本文關(guān)鍵詞： 鋼筋混凝土梁 抗剪加固 粘貼鋼板 粘貼碳纖維 有限元分析　出處：《河北工業(yè)大學》2015年碩士論文　論文類型：學位論文

【摘要】：混凝土梁橋在運營較長時間后,會出現(xiàn)混凝土開裂等破損現(xiàn)象,引起結(jié)構(gòu)承載力不足。對橋梁進行加固改造,可以恢復(fù)甚至提高原有鋼筋混凝土橋梁的承載能力,延長使用壽命。本文分析了鋼筋混凝土梁和鋼板、碳纖維加固梁的斜截面抗剪承載力影響因素。通過對加固前試驗梁、粘貼鋼板和碳纖維布加固梁的3組梁進行靜載試驗,研究了在加固梁中各材料的抗剪受力特性,得出了粘貼鋼板、碳纖維布抗剪承載力以及對混凝土梁剛度的提高值,推導(dǎo)了混凝土側(cè)面矩形粘貼加固材料抗剪承載力的簡化計算公式。運用有限元分析軟件,根據(jù)混凝土的本構(gòu)關(guān)系,建立計算模型,對3組梁分別進行了有限元模擬,所得變形、應(yīng)力計算結(jié)果與試驗值吻合。以混凝土梁橋?qū)嶋H加固工程為背景,從力學性能、經(jīng)濟性以及施工工藝出發(fā),對粘貼鋼板與碳纖維布加固進行了對比分析,論述了兩種加固方法各自的適用條件及優(yōu)點。通過對實際加固工程的設(shè)計計算及實橋的荷載試驗,驗證了粘貼鋼板加固在實際中的應(yīng)用的可靠性。本文的研究成果對混凝土橋梁的抗剪加固有一定的理論意義和實用價值。
[Abstract]:After a long period of operation, the concrete beam bridge will be damaged, such as concrete cracking, which will lead to the insufficient bearing capacity of the structure. Strengthening and reforming the bridge can restore or even improve the bearing capacity of the original reinforced concrete bridge. In this paper, the influence factors of shear bearing capacity of reinforced concrete beam, steel plate and carbon fiber reinforced beam are analyzed. The static load tests of three groups of beams with steel plate and carbon fiber sheet are carried out before reinforcement, as well as with steel plate and carbon fiber sheet. In this paper, the shear behavior of various materials in the strengthened beam is studied, and the shear bearing capacity of the bonded steel plate, carbon fiber sheet and the stiffness of the concrete beam are obtained. A simplified formula for calculating the shear capacity of concrete reinforced material with rectangular paste on the side is derived. The finite element analysis software is used to establish the calculation model according to the constitutive relation of concrete, and the three groups of beams are simulated by finite element method, and the resulting deformation is obtained. The results of stress calculation are in agreement with the experimental results. Based on the actual reinforcement project of concrete beam bridge, the paper makes a comparative analysis on the reinforcement of steel plate and carbon fiber sheet in terms of mechanical properties, economy and construction technology. This paper discusses the applicable conditions and advantages of the two reinforcement methods, through the design and calculation of the actual reinforcement project and the load test of the real bridge, The results of this paper have certain theoretical significance and practical value for shear strengthening of concrete bridges.
【學位授予單位】：河北工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U446;U445.72

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相關(guān)期刊論文 前1條

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本文編號：1512568