Papers by Author: Hong Taek Kim

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Authors: Joon Seok Park, In Kyu Kang, Jong Hwa Park, Joo Kyung Park, Hong Taek Kim, Soon Jong Yoon
Abstract: In construction industries, new construction materials are needed to overcome some problems associated with the use of conventional construction materials due to the change of environmental and social requirements. Accordingly, the requirements to be satisfied in the design of civil engineering structures are diversified. As a new construction material in the civil engineering industries, fiber reinforced polymeric plastic (FRP) has a superior corrosion resistance, high specific strength/stiffness, etc. Therefore, such properties can be used to mitigate the problems associated with the use of conventional construction materials. Nowadays, new types of bridge piers and marine piles are being studied for new construction. They are made of concrete filled fiber reinforced polymeric plastic tubes (CFFT). In this paper, a new type of FRP-concrete composite pile which is composed of reinforced concrete filled FRP tube (RCFFT) is proposed to improve compressive strength as well as flexural strength of an RCFFT. The load carrying capacity of proposed RCFFT is discussed based on the result of experimental and analytical investigations.
Authors: Hong Taek Kim, Chan Ho Yoo, Jung Soon Hwang, Young Jong Sim
Abstract: In this study, porous concrete is applied to the stone column, which is a structural foundation in soft ground. The porous concrete reinforces the upper portion of the stone column and forms a composite foundation to restrain bulging collapse. To function as a foundation material properly in soft ground, concrete must be permeable to expel subsurface ground water outside and have sufficient compressive strength to reduce settlement, which is a critical factor for the foundation design. From laboratory experiments, the compressive strength increases and the permeability decreases as the amount of cement increases. To evaluate the settlement, full-scale tests and finite element analyses using porous concrete were performed. As a result, it was confirmed that the use of a stone column reinforced by porous concrete was very effective in reducing the settlement of the foundation in soft ground.
Authors: Young Geun Lee, Seung Sik Lee, Jeong Hun Nam, Hong Taek Kim, Soon Jong Yoon
Abstract: Fiber reinforced plastic structural shapes are readily available in civil engineering applications. Especially, pultruded fiber reinforced plastic is an attractive construction material for structural applications because it can be produced in mass production, and it has good mechanical and chemical properties compared with existing conventional structural materials. To be used in the construction field, connection of the pultruded structural member is unavoidable. Bolted connections may be the most suitable option for civil engineering applications compared with bonded connection. However, bolted connection has disadvantages such as reduction of strength due to bolt holes in the connection. Experimental and analytical studies on the bolted connection of PFRP plated member have been carried out. Four different types of connection distinguished by number and arrangement of bolt holes are investigated. Geometrical test parameters are edge distance, width, and longitudinal and transverse spacing. The effects of the parameters are evaluated and quantified based on the observations, such as failure load and failure mode, obtained from the experiment. In addition to the experimental investigation, analytical study is also conducted to predict the failure load of the member with bolted connection.
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