Response of Lead-Rubber Bearing Isolated Structure

Abstract eng:
A GF+7 storey, orthogonally almost symmetric, shear wall residential tower building has been studied in all details in order to clarify the influence of lead-rubber bearings (LRB) seismic isolation upon its seismic performance. The ambient vibration measurements of the building have been performed by 6 GPS synchronized MICROMED's TROMINO seismometers, out of which 2 TROMINOs were fixed at the top of the building for providing GPS associated 3D ambient vibration recordings during the entire course of the measurement (4 hours). Mobile set of 4 TROMINOs has been used to acquire GPS synchronized recordings at all 4 corners and each storey of the building. Mode shapes, natural frequencies and damping ratios of the existing fixed-base building are obtained by ARTeMIS (Ambient Response Testing and Modal Identification Software) processing of the acquired signals and used for verifying the formulated analytical model. The LRB seismic isolation system consisting of 32 LR bearings has been designed for maximum expected earthquake in accordance with USB-97 code provisions. Four different real-earthquake time history acceleration records were used to quantitatively define and compare nonlinear responses of fixed-base and LRB isolated structures. The paper details the results and findings of this study that result in substantial elongation of the fundamental period as well as reduction of interstory drifts, floor accelerations and base shear of isolated relative to fixed-base building.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket