Experimental Study on Concrete-encased Steel Column Frames for Seismic Design of Transverse Reinforcement

• Main Authors: JHONG,JHIH-SIANG, 鍾智翔
• Other Authors: Yu-Chen Ou
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/q9pd95

碩士 === 國立臺灣科技大學 === 營建工程系 === 102 === Located on the Pacific Ring of Fire, Taiwan experiences numerous “feel able” earthquakes every year. Due to the dense population in Taiwan, high-rise buildings have become the trend for buildings of the future in Taiwan. High-rise buildings typically use steel structures due to the high ductility for seismic design and high construction efficiency. However, steel structures have low stiffness, high cost, and low fire resistance. Thus, steel structures are not suitable for residential buildings. Steel reinforced concrete (SRC) structures can improve the drawbacks of steel structures mentioned above. SRC structures not only preserve the high ductility advantage of steel structures but also have the advantages borrowed from reinforced concrete structures, i.e., high stiffness, reduced vibration and improved sound proof. This research focuses on concrete-encased SRC structures. The concrete-encased SRC structures have several advantages compared to other types of structures. Concrete provides lateral support to the embedded structural steel member, thus increasing the buckling resistance of the steel member and hence increasing the ductility and energy dissipation capacity. Moreover, concrete serves as fireproof to the steel member. The steel member provides confinement to concrete, increasing compressive strength and ductility of concrete. Due to the advantages mentioned above, concrete-encased SRC structures have become more and more popular in recent years. Previous research has indicated that existing Taiwanese SRC code provisions on the required amount of column transverse reinforcement for seismic design can not properly include the confinement effect from the steel member to concrete and does not consider the effect of axial load. The principal investigator of this proposal has proposed a design model to address this issue and has been verified by testing of large-scale members with various cross sectional shape of steel members, i.e., I shape, cross H shape, and T shape. A large scale SRC frame structure will be constructed and tested in this research. The SRC frame will be designed with various cross-sectional shapes of steel members with the amount of column transverse reinforcement determined based on the proposed model. Pseudo-dynamic and cyclic loading testing will be carried out. The objectives of this research are to examine the seismic performance of a SRC frame designed based on the proposed model for the amount of column transverse reinforcement and to further verify the model for future code implementation.