Shaking table tests and numerical analysis of RC coupled shear wall structure with hybrid replaceable coupling beams

Abstract

A variety of innovative structural solutions have been recently introduced to mitigate damage and expedite the repair of buildings subjected to extreme seismic events, hence contributing to the urgent need for resilient societies. In this context, the present study experimentally and numerically investigates an innovative reinforced concrete (RC) shear wall (SW) structure with replaceable coupling beams (CBs) equipped with hybrid devices. These hybrid devices couple metallic and viscoelastic dampers and aim at satisfying multiple lateral load performances effectively. To assess the seismic performance of the proposed coupled SW system and verify the design principle, comparative shaking table tests were performed on two 1/4‐scale seven‐story SW structure specimens, including a conventional RC coupled SW and the proposed coupled SW with hybrid devices. The tests results indicate the improved performance of the proposed compared with the conventional system in terms of: (1) reduced interstory drifts and story accelerations demand under a wide range of seismic intensities, (2) concentrated damage in the hybrid device and minimal damage to the other components contributing to the reparability of the structure. Furthermore, 3D finite element models for the shaking table test specimens were established in OpenSees and validated against experimental response. Successively, a numerical parametric study was conducted by performing non‐linear response history analyses under a set of 22 ground motions to investigate the influence of different design configurations of the hybrid device on the peak interstory drifts and peak story accelerations.

Model updating of a shear‐wall tall building using various vibration monitoring data: Accuracy and robustness

“…The errors are reduced noticeably at the higher stories when the FE model is updated using both accelerations and top displacement measurements (i.e., J a,d ). Overall, the analysis using the experimental data in Gong et al 48 reaffirms that using multi-source monitoring data (e.g., the combinations of accelerations and top displacement) could generate a more accurate and robust FE model than acceleration measurements alone.…”

“…Next, the effects of multi-source vibration monitoring data on the accuracy and robustness of FE model updating are validated using the experimental data reported by Gong et al 48 The examined structure was a laboratory-scaled 7-story core-wall building (see Figure 13). Each story was 900 m high and had a planar dimension of 1300 mm  1800 mm.…”

“…The wall and the slab had a thickness of 75 and 40 mm, respectively. The crosssectional areas of the coupling beams were 75 mm  150 mm, while their lengths were 500 mm along the X direction and 600 mm along the Y 48 ): (a) elevation view and (b) plan view. The building was first subjected to Shanghai artificial earthquake and followed by El Centro earthquake with PGAs of 0.14 g (see c), along its X direction.…”

“…T A B L E 4 Identified optimal parameters p à of the core-wall building in the experiments conducted by Gong et al 48 The FE models are updated using the measurements collected under the Shanghai artificial earthquake. The acceleration measurements at the odd stories are adopted for model updating.…”

“…All accelerometers and displacement sensors operated with a sampling frequency of 256 Hz. For details, please refer to Gong et al 48 The building was subjected to the Shanghai artificial earthquake, followed by the El Centro earthquakes along its X direction (Figure 13c). The PGAs of these earthquakes were scaled to 0.14 g.…”