Abstract
In this study, the characteristics of the compression behavior of polyurethane springs that can be used as compression members of seismic devices, such as dampers and seismic isolators, were identified, and the effect of the design variables on the performance points of polyurethane springs was investigated. Compressive stiffness and specimen size were set as the design variables of the polyurethane spring, and the performance indicators were set as maximum force, residual strain, and energy dissipation. A total of 40 specimens with different conditions were fabricated and a cyclic loading test was performed to obtain the force-displacement curve of the polyurethane spring and to check the performance indicator. Significant strength degradation was confirmed after the first cycle by repeated loading, and it was confirmed that compressive stiffness and size demonstrated a linear proportional relationship with maximum force. In addition, the design variables did not make a significant change to the recovered strain, including residual strain, and residual strain of about 1% to 3% occurred. Energy dissipation showed a tendency to decrease by about 60% with strength degradation after the first cycle, and this also demonstrated no relationship with the design variables. Finally, the relationship between the design variables and performance indicators set in this study was reviewed and suggestions are presented for developing a simple design formula for polyurethane springs.
Highlights
In recent years, we have witnessed the widespread use of elastomeric polymers in engineering applications such as base isolators, structural dampers, and vibration control springs [1,2]
Study,the thecompression compressionbehavior behavior characteristics of polyurethane springs be used as compression members in seismic devices, such as dampers and seismic isolators, can be used as compression members in seismic devices, such as dampers and seismic were experimentally verified
A cyclictest loading test was performed on 40 specidifferent conditions, and size and compressive stiffness were set as the design variables
Summary
We have witnessed the widespread use of elastomeric polymers in engineering applications such as base isolators, structural dampers, and vibration control springs [1,2]. In advanced seismic design, buildings are considered based on a low-damage self-centering system with replaceable fuse devices specially designed with the aim to sustain large deformation [5,6,7,8,9,10,11,12]. In this way, some researchers have tried to design structural damper systems using materials with self-centering characteristics, such as applied superelastic shape memory alloys (SMA) [13,14,15,16,17].
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