Abstract
The damage to structures caused by the velocity pulse effect of near-fault earthquake waves cannot be ignored, yet there are few studies on the risk assessment of seismic performance for precast concrete frame under near-fault earthquake waves. A novel self-centering precast concrete (SCPC) frame with hysteretic dampers is proposed to obtain great self-recovering and energy consumption characteristics. To accurately assess the seismic behaviors of the novel SCPC frame under the near-fault earthquake waves, a prototype structure is modelled and elastoplastic dynamic analysis is conducted at the design basis earthquake (DBE) and the maximum considered earthquake (MCE) seismic levels. Incremental dynamic analysis and the vulnerability analysis are performed. Annual and 50-year exceeding probabilities of the novel SCPC frame are calculated afterwards. In addition, the reinforced concrete (RC)frame and the traditional SCPC frame are also modelled, whose section sizes, reinforcements arrangement and seismic intensity are consistent with the novel SCPC frame. The dynamic time-history analysis at the two seismic levels are also carried out for two types of frames. The analysis results demonstrate that the novel SCPC frame has great seismic performance and low seismic risk possibility under the near-fault earthquakes loading.
Highlights
At present, the velocity pulse effect caused by near-fault earthquake waves has attracted the extensive attention of researchers
Nonlinear time-history analysis is applied to the five-story four-span novel self-centering precast concrete (SCPC) frame numerical model at the design basis earthquake (DBE) and maximum considered earthquake (MCE) earthquake levels using OpenSees software
This study develops a new self-centering precast concrete (SCPC) frame with hysteretic dampers
Summary
The velocity pulse effect caused by near-fault earthquake waves has attracted the extensive attention of researchers. The velocity pulse effect of near-fault earthquake waves can increase the seismic energy and cause serious damage to the structure and leave a permanent displacement. Since the velocity pulse effect of near-fault earthquake waves can generate more significant inelastic deformation, many structural systems with high ductility and effective seismic energy dissipation have been developed in recent years. To further enhance the energy consumption capacity, maintain the self-recovering capacity and reduce the local concrete damage; this study develops a new kind of hybrid self-centering precast (SCPC) frame joint with hysteretic dampers. In this novel connection, Post-tensioned (PT) tendons undertake moment and maintain the self-recovering capability after the ground motion loadings. Considering the near-fault’s strong velocity pulse effect, the analysis results validate the great seismic performance and low seismic risk possibility of the novel SCPC frame
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