Abstract
Pall-typed frictional damper (PFD) has higher capacity of energy dissipation, whereas shape memory alloy (SMA) has excellent superelastic performance. Therefore, combining PFD and SMA together as a brace system has a great prospect in vibration control of structures. This paper investigates the performance of offshore platform with three structural configurations including the SMA brace system, the ISO-SMA (where ISO stands for isolation) brace system, and the ISO-PFD-SMA brace system, which are subjected to seismic and ice-induced excitations. In this study, PFD-SMA brace system is installed on the isolation layer of jacket platform, which is under earthquake excitations and ice loading. Then, the reduction of vibration is evaluated by using ANSYS program. The results show that the PFD-SMA brace system is useful in reducing the seismic response and ice-induced response of offshore platform structures; meanwhile, it also demonstrates excellent energy dissipation and hysteretic behavior.
Highlights
In 1947, the world’s first self-contained steel jacket offshore platform was built in the gulf of Mexico
A finite element model of JZ20-2MUQ platform with Pall-typed frictional damper (PFD)-shape memory alloy (SMA) brace system is built, and time history response of the model impacted by Tianjin, El Centro, and Taft seismic wave is analyzed
The results show that PFD-SMA brace system has good energy dissipation and good self-centering performance
Summary
In 1947, the world’s first self-contained steel jacket offshore platform was built in the gulf of Mexico. Research efforts have been made to use SMA based materials or devices for reducing earthquake damage of civil structures [2,3,4,5,6,7,8]: base isolation systems [2, 3], dampers [4], bracing systems for structure [5, 6], application in bridge [7], and beam-column connections [8]. A finite element model of JZ20-2MUQ platform with PFD-SMA brace system is built, and time history response of the model impacted by Tianjin, El Centro, and Taft seismic wave is analyzed. The results show that PFD-SMA brace system has good energy dissipation and good self-centering performance
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