| Summary: | 碩士 === 國立中央大學 === 土木工程學系 === 101 === Highly ductile fiber reinforced cement-based composites (HDFRCCs) are distinguished from regular concrete material by their strain hardening behavior accompanied by multiple narrow cracking under tension. It was reported that the maximum tensile strain of HDFRCC can be 2 orders in magnitude larger than that of regular concrete. When HDFRCCs are under compression, the introduced fibers act like stirrups, making HDFRCCs behave like confined concrete with improved strength capacity and ductility. These advantages in material scale transform into the enhanced shear resistance, ductility, damage tolerance, and energy dissipation capacity in structural scale. One objective of this dissertation is to develop a structural scale model for HDFRCCs that can be used to effectively analyze the seismic behavior of large structures made of HDFRCCs. The developed HDFRCC element consists of a beam column element, a rotational spring, and a translational spring. While the axial and flexural behavior of HDFRCC structures are simulated using beam-column elements with fiber sections, the effects of shear response and bond slip on the HDFRCC structures are addressed using spring models. The performance of the HDFRCC element is evaluated using extensive experimental data from tests on several types of HDFRCC structures. It is concluded that the developed numerical model is capable of modeling the general nonlinear behavior of HDFRCC structures under cyclic loading with reasonable accuracy. In addition, the developed material model is employed to compare the seismic performance of traditional RC coupled walls with the counterpart incorporating HDFRCC. The analysis results provide value insights into the advantage of using HDFRCC to replace regular reinforced concrete in the critical regions of coupled walls.
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