Abstract
AbstractIn this paper, the radial deformation of fiber reinforced self‐compacting concrete (SCC) pipes under cyclic fire conditions is studied. A series of experimental study on the temperature fields and radial deformation properties of steel mesh, polypropylene fiber (PP fiber), and macro steel fiber (SF) reinforced SCC pipes subjected to fire is carried out. A novel method for measuring the deformation of pipes under high temperature has been proposed. The results indicate that both micro PP fiber and macro SF are effective in decreasing the temperature difference and reducing the radial deformation in each thermal cycle. A significant positive synergistic effect on decreasing the residual radial deformation can be achieved by combined use of macro SF and micro PP fiber. The elastic theory is used to estimate the elastic portion in the total radial deformation, and the elastic radial deformation is about 22.3% of the maximum radial deformation in the first thermal cycle. Based on the elastic calculation and observed experimental results, a simplified method for estimating the maximum radial deformation in the first thermal cycle is proposed.
Highlights
Fiber reinforced concrete (FRC) has been increasingly used in many civil engineering structures such as high-rise buildings, bridges, highway and pipes[1,2,3,4]
The temperature-time curves of the heated gas, the inside layer, the middle layer and the outside layer of the steel mesh reinforced self-compacting concrete (RC) pipes, steel fiber (SF), PP fiber and hybrid fiber reinforced concrete pipes are illustrated in Fig.5, Fig.8 and Fig
The experimental results demonstrate that the radial deformation reaches the maximum when the temperature difference reaches the maximum
Summary
Fiber reinforced concrete (FRC) has been increasingly used in many civil engineering structures such as high-rise buildings, bridges, highway and pipes[1,2,3,4]. Several tests have been developed to investigate the thermal and mechanical behavior of FRC specimen during and after high temperature exposure, including the stress and strain, thermal expansion or cracking and spalling behavior [22,23,24] They are carried out in the electrical furnace, which offers a relatively uniform temperature distribution around the structural members. The objectives of fire-resistant FRC pipe member under fire include a number of issues such as the heat-transfer mechanisms, spalling behavior, cracking and smoke spread, manufacturing and material properties [2527]. It is not intended in this study to present a complete knowledge of every aspect of the FRC pipe. In order to estimate portion of the elastic radial deformation compared to the total radial deformation and to evaluate the maximum radial deformation, a simplified method is suggested based on the elastic calculation and observed experimental results
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