A Tension-Resistant Device in Base Isolation

Abstract eng:
The elastomeric isolation system is not commonly adopted in high-rise construction and buildings with large aspect ratio, due to large overturning moment and subsequent development of tensile force at the base. Once tensile stress occurred in laminated rubber bearing, damage and cavities would expand inside the rubber which may lead to inestimable adverse effect on mechanical performance of isolators. A new type of tension restraining device to be used in conjunction with LRBs is proposed. This device aims to keep the tensile stress in the rubber under the limit value, while adapting to horizontal deformation of the rubber bearing. Numerical analysis and low-cycle load test of the prototype isolators with the tensionrestraint device were carried out. And an analysis model for a high-rise frame-core tube isolated building using rubber bearings was established. Time history analysis results indicate that large tensile stress happen in isolators under maximum considered earthquake (MCE).And the tensile constraining effect was verified by analysis. Further, a shake table test of a 1:15 scale isolated structure in accordance with previous analysis model is presented to investigate the performance of the proposed device under seismic excitation. Experiment results illustrate that installation of the tension restraint device in isolation floor would not influence the horizontal shear behavior of the bearing and the global behavior of the isolated structure. The tension-restraint devices are promising systems to use in high-rise buildings and buildings with large aspect ratio.

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