预应力碳纤维板加固受损预应力混凝土空心板梁试验研究

发布时间：2018-04-21 12:43

本文选题：预应力碳纤维板 + 平板锚具　；参考：《华北水利水电大学》2017年硕士论文

【摘要】：预应力技术是20世纪混凝土结构工程领域最具有革命性的结构构思,已广泛用于土木建筑工程。针对桥梁带载加固后加补强材料应变(应力)滞后这一缺点,对碳纤维板先施加预应力然后对桥梁进行加固,可有效提高材料的利用价值,预应力碳纤维板加固技术有望从根本上解决了后加补强材料应变(应力)滞后问题。为了研发一个可靠、永久的预应力碳纤维板锚固系统和简捷、有效的张拉系统,并成功的应用于实际桥梁加固工程,论文主要进行了预应力碳纤维板加固用新型锚具研发与加固效果试验验证,主要研究内容与成果如下:(1)针对传统采用万能试验机加载测定锚具锚固性能的不足之处,本文以实验室长10m的钢箱梁作为张拉台座,开发了一套足尺张拉、锚固预应力碳纤维板锚固性能试验装置;(2)针对传统传统预应力碳纤维板平板锚具锚固性能不足的问题,研发一种带圆齿纹粗糙面的新型平板锚具,具有机械性能好、锚固性能高等优点;(3)对传统的碳纤维板平板锚具的施工张拉方式进行改进,弃用张拉丝杆锚固张拉端锚固的方式,建立一种高效、便捷的预应力碳纤维板自锚方法;(4)对退役受损的预应力混凝土空心板梁进行静载检测评定,并应用自主研发的圆齿纹锚具及张拉自锚装置对其进行加固评定。试验结果表明采用圆齿纹锚具的张拉自锚系统能够可靠的应用于实际加固工程;对比分析加固前后空心板梁的静载试验结果,进一步印证了预应力碳纤维板加固技术能够抑制空心板梁挠度、应变的增长。
[Abstract]:Prestress technology is the most revolutionary structure conception in the field of concrete structure engineering in the 20th century, and has been widely used in civil engineering. Aiming at the disadvantage of the strain (stress) lag of the reinforced material after strengthening the bridge with load, the application of prestress to the carbon fiber slab and then the reinforcement of the bridge can effectively improve the utilization value of the material. It is expected that the prestressed carbon fiber sheet reinforcement technology will solve the problem of strain (stress) hysteresis after reinforcement. In order to develop a reliable, permanent prestressed carbon fiber slab Anchorage system and a simple and effective tension system, and successfully applied to the actual bridge reinforcement project, This paper mainly carries on the research and development of the new Anchorage used in the reinforcement of prestressed carbon fiber sheet and the experimental verification of the reinforcement effect. The main research contents and results are as follows: (1) aiming at the shortcomings of the traditional universal testing machine loading to determine the anchoring performance of the anchor. In this paper, a 10m long steel box girder is used as the tensioning pedestal, and a set of full-scale tensioning and anchoring test equipment for prestressed carbon fiber sheet Anchorage performance is developed, which aims at the problem of insufficient anchoring performance of traditional prestressed carbon fiber slab flat Anchorage. A new type of flat Anchorage with rough surface of round teeth is developed, which has the advantages of good mechanical properties and high anchoring performance. It improves the construction tensioning mode of the traditional CFRP flat Anchorage, and forgoes the anchoring method of anchoring the tensioning end with the tensioning rod. An efficient and convenient self-anchoring method for prestressed carbon fiber slabs is established. The static load detection and evaluation of prestressed concrete hollow slab beams with decommissioned damage are carried out, and the self-developed circular tooth thread anchors and tensioning self-anchoring devices are used to strengthen and evaluate them. The test results show that the tensioning self-anchoring system with circular tooth thread Anchorage can be reliably used in practical reinforcement projects, and the static load test results of hollow slab beams before and after reinforcement are compared and analyzed. It is further proved that prestressed carbon fiber reinforced concrete can restrain the deflection and strain growth of hollow slab beam.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.72

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