Concrete Bridges Superstructure

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Questions and Answers

In which type of bridge is the bending relatively reduced for intermediate spans?

  • Continuous bridge
  • Cantilever bridge (correct)
  • Pony Bridge
  • Simply supported bridge

What is the span range for which voided slab bridges can be economic?

  • Up to 40 m
  • Up to 25 m (correct)
  • Up to 20 m
  • Up to 15 m

What is the primary supporting condition for a box girder slab in concrete bridges?

  • Simply supported (correct)
  • Continuous bridge
  • Cantilever bridge
  • Semi deck Bridge

When is the web stiffener used in concrete bridges?

<p>When web depth is more than 2 m (A)</p> Signup and view all the answers

What is the purpose of a ribbed slab in concrete bridges?

<p>Lower self weight compared to solid slab (A)</p> Signup and view all the answers

What is the purpose of web stiffeners in steel bridges?

<p>To prevent buckling of the web under compression load (B)</p> Signup and view all the answers

What is the primary function of longitudinal stiffeners in steel bridges?

<p>To prevent buckling of the web for taller main girders (C)</p> Signup and view all the answers

What is the purpose of bracing in steel bridges?

<p>To resist horizontal loads and ensure bridge stability (A)</p> Signup and view all the answers

Where are transverse stiffeners typically placed in steel bridges?

<p>1.5 to 1.8 m apart for main girders above 1 m in height (A)</p> Signup and view all the answers

What should be considered during three stages for evaluating the impact of wind on a bridge structure?

<p>Construction, after construction, and after loading (A)</p> Signup and view all the answers

Which factor has the most significant influence on the dynamic behaviour of a bridge?

<p>Dynamic amplification (D)</p> Signup and view all the answers

What is the function of vertical bracing in steel bridges?

<p>To connect the upper horizontal bracing with lower horizontal bracing and bearings (C)</p> Signup and view all the answers

What mainly causes horizontal forces on a bridge?

<p>Braking and accelerating of vehicles (C)</p> Signup and view all the answers

What is the primary factor affecting the overall deformations (lengthening or shortening, curvature) of a bridge?

<p>Temperature change (B)</p> Signup and view all the answers

What influences the load values on a bridge?

<p>Distribution of loads and vehicle natural frequencies (A)</p> Signup and view all the answers

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