Study of the failure mechanism for footings subjected to tension and lateral loads using digital photogrammetry program (Laboratory Study).

Abstract

This research examines the behavior of shallow footings subjected to vertical load and lateral forces, with a specific focus on the construction of high voltage electrical networks in Egypt. These projects necessitate the installation of thousands of lattice towers of varying shapes and sizes. Given the significant cost associated with foundation works in transmission projects, understanding the pullout resistance of footings is crucial for achieving cost-effective and rational designs. The study investigates the impact of various parameters, including soil type and the ratio of foundation depth to footing width, on the uplift capacity and failure mechanisms of shallow footings under vertical and horizontal forces. A comprehensive a number of laboratory examinations were conducted using footing dimensions of 3.5×7 cm, 5×10 cm, and 7.5×15 cm. Tests were performed at relative densities of 100% and 92%, with foundation depth to footing width ratios of 1, 1.5, and 2.5. Experimental work was carried out in a steel tank with internal dimensions of 0.60×0.40 m in plan and 0.40 m in depth. A digital photogrammetry program was employed to measure the complete displacement field within the soil mass. These techniques provide valuable insights into the behavior of shallow footings under the specified loading conditions, contributing to the optimization of foundation design for transmission projects. By focusing on the parameters that influence the pullout resistance and failure mechanisms of shallow footings, this study aims to improve the understanding and design of foundations for high voltage electrical networks, ensuring both economic efficiency and structural integrity.