研究期間：10108~10207;High Performance Fiber Reinforced Concrete (HPFRC) is distinguished from the traditional reinforced concrete (RC) and fiber reinforced concrete (FRC) by its unique strain-hardening behavior in tension, which translates into enhanced ductility and crack-width controlling ability, enabling reduction of steel confinement and simplifying construction techniques. It has been shown that HPFRC has potential in increasing the durability and service life for infrastructures. The material is also promising in reducing the cost associated with maintenance and retrofitting in the long term. The goal of this project is to investigate the effectiveness of applying HPFRC to beam-column joints to enhance the performance of seismic resistance. In order to study the performance of the developed HPFRC in material level, the project will first conduct material tests, including direct tensile test, compression test, and steel rebar pullout test. After that, a number of beam-column joints with simplified reinforcement details and reduced reinforcement amounts will be designed and constructed. The specimens will be tested to investigate their seismic behavior using cyclic-loading tests. In addition, HPFRC will be used to retrofit the beam-column joints which represent the deficient structural components that were designed and built in the early 70s and characterized by low ductility and strength. The effectiveness of using HPFRC for structural retrofitting will then be investigated. In addition to the experimental investigation, the project will develop a numerical model for HPFRC. The seismic behavior of various types of HPFRC structural elements will be simulated. The research presented herein will provide insights into the high performance green materials for new seismic-resistant structures and old structure retrofitting. It is also contributive to the development of durable and sustainable infrastructures.
