The The feasible useable study of Prestressed Concrete piles for Embankment structure in Bangkok

Abstract

Currently, there are several theories for the analysis and design of riverbank protection structures. These include the Free Earth Support Method, the Fixed Earth Support Method, and the Finite Element Method, each yielding different design outcomes. This research compares two theories with similar analytical principles: the Fixed Earth Support Method and the Finite Element Method. The commercial software SAP2000 was employed to analyze Bangkok soft clay, using soil test data from the Department of Public Works and Town & Country Planning. The research findings indicate that the Finite Element Method significantly results in lower internal structural forces due to its consideration of Soil-Structure Interaction and its different assumption regarding soil resistance compared to the Fixed Earth Support Method, where passive pressure is constant. This research also analyzed and designed reinforced concrete pile riverbank protection structures in both Free-Standing and Anchorage Pile configurations using the Finite Element Method. Furthermore, the program was calibrated using the Differential Equation Method, showing consistent results within decimal precision under the same analytical criteria, such as the soil modulus in the elastic range and the support at the pile tip. The design study also reveals differences in safety criteria and reinforcement requirements for each pile configuration, with piles having different moments of inertia also yielding varying results. It is noted that there may be other analytical criteria not considered in this study. This research provides a guideline for the analysis and design of riverbank protection structures and can be further applied in the future.