Design and experimental verification of a new multi-functional bridge seismic isolation bearing

Multi‐stage superelastic variable stiffness pendulum isolation system for seismic response control of bridges under near‐fault earthquakes

“…Note that the lateral stiffness of the flat sliding surface R 0 is sustained by SMA device. Though the friction force varies due to the variation of temperature, the stable hysteretic mode for the multi‐stage SVSPI system, that is, the slider slides to accommodate the thermal movements under service loadings and functions seismic isolation under earthquakes compared with the isolators in previous studies, 14,19 the hysteretic mode of which is sensitive to temperature variations.…”

“…Compared with friction pendulum bearing, the pure‐friction sliding bearing shows much less sensitivity to the earthquake spectral characteristics 16 and can also address the thermal deformation of the superstructure by sliding freely and suppress the seismic shear to be maximum friction force 17,18 . In view of the advantages of the pure‐friction sliding bearing, the sliding‐lead rubber bearing has been developed by combining the lead rubber bearing with the pure‐friction sliding bearing in series to improve the adaptability 19,20 . However, the experimental results show that the hysteretic behavior of the sliding‐lead rubber bearing depends on the relationship between the friction force of the pure‐friction element and the yield force of the LRB element 20 .…”

“…17,18 In view of the advantages of the pure-friction sliding bearing, the sliding-lead rubber bearing has been developed by combining the lead rubber bearing with the pure-friction sliding bearing in series to improve the adaptability. 19,20 However, the experimental results show that the hysteretic behavior of the sliding-lead rubber bearing depends on the relationship between the friction force of the pure-friction element and the yield force of the LRB element. 20 The mechanical characteristics, for example, the friction coefficient and yield force of the LRB element, show sensitive to ambient temperature and the hysteretic mode is uneasy to be controlled under extreme service loadings.…”

Damping enhanced novel re-centering seismic isolator incorporating superelastic SMA for response control of bridges under near-fault earthquakes

“…Particularly, seismic isolator plays a crucial part to prevent damage and [14], can slide freely to address the thermal deformation of the bridge deck and limit the peak seismic shear to friction force [15,16]. Xing and Wang [17,18] integrated the advantages of the pure-friction flat isolator connected in series with LRB and developed the sliding-LRB to enhance the adaptability for service loadings and earthquake ground motions. Note that the experiments conducted by Xing and Wang [17] show that the damping capability of the sliding-LRB is closely related to the friction force and allowable sliding distance, i.e.…”

“…Xing and Wang [17,18] integrated the advantages of the pure-friction flat isolator connected in series with LRB and developed the sliding-LRB to enhance the adaptability for service loadings and earthquake ground motions. Note that the experiments conducted by Xing and Wang [17] show that the damping capability of the sliding-LRB is closely related to the friction force and allowable sliding distance, i.e. the damping capability can be effectively enhanced when choosing reasonable friction coefficient.…”