Vibration Control Of Ocean Platform Based On PFD-BRB System

Buckling-Restrained Brace is a new type of energy dissipation component, whichhas many advantages such as stable performance, good energy dissipation, constructionand installation convenience, economy and design flexibility without affecting thebeauty of the building and so on. It not only becomes the better choices of new seismicdesign, but also an important means of seismic strengthening and rehabilitation forexisting buildings. Frictional damper has broad application prospects because it canimprove seismic performance of structure with easy fabrication, simple installation, andeconomical applicability. In this paper, the traditional pall friction damping bracesystem has been improved. The ordinary braces are replaced with BRBs.The newsystem is called PFD-BRB system.Ocean platform structure is complicated and expensive. The surroundingenvironment is complicated and harsh. Ocean platform structure vibration controlprovides an alternative measure to ensure structure safety and durability. At the sametime, it can reduce the maintenance and repair fees of Ocean platforms. It is significantto study the platform structure vibration control.The main research contents of this paper are as follows:(1) Static cyclic tests were conducted on steel buckling-restrained braces to studythe hysteretic behavior and energy absorption capacity, etc. The performance of the newtype BRB was researched by finite element software ANSYS. Then, the experimentalresults and numerical simulation results were compared. The results demonstrate adesirable hysteretic behavior and energy absorption capacity of the brace. The resultscalculated by ANSYS are similar to those from the tests.(2) The experimental and numerical simulation on the PFD-BRB system is done.Then conclusions are drawn that the hysteresis loop of damper is full, and the BRB isalso comfirmed to have nearly the same yielding stress and ultimate strength undertension and compression. The PFD-BRB system can overcome the default of theordinary brace and make the force of the frame structure more reasonable. (3) Design procedures of BRB isolation scheme and PFD-BRB isolation schemefor JZ20-2MUQ Ocean platform have been presented. Based on ANSYS, thevibration control of ocean platform subjected to seismic waves loads and ices loads aredone. The results show that it can reduce the displacements of the jacket cap,acceleration of the deck, isolation layer displacement by BRB’s inelastic deformationand the energy absorption capacity of Pall-typed frictional dampers. The seismicperformance is improved, and it is a better scheme for ocean platform structure.