Study on Seismic Performance of Single Pile Foundations in Liquefiable Sites Based on Vulnerability Analysis
Pile foundations are a common form of deep foundations in liquefiable sites,with wide-spread applications in coastal ports and large buildings.Evidence suggests that cases of pile foundation damage caused by earthquakes in liquefiable sites are common.To evaluate the seismic performance of single pile foundations in liquefiable sites,a dynamic interaction finite element numerical model was established using the Opensees computational platform,based on centrifuge tests.The results were compared with existing experimental data to verify the model′s validity.Based on this,the effects of soil liquefaction,overlying hard soil layers,and superstructure on the seismic response of the system and the seismic performance of pile foundations were analyzed.Pile head displacement and curvature were used as seismic performance indicators,and pushover analysis was employed to obtain the threshold values of seismic vulnerability under different damage states.Peak Ground Acceleration(PGA)was utilized as the intensity measure for seismic motion.A probabilistic seismic demand model was developed using cloud analysis,which led to the creation of vulnerability curves of pile founda-tions,assessing the damage probability for different performance states.The results showed that soil liquefaction,overlying hard soil layers and superstructure all increased the curvature and displacement demands on the pile,and the damage probability of pile foundations.
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维普
