Research Articles | Challenge Journal of Concrete Research Letters

Finite Element and Modal Analysis of 3D Jointless Skewed RC Box Girder Bridge

Mahmoud Shaaban Sayed Ahmed


The principal modes (normal modes) of vibration for a multi-degree-of-freedom (MDOF) system are used to generalize the 3D coordinates of the two-span skewed, haunched and jointless reinforced concrete box girder bridge, and to define the structural system response for the n-equations of uncoupled motion. Jointless bridges have many advantages over the conventional construction methods. It has long-term benefits in terms of serviceability, durability, construction cost and maintenance. However it has been limited for nonskewed and light-skewed bridges. The results of the finite element (FE) and modal analysis are presented to study the influence of the skew angle of 0, 15, 30, 45, 60 and 75 degrees on the natural frequency for the entire skewed bridge and the structural response for the superstructure covering moment, torsion, shear, axial load, deformation at the start and end abutment connection for the entire bridge section subjected to simulated two-perpendicular earthquake forces.


skewed box Girder Bridge; reinforced concrete; dynamics; modal analysis; earthquake

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