results in this paper are helpful to deepen the understanding of external prestressed concrete structures. It also provides technical support for the construction and reinforcement design of externally prestressed concrete bridges.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U446;U445.72

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