| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 103 === Reinforced Concrete is used for most building in Taiwan. This is due to the advantage on fire resistance, high durability, low-cost and easy maintenance. The rapid growth of population and economic development increase the demand of high-rise building, which provides advantages in the dense area. Since Taiwan was located in Circum-Pasific seismic zone, using normal strength of RC for high-rise building will produce lack of space and high construction cost. RC with high-strength materials offers many benefit such as reducing member dimension and reinforced cages, increasing space at the lower story.
In this study, an experimental testing was conducted as the continuation of previous study (Ou and Kurniawan; Ou et. al). Six half-scale double curvature columns were constructed and tested under the combination of cyclic loading and constant axial compression. The specified concrete compressive strength is 70 MPa. High-strength longitudinal (SD 685) and transverse (SD 785) reinforcement having specified yield strength 685 MPa and 785 MPa were used, respectively. The key parameters considered in the experimental program were Varian of axial compression and amount of shear reinforcement. A set database of 86 column test from other researchers and experimental result was built to evaluate the current ACI 318 nominal shear for high-strength reinforced concrete column. Based on the experimental result and evaluation of shear strength model on column database, a set of shear design provision of high-strength reinforced concrete column are proposed.
This study proposed a formulation which is can provide internal stress redistribution and provide early warning in New RC Column. The proposed shear strength model provides conservative estimation for column under varied axial load compression. It is recommended to limit the concrete compressive strength up to 130 MPa and yield strength of shear reinforcement up to 600 MPa.
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