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Design and Behavior Research on Self-locking Anchor System of FRP

Author: LiJi
Tutor: ZhouChangDong
School: Beijing Jiaotong University
Course: Structural Engineering
Keywords: FRP sheet self-locking anchor system(SLA) prestressing strengthen stress loss concrete column
CLC: TU757.2
Type: Master's thesis
Year: 2011
Downloads: 65
Quote: 4
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Abstract


The concrete column reinforced with pre-stressed FRP sheet is a new strengthening technology. By using this technology, strength of FRP can be fully used; crack generation and expansion of concrete can be confined; durability, ductility, bearing capacity and seismic behavior of concrete columns can be improved significantly. For these is not a set of effective prestressing and anchoring system in domestic and foreign, this paper presents a new anchorage system-self-locking anchor(SLA).The preliminary theory and the experiment about the SLA are discussed in this article by focusing on the SLA. The main work can be listed as follows:(1) The design axiom and the manufacturing process of the SLA are stated. The SLA is composed by the anchor heads, the bolt and FRP sheet. According to the demand, it can also be made into locking system for single sheet or the double sheets.(2) The pre-stress of the SLA can be controlled by the torque wrench. In this paper, the empirical formula between the torque and the pre-stress level was put forward by regressing 5 groups of experiment.(3) By using different methods for compound the SLA, the efficiency of the pre-stress is different. The merit and demerit of two different kinds of combination was compared by research on the experiment and theory analysis.(4) In the process of strengthening the structure by applied pre-stress, loss of pre-stress is unavoidable. Items related to the loss of pre-stress that will appear in the SLA’s using process were studied. Through theory reduction and analysis, the regularities of pre-stress loss were obtained and suggestions for reduction in pre-stress loss were given.(5) The limited loaded damage test was applied on the 8 groups of test-piece which had gone through 850 hours after loss of pre-stress. By combining to the theoretical analysis, the damage reasons were found. The long-term effectiveness and reliability of the SLA can be proved.

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CLC: > Industrial Technology > Building Science > Construction > The project and the type of work > Prestressed reinforced concrete structures projects > Prestressing tendons anchoring and fixture
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