A COMPARATIVE STUDY OF THE BENDING MOMENTS ANALYSIS FOR THE CROSS GIRDER IN A TWO-LANE TWO-WAY HIGHWAY BRIDGE UNDER ACTUAL TRAFFIC AXLE WEIGHTS AND THE EGYPTIAN DESIGN LOAD STANDARDS.

Document Type : Original Article

Authors

Al Azhar University, Faculty of Engineering, Civil Eng. Dept., Cairo, Egypt.

10.21608/auej.2024.269571.1624

Abstract

In many countries, including Egypt (ECP 201-2012), bridges are designed based on international codes such as AASHTO and EN 1991-2:2003 specifications. The Egyptian code for vehicle loads on bridges is based on the Eurocode (EN 1991-2:2003). However, local trucks often exceed these specified design truckloads, increasing the probability of damage, shortened service life, and potential bridge failure. This study evaluates the bending moments for the cross girder of a two-lane, two-way highway bridge under various loading conditions. Site surveillance collected data on actual traffic parameters, including axle weights, vehicle weights, headway distances, vehicle types, axle spacing, and vehicle speeds. The study utilized the Monte Carlo Simulation technique, a MATLAB algorithm, and the finite element method via SAP2000 to model different loading scenarios and the probability of lane occupation for span lengths ranging from 20 meters to 80 meters. The analysis of gross vehicle weight data found that 42.7% of the heavy trucks examined exceeded the GARBLT weight limitations. Furthermore, the highest axle overload factor observed was 2.7. These findings highlight the significant risk that overloaded trucks pose to bridge strength and safety. The resulting bending moments were then compared with the Egyptian design load standards. The findings of this study will contribute to developing a more accurate and reliable method for evaluating bridge loads, significantly enhancing the safety and reliability of highway bridges in Egypt.
 
 
Special Issue of AEIC 2024 (Civil Engineering  Session)

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Journal of Al-Azhar University Engineering Sector
Volume 19, Issue 72
Special Issue for Al-Azhar Engineering 16th. International Conference (AEIC 2024)
July 2024
Pages 323-337

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