International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 06 | Jun 2025
p-ISSN: 2395-0072
www.irjet.net
IMPROVEMENT IN THE CROSS SECTION OF PSC ELECTRIC POLE FROM RECTANGULAR TO SQUARE CROSS SECTION Irshad Ansari1, Mohit kashyap2, Pradeep Kumar Gurjar3, Vicky 4 , Alok Verma5 1,2,3,4Student, Dept. of Civil Engineering, Delhi Technological University, Delhi, India 5Professor, Dept. of Civil Engineering, Delhi Technological University, Delhi, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - This paper presents a comparative study on
reinforcement in that direction, resulted in the pole fracturing at the base. The failure caused operational delays, increased maintenance costs, and exposed safety hazards.
the performance of Prestressed Concrete (PSC) electric poles at Corner of street/road with rectangular and square crosssections. Aimed at improving structural integrity, safety, and cost-efficiency, the study analyses key parameters such as load-bearing capacity, crack resistance, deflection, installation practicality, and overall economic feasibility. Field observations, analytical calculations, and experimental testing confirm that square cross-section poles offer improved load distribution, reduced torsional instability, and easier maintenance. The transition to square sections demonstrates enhanced performance under various loading conditions, particularly at critical installations such as 90° turns in power lines. STAAD Pro-based modeling, IS code design compliance, and cost comparison further validate the advantages of adopting the square crosssection in PSC pole design.
1.3 Structural Loading Conditions The corner pole, generally designed with a rectangular cross-section, experienced an unanticipated combination of dynamic forces during the cable replacement/ Stringing. These included:
Key Words: PSC Pole, Rectangular Cross-section, Square Cross-section, Load-bearing, Crack Resistance, Cost Efficiency, STAAD Pro
1.INTRODUCTION Pre-Stressed Concrete (PSC) poles are widely used in power transmission and distribution systems due to their high strength-to-weight ratio and resistance to environmental stresses. Traditional PSC poles are often constructed with a rectangular cross-section, which provides directional strength but suffers from structural inefficiencies when subjected to multidirectional forces, particularly at line corners. this study proposes the adoption of square cross-sections in PSC poles to address these inefficiencies. Square poles offer uniform structural stiffness and strength along both axes, improving overall stability and performance. The goal is to validate the superiority of square designs through analytical comparison, field testing, and cost analysis.
Fig: Diagram Showing Placement of Pole and its Installation Tensile force from the new conductor being tensioned along the line. Concentrated load from the lineman’s weight, applied at a localized point via the ladder. Bending and torsional moments resulting from asymmetrical load distribution, exacerbated by the sharp turn in the line and the absence of counteracting forces from other cables. These factors led to a critical stress condition in the pole, particularly in the direction of the line, exposing its structural vulnerability. To Counter these forces, conventional practice involves installing two rectangular poles (a main pole and an auxiliary/support pole).
1.2 Failure Mechanism The combined effect of axial, lateral, and torsional forces exceeded the moment capacity of the rectangular pole’s cross-section. The design’s inherent weakness along the minor axis, compounded by the lack of prestressed
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