This geometric shape bridge is more difficult in both design and construction.

• A. Curved Bridges
• B. Straight Bridges
• C. Skewed Bridges
• D. Highway Bridge

Answer: (A)

Curved bridges are more challenging because the deck follows a changing path, not a straight line. That curvature makes the direction of internal forces rotate along the span, so bending moments, shear, and especially torsional effects vary around the curve. Analyzing and detailing these varying forces requires more advanced methods (often curved-beam or finite-element analysis) and careful reinforcement layout to ensure the load paths stay continuous and safe as the geometry changes.

Construction follows the same logic in practice. Aligning girders, decks, and supports to a continuous curve is harder than lining up straight elements. Formwork and falsework must adapt to the curved path, bearings and joints must accommodate changing rotations and displacements, and transitions between straight and curved sections demand precise geometry to avoid abrupt changes in behavior. On curves, design must also account for vehicle dynamics, such as lateral acceleration and superelevation, which influence load demands and detailing.

While straight bridges are simpler to model and build because the loading and geometry remain constant along the span, and skewed or highway classifications introduce their own challenges, the intrinsic complexity of a changing curved geometry makes this type inherently more difficult in both design and construction.