本文選題：簡(jiǎn)支轉(zhuǎn)連續(xù)　切入點(diǎn)：預(yù)應(yīng)力鋼筋　出處：《東北林業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：在我國(guó)橋梁建設(shè)過程中,預(yù)應(yīng)力混凝土簡(jiǎn)支轉(zhuǎn)連續(xù)T梁橋以其受力與施工方面的諸多優(yōu)點(diǎn)被大量的采用。該種橋型采用預(yù)應(yīng)力技術(shù),對(duì)提高橋梁的跨越能力以及使用性能起到很大作用。預(yù)應(yīng)力技術(shù)采用高強(qiáng)材料,可有效的減小構(gòu)件中鋼材與混凝土的工程用量,降低工程造價(jià),同時(shí)可改善混凝土構(gòu)件的使用性能。預(yù)應(yīng)力結(jié)構(gòu)中預(yù)應(yīng)力鋼筋是其關(guān)鍵的受力構(gòu)件,預(yù)應(yīng)力筋的應(yīng)力分布及其變化直接影響橋梁結(jié)構(gòu)承載力、剛度的變化。因此,鑒于其重要性,對(duì)該種橋型主梁預(yù)應(yīng)力筋應(yīng)力變化進(jìn)行研究。本文以三跨預(yù)應(yīng)力混凝土簡(jiǎn)支轉(zhuǎn)連續(xù)T梁橋—寶貝河大橋?yàn)橐劳?對(duì)試驗(yàn)梁各施工階段預(yù)應(yīng)力鋼筋應(yīng)力值進(jìn)行測(cè)試。使用Midas/Civil有限元軟件建立試驗(yàn)橋有限元模型,計(jì)算各施工階段測(cè)點(diǎn)位置預(yù)應(yīng)力鋼筋的理論應(yīng)力值,通過對(duì)實(shí)測(cè)數(shù)據(jù)與理論計(jì)算數(shù)據(jù)對(duì)比分析,驗(yàn)證有限元模型的正確性。根據(jù)試驗(yàn)橋梁有限元模型的計(jì)算結(jié)果,對(duì)各個(gè)施工階段預(yù)應(yīng)力鋼筋的應(yīng)力分布進(jìn)行分析,并對(duì)應(yīng)力增量進(jìn)行討論,得出不同的施工階段對(duì)預(yù)應(yīng)力鋼筋應(yīng)力增量的影響。橋梁使用階段,在不同車道布載情況下,對(duì)縱橋向各截面預(yù)應(yīng)力鋼筋應(yīng)力增量進(jìn)行討論,還對(duì)同跨各T梁不同截面預(yù)應(yīng)力筋應(yīng)力增量進(jìn)行分析,得出偏載時(shí),偏載側(cè)邊梁預(yù)應(yīng)力筋應(yīng)力增量最大,中載時(shí)3#梁預(yù)應(yīng)力筋應(yīng)力增量最大。
[Abstract]:In the process of bridge construction in China, prestressed concrete simply supported continuous T-beam bridge is widely used for its advantages in force and construction. It plays a great role in improving the span capacity and performance of bridges. The use of high-strength materials in prestressing technology can effectively reduce the engineering consumption of steel and concrete in the members and reduce the project cost. At the same time, the performance of concrete members can be improved. In prestressed structure, prestressed steel bar is the key member. The stress distribution and its change of prestressed tendons directly influence the change of bearing capacity and stiffness of bridge structure. In view of its importance, the stress change of prestressed tendons of this kind of main girder is studied. The stress value of prestressed steel bar in each construction stage of test beam is tested. The finite element model of test bridge is established by using Midas/Civil finite element software, and the theoretical stress value of prestressed steel bar at each construction stage is calculated. The validity of the finite element model is verified by comparing the measured data with the theoretical calculation data. According to the calculation results of the finite element model of the test bridge, the stress distribution of the prestressed steel bar in each construction stage is analyzed. The influence of different construction stages on the stress increment of prestressed steel bar is obtained. In the use of bridge, the stress increment of prestressed steel bar in different sections of longitudinal bridge is discussed in the case of different driveway distribution. The stress increment of prestressed tendons in different sections of T-beams with the same span is also analyzed. The results show that the stress increment of prestressed tendons is the largest in the lateral beams under eccentric loads and the largest in the beams at mid-load.
【學(xué)位授予單位】：東北林業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U448.212

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本文編號(hào)：1567421