Study on Performance-Based Earthquake Engineering for Pile Foundations

• Main Authors: Tzu-Yi Yang, 楊子逸
• Other Authors: 張德文
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/01984299741090409499

碩士 === 淡江大學 === 土木工程學系碩士班 === 97 === This study intends to estimate the seismic performance of piles based on PBEE analysis. The PBEE analysis for geotechnical structures requires the concerns of varying earthquake, soil parameters and geology conditions. It is not only for design purpose, but also for decision making. The valuable parameters can include IM, EDP, DM and DV. One can analyze the probability of annual exceedance for these parameters from PSHA, and discuss the performance of a specific pile foundation based on PEER Framing Equation. This study adopts EQWEAP module to study the seismic performance of a specific pile at four major cities in Taiwan. With the recent representative earthquakes affecting four cities, the medium and design as well as the most concern earthquakes were studied for a certain single pile located in a typical soil profile. The largest pile displacements, selected as EDP , were examined whereas the possible failures were recorded. The maximum pile displacements at different performance levels in these metropolitans were obtained and analyzed to achieve the relationships of the annual rate exceedance and the maxim pile displacements. The influences of the esign factors were discussed. The observation are summarized as follows: (1) The pile displacement hazard in Taichung is the smallest, whereas Yilan has the highest, this is significantly dependent of the seismicity and geological conditions of the site. (2) Enhance the design by increasing the pile diameter and so for may reduce the pile displacement, however the influence in the response hazard curve may not that significant. This reveals clearly the resulting difference between deterministic design and probabilistic design. (3) The seismic hazard of the pile response is dependent of the site conditions, not only the ground stiffness but also the depth of bedrock will affect the results. The analysis must be at project level, and the damage measure of the pile should be taken into account. (4) The EQWEAP analysis is compiled well with the PSHA in this case. Modification of the work can be done with the concerns of soil-cap-pile interactions, material models and the influences of the soil parameters.