Performance of Rubberized Pozzolanic Concrete Filled Steel Tube Under Lateral Cyclic Loading
摘要
The utilization of rubberized concrete as infill material in concrete-filled steel tubes (CFST) increases the ductility and energy dissipation of the column, whereas the axial capacity and stiffness of the column decrease due to the lower strength of the rubberized concrete. This study aims to determine the cyclic performance of rubberized pozzolanic concrete-filled steel tube column (RuPCFST) using modified rubberized concrete in comparison to normal concrete-filled steel tube column (NCFST). Two types of concrete were used as infill concrete: normal concrete (NC) and rubberized pozzolanic concrete (RuPC). The RuPC contained 5% crumb rubber replacing fine aggregate and 10% fly ash replacing cement with the usage of 0.45 water-cement ratio. Two types of axial load conditions: 0 and 20% axial load were considered during the testing. The results show an increase in stiffness and energy dissipation of the columns when the axial load was applied to the column. The stiffness degradation and strength of columns with normal concrete and rubberized concrete infill behave in a comparable pattern. However, RuPCFST shows higher improvement in energy dissipation capability compared to NCFST. Results obtained demonstrate that RuPCFST exhibited comparable stiffness to that of NCFST, but with higher energy dissipation capability, thus can be considered to be used in low to moderate seismic prone areas.