A Study of Analysis for Load Bearing Behavior and Designing a Skew Bridge in the Case of a Skew 50 Degrees

Abstract

Currently, extensive bridge construction is underway, and a major challenge encountered in such projects is the presence of immovable obstacles, To address these challenges, skew bridges are constructed to circumvent these obstacles. The Department of Highways has established standard bridge designs capable of accommodating skew angles ranging from 0 to 45 degrees (Department of Highways, 2015), which poses limitations on bridge design in certain areas. This research study examines the load-bearing behavior of a 50-degree skew and designs a skew bridge by investigating the design of reinforced concrete plank girders with a span length of 10 meters. It also encompasses the design of cross beams and abutment piles. Analyze using SAP 2000 and CSI Bridge software to analyze the structure, both in cases of no skew and skew angles of 45 degrees. To compare with the standard design. Then, study and analyze the Skew angle of 50 degrees. The results revealed that the mid-span positive moment decreases and approaches the skew angle, while there is an increase in a negative moment at the skew angle. Additionally, the maximum shear force increases, reaching its peak at the skew angle, and then gradually decreases. This occurs in a non-linear manner, diverging from the supported standard design. Furthermore, there is an increase in the maximum deflection nearing the skew angle. The researchers have designed plank girders, cross beams, and abutment piles to be utilized in bridge construction for a 50-degree skew angle. It also demonstrates the increased use of special reinforcing bars and wires in the design.