4TH International Congress on Technology - Engineering & SCIENCE - Kuala Lumpur - Malaysia (2017-08-05)

A Recent Trend In The Field Of Frp Reinforced Concrete Structures In South Korea
As the growth of the society has been stabilized, the long-term maintenance of the infrastructures is to be significant issue rather than constructing new structures. In South Korea, the portion of construction budget has been steady and the rate of maintenance cost has been gradually increased by accumulating the number of target structures which the maintenance is required [1]. This can bring the construction policy review whether the government should increase entire construction budget or discuss an effective saving strategy in future. As enter the developed country, it is much harder to pick up the former one up. Therefore, the durability of structures is more important these days by extending the service life as long as before they are failed. One of the main reason to degrade the durability of the reinforced concrete structures is the corrosion of reinforcing steel bar. As an advanced technology to overcome the steel bar corrosion, FRP bar has been interested in the design of reinforced concrete structures because its higher durability and stronger tensile strength rather than those of reinforcing steel bar [2]. In South Korea, the structural application to the reinforced concrete structures with the various typed FRP bars such as deformed [3], fiber ribbed [4], and steel-frp hybrid [5] have been studied. For bond property, direct pull out and flexural bond test was conducted and its bond strength and slip relationship was examined as compared to those of the steel bar. For one-way concrete structure, FRP reinforced concrete beam was tested under flexure and its higher ultimate strength and lower stiffness was investigated as compared to those of the steel bar and a modified model for prediction of deflection was suggested [6]. For two-way concrete structures, the bridge deck slabs reinforced with the FRP bar was tested under static and fatigue loading and the punching shear behaviour was investigated when the slabs was designed by using the equivalent reinforcing ratio of FRP bar to the steel bar [7]. As an analytical approach, the existing punching shear formulas were reviewed and the probability-based new punching shear formula was suggested based on evaluating the test to predicted ratio and probability that the predicted strength excesses the nominal punching shear strength with the probability uncertainty [8]. Consequently, the concrete structures reinforced with FRP bar are widely researched in South Korea and the application to the construction field is going to be employed for highly durable and stronger concrete structures that can replace the steel reinforced concrete structures for long term durable concrete structures
Minkwan Ju