A Study on Design Method for strengthening of Existing Concrete Structures using Advanced Reinforcing Materials

本研究旨在开发一种设计方法，以加强使用玻璃钢板和玻璃钢帐篷来增强可持续的混凝土结构。本研究的结果总结了以下三个点; （1）再输入材料的长期性能;（2）用玻璃钢表格修补混凝土成员的最终容量和变形;（3）用玻璃钢帐篷修补混凝土结构的最终容量和变形。（1）强化材料的长期特性·放松比表示每个FRP Tendon和不同元素的自然特征在其转化为通过时间的逻辑加载时间范围。玻璃钢纸的张力强度和粘结强度即使在六个月后也不会减少玻璃钢纸在10%的硫酸溶液中。（2）用玻璃钢板修正混凝土成员的最终能力--它是如何清晰的混凝土强度，以及玻璃钢板板对玻璃钢板的粘结机制的硬度。债券强度的平衡已经被提出了。当玻璃钢板的剥离时，它被附着在光束上的低脸上，就像柔性再强制不发生，光束的弯曲能力和变形可以被分层程序预测。由于失效模式，在剪切机上剥离玻璃钢板，预测玻璃钢板板的剪切再强制效应的模型被提出。（3）用FRP Tendons改装的混凝土结构的最终容量和变形--外部预制光束的柔性行为可以通过精确计算方法来估计，以确保电缆位置的变形和变化的兼容性。玻璃钢张力的最大强度在deviators中变得更少，然后是唯一的张力强度。不同类型的玻璃钢张力的减少差异的速率。当一个电缆张力力在40 - 50%的正常中断负载范围内，在2，000，000循环负载期间失败时，没有发生故障。

This study is carried out to develop the design method for strengthening of exsisting concrete structures using FRP sheets and FRP tendons. Results in this study are summarized on the following three points ; (1)Long term properties of reinforcing materials, (2)Ultimate capacity and deformation of concrete members retrofitted with FRP sheet, (3)Ultimate capacity and deformation of concrete structures retrofitted with FRP tendons.(1) Long-term Properties of Reinforcing Materials・The relaxation ratio represents the natural characteristics of each FRP tendon and varies in proportion to the logarithm of time throughout the entire loading time range.・The tensile strength and bond strength of FRP sheet were not reduced even after FRP sheet is soaked in 10% sulfuric acid solution for six months.(2) Ultimate Capacity of Deformation of Concrete Members Retrofitted with FRP Sheets・It was clarified how concrete strength, and stiffness of FRP sheets affect the bond mechanism of FRP sheet. The bond strength equation was proposed.・When peeling of FRP sheet which is attached to a lower face in a beam as flexural reinforcement does not occur, the bending capacity and deformation of the beam can be predicted by the layr-by-layr procedure.・For failure mode with peeling of FRP sheet along a shear crack, the model of predicting the shear reinforcing effect of FRP sheet was proposed.(3) Ultimate Capacity and Deformation of Concrete Structures Retrofitted with FRP Tendons・The flexural behavior of externally prestressed beams can be estimated by a precise calculation method considering the compatibility of deformations and changes in location of cables.・The ultimate strength of FRP tendons at deviators becomes less then the uniaxial tensile strength. The rate of reduction differs for different type of FRP tendons.・When a cable tensile force was within the range of 40 to 50% of the nominal breaking load for AF rope, failure did not occur during the the 2,000,000-cycle loading.