An Experimental Study of the Ductility of Concrete-Filled Square Steel Tubular

Abstract:

Abstract: In view of the seismic design requirement for ductility, a group of the cyclic loading experiment is carried out on seven concrete-filled square steel tubular with different axial load ratio, slenderness ratio and concrete grade. After that, the load-displacement curves and the skeleton curves of these frame columns are attained, together with the load-displacement value of each step. Based on these data, an analysis on various factors that affect the ductility of concrete filled steel tubular columns is conducted. The results show that the decline of the bearing capacity in the end-column is mainly due to the germination and expansion of the plastic hinge of pillar. Furthermore, increasing the axial compression ratio will lead to the earlier emergence of plastic hinges, which correspondingly reduces the ductility and horizontal anti-shearing capacity of the frame column. In addition, increasing slenderness ratio can contribute to delay the emergence of plastic hinges, which improves the ductility and energy dissipation capacity of columns, but decreases the horizontal anti-shearing capacity. As a result, adopting the higher grade concrete can effectively reduce the negative effects from the large values of axial compression ratio and slenderness ratio. The experimental results perfectly support the data from the finite element calculations.

• Periodical: Applied Mechanics and Materials (Volumes 174-177)
• Pages: 1003-1009
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.174-177.1003
• Online since: May 2012
• Authors: Chuan Guo Cai
• Keywords: Concrete-Filled Square Steel Tubular, Ductility, Plastic Hinge

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