钢筋混凝土T梁体外预应力加固研究

发布时间：2018-04-05 00:19

本文选题：桥梁加固　切入点：体外预应力　出处：《东北林业大学》2015年硕士论文

【摘要】：体外预应力加固作为主动加固方法的一个重要组成部分,现今越来越多的被应用于各项加固工程当中,尤其是对一些旧钢筋混凝土桥梁的加固,体外预应力起到了良好的加固效果。体外预应力相比于其他加固方法,有着整体性好、不存在应力滞后、加固效果良好、施工不影响交通等优点。我国体外预应力加固技术的研究相较于国外起步较晚,致使体外预应力技术在国内的发展还存在很大的空间,因此需要在体外预应力加固理论及实践方面进行进一步的研究,以推动体外预应力加固技术在我国的发展。本文依托盘古大桥体外预应力加固工程,对钢筋混凝土T型梁桥的体外预应力加固技术进行了研究,结合实际工程,分析了钢筋混凝土T型梁桥容易产生的病害及其原因,并通过理论计算进行验证；对体外预应力加固计算理论进行了研究,并以此为基础确定了体外预应力加固方案；根据体外预应力计算理论对加固后的结构进行了验算,验证加固方案的合理性,并采用Midas FEA建立有限元模型,对锚固装置受力分析,验证其安全性；通过体外预应力加固过程监控,保证施工安全及体外预应力张拉效果,通过成桥荷载试验来验证加固效果。通过研究本文得出结论：体外预应力加固可以有效提高钢筋混凝土T梁的刚度、强度,并能有效抑制裂缝的发展,提高原桥性能,对旧桥加固起到了一定的参考价值。
[Abstract]:As an important part of the active reinforcement method of external prestressing reinforcement, and more and more are used in the reinforcement engineering, especially the reinforcement of some old reinforced concrete bridge, prestressed has good reinforcement effect. Compared to other external prestressed reinforcement method has good integrity, does not exist stress lag, reinforcement effect is good, the construction does not affect the traffic and other advantages. Research on reinforcement technology of external prestressing in China compared with foreign countries started late, resulting in the development of external prestressing technology in China has very large space, therefore need to strengthen the theory and practice of in vitro prestressed areas for further study, in order to promote external prestressed reinforcement technology development in China. Based on the bridge Pangu external prestressed reinforcement engineering technology of external prestressed reinforcement for reinforced concrete T beam bridge Operation is studied, combined with the actual project, analyzes the damage causes and reinforced concrete T beam bridge, and verified by theoretical calculation; the external prestress reinforcement calculation theory are studied, and on this basis to determine the party external prestressed reinforcement case; according to the calculation theory of external prestressed checking for structural reinforcement after the rationality verification of reinforcement scheme, and using Midas FEA to build the finite element model for stress analysis of anchorage device, verify its safety; strengthening process monitoring by external prestressing, ensure the construction safety and external prestressing effect, the bridge load test to verify the reinforcement effect. This paper draws the conclusion: can effectively improve the reinforced concrete T beam stiffness, external prestressing strength, and can effectively inhibit the development of cracks, improve the performance of the original bridge, the old bridge and It has been fixed to a certain reference value.

【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.72

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