dc.title: Development and validation of a precast column solution for Texas bridges dc.description.abstract: This dissertation examines a novel construction method utilizing Precast Prestressed Concrete Piles (PCP) filled with concrete cast-in-place, working as one complete column to evaluate their structural performance under varying levels of eccentricity, with the goal of introducing a new precast column system. A control specimen was constructed cast-in-place, following traditional methods according to current bridge design standards, and tested to establish a baseline for comparison. Once the behavior and performance of the control specimen were understood, the proposed construction methodology was applied to four precast columns. These precast columns underwent testing using the same procedures as the control specimen, while also analyzing various factors such as the internal roughness of the precast elements (PCP) and the embedment length for the connectors.
The results indicated that precast specimens with a longer embedment length exhibited performance comparable to the control specimen, despite differences in internal roughness among the specimens. Conversely, precast columns featuring an intentionally roughened interior and a shorter embedment length displayed a decrease in load-carrying capacity. A composite section was achieved between the precast column and the cast-in-place core without employing shear connectors, resulting in a satisfactory non-contact splice. This finding suggests that the proposed methodology can be effectively utilized in future construction projects. Based on the experimental results, a finite element analysis is conducted to calibrate a model and align its behavior with computer software. This approach provides an opportunity to explore additional variables and validate the assumptions made during the experimental testing. Given the complex transition from a circular to a rectangular shape, this research presents several challenges that must be meticulously addressed during the analysis. Through experimental and finite element analysis, a design procedure has been proposed to address a noticeable gap in bridge design. Since the column is the only component not precast, this procedure aims to provide engineers with a new tool for enhancing design and construction practices.