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Development for New Performance of Structural Concrete Members by Using Fiber Reinforced Plastics

利用纤维增强塑料开发混凝土结构构件新性能

基本信息

批准号：
04555112
负责人：
SAEKI Noboru
金额：
$ 7.68万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04555112/
关键词：
Continuous fiber FRP rod PC pole Parallel lay rope Aramid fiber External cable Low temperature Fatigue シート接着コンクリート桁アラミドケーブル外ケーブル方式エポキシ樹脂変形耐力

项目摘要

The applicability of FRP rods for tendons of pre-tension type PC poles has been investigated. The cracking load, deformation and failure load are capable to be predicted by the traditional theory of the prestressed concrete. Adjusting the amount of reinforcement and prestress, the failure mode becomes ductile without the break of FRP rods. The reduction of prestress by creep and drying shrinkage is also predicted by traditional theories. Though the amount of relaxation depends on the type of FRP,by using each value traditional equation may be applicable.Parallel lay rope (PLR) is a flexible rope-like material consists of a parallel array of fibers encased in a polymeric sheath. The strength and the deformation behavior of prestressed reinforced concrete beams with aramid fiber PLR as external cables were investigated. By strengthening the reinforced concrete beam after occurrence of cracks by external cables, stiffness and strength of the beam increase. As the stress of cables are controlled by the equation considering the plastic capacity of beam, the failure mode can be ductile without the break of cables. As for the static behavior under low temperature, though the strength increases compared with normal temperature, the ductility decreases because the ultimate deformation becomes small. As for the fatigue strength under low temperature, the failure mode is the break of reinforcements. The S-N curve becomes linear and the equation of JSCE overestimates the strength.

研究了FRP杆对预张式PC杆筋的适用性。预应力混凝土的开裂荷载、变形荷载和破坏荷载可以用传统的预应力混凝土理论进行预测。调整配筋量和预应力，破坏模式变为延性，而不会使 FRP 杆断裂。传统理论也预测了蠕变和干燥收缩会导致预应力降低。尽管松弛量取决于 FRP 的类型，但通过使用每个值，传统方程可能适用。平行捻绳 (PLR) 是一种柔性绳状材料，由包裹在聚合物护套中的平行纤维阵列组成。研究了芳纶纤维PLR作为外索的预应力钢筋混凝土梁的强度和变形行为。通过外部缆索对出现裂缝后的钢筋混凝土梁进行加固，可提高梁的刚度和强度。由于缆索的应力由考虑梁塑性能力的方程控制，因此失效模式可以是延性的，而不会使缆索断裂。对于低温下的静态行为，虽然与常温相比强度有所增加，但由于极限变形变小，延展性降低。对于低温下的疲劳强度，其失效模式是增强体的断裂。 S-N 曲线变为线性，JSCE 方程高估了强度。