The concrete-filled steel tubes have been widely used in buildings and civil structures.
However the corrosion of the steel tubes results in the loss of load carrying capacities of the members
and, therefore, there is a need for regular maintenance. To mitigate such maintenance issues and
prevent the loss of load carrying capacity, FRP composite were suggested as the candidate material. A
number of research works has shown that the use of FRP tubes produced by filament winding
technique was very effective on the improvement of compressive strength of the concrete-filled FRP
tubes (CFFT). However the filament wound FRP tubes did mot contribute to the increase of the
flexural strength of a CFFT. In this paper, a new type of FRP tube which consists of several pultruded
open sections assembled by filament winding technique is proposed to improve compressive strength
as well as flexural strength of a CFFT. The load carrying capacity of proposed CFFT is discussed
through the analytical investigation.
In the construction industries, in order to compensate material disadvantages of existing construction material (concrete, steel, wood, etc.) and satisfy requirements of the structural performance, research on durable and outstanding corrosion resistant fiber reinforced polymeric plastic (FRP) is actively underway. In general, a pile cannot be produced with unlimited lengths because of the size of the manufacturing machine and transportation to construction site. Therefore, the connection of pile and structural integrity of connection should be considered in the pile design. In this paper, hybrid FRP-concrete composite pile (HCFFT) was investigated by focusing on the connection of HCFFT members. The connection capacity of HCFFT was evaluated by the experiment and the finite element analysis. From the results appropriate connection method of HCFFT is discussed.
Due to the advantages of FRP composite such as corrosion resistance, light weight, high specific strength and stiffness, flexibility, etc., the use of FRP composite in construction sites is increasing steadily. Especially, high corrosion resistance is a very strong point of FRP composite. Although the FRP composite has many advantages, the material properties of FRP composite under various environmental conditions at the construction sites are not well investigated. In this paper, we present the results of experimental investigations of FRP composite experiencing freezing and thawing cyclic temperature. In this investigation, we performed experimental studies to find the stress versus strain characteristics of FRP composite experiencing freezing and thawing cyclic temperature variation. In the experimental program, strength and stiffness of the pultruded FRP composite specimens under uniaxial tension affected by the freezing and thawing temperature change mechanism are evaluated and the results are discussed.
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