Abstract
The bending capacity of concrete-encased underground electrical duct banks has been the subject of considerable investigation using the load-structure method; however, the role of high-density polyethylene (HDPE) conduits and the thresholds of electrical duct banks has not been fully scrutinized. This study examines the bending behaviors of electrical duct banks subjected to monotonic vertical loading in a soil box using an advanced monitoring device to measure the conduit diameter change. An analysis of the experiment shows the effective role of HDPE conduits in improving the bending capacity of electrical duct banks. The results suggest 5% and 7.5% as the deformation rate thresholds with respect to the ultimate states of serviceability and bearing capacity, respectively. The threshold of the longitudinal curvature radius is determined to be 18000 m. Finally, the evolution trends of the stress and deformation rates of HDPE conduits are recommended for the monitoring indexes and control standards of electrical duct banks.
Highlights
IntroductionUnderground cables, and substations are critical infrastructure components in electricity transmission
Overhead lines, underground cables, and substations are critical infrastructure components in electricity transmission
Electrical cables are typically laid out within polyvinyl chloride (PVC)/modified polypropylene (MPP)/high-density polyethylene (HDPE) conduits that are bundled together. ese groupings of conduits are often protected by concrete casings
Summary
Underground cables, and substations are critical infrastructure components in electricity transmission. In London, most of the electricity supply is transmitted via underground cables, which are traditionally found just below the road surface [2]. High-voltage underground cables are laid in a duct bank rather than being buried directly in the ground. Electrical cables are typically laid out within polyvinyl chloride (PVC)/modified polypropylene (MPP)/high-density polyethylene (HDPE) conduits that are bundled together. Ese groupings of conduits are often protected by concrete casings. All concrete-encased electric conduit duct banks contain steel reinforcement throughout their entire length. E reinforcing steel is installed longitudinally at each corner of a duct bank (in cross section) and along the top and bottom. Stirrups are needed to hold the longitudinal steel in place during the placement of the concrete
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