CE-702-D Structural Design and Drawing (RCC-II) - Nov 2023 Question Paper

Under each question, How to answer lists the points an answer should cover, outlined by CampusPrep from the syllabus. Check the details against your textbook.

1. 14 Marks
   What do you understand by sway and non sway buildings? Explain clearly.
   How to answer

   • Define sway vs non-sway (sidesway) buildings per IS:456.
   • Explain effective length and stability criteria.
   • Discuss bracing / shear walls role with examples.
2. 14 Marks
   What do you understand by Retaining walls? Why it is provided? Also explain cantilever retaining wall.
   How to answer

   • Define retaining wall and its purpose.
   • Explain need: retain earth, prevent sliding/overturning.
   • Describe cantilever retaining wall components and action with diagram.
3. 14 Marks
   Design a stem of a cantilever retaining wall, retaining levelled earth $5.4 \text{m}$ above base level. Take the density of soil is $16 \text{kN/m}^3$, angle of repose is $30^\circ$, base width $4 \text{m}$, toe projection $1.0 \text{m}$ and thickness of base slab $0.4 \text{m}$.
   How to answer

   • Compute Ka for phi=30 deg and earth pressure distribution.
   • Calculate bending moment and shear at base of stem.
   • Design stem section and reinforcement and check shear.
   • Detail curtailment and provide sketch.
4. 14 Marks
   Design and detail the wall of a circular water tank of $200 \text{ kL}$ capacity having rigid wall and base connections. Maximum depth of water is limited to $3.2 \text{m}$.
   How to answer

   • Determine tank diameter from 200 kL capacity and 3.2 m depth.
   • Analyse hoop tension and cantilever moment for rigid base.
   • Design wall thickness and steel for combined action.
   • Detail vertical and hoop reinforcement.
5. 14 Marks
   Design top dome, top ring beam and cylindrical wall of an intze tank of capacity $1000 \text{ kL}$ litres. Use M30 grade of concrete and steel of grade Fe 415.
   How to answer

   • Fix Intze tank geometry for 1000 kL capacity.
   • Design top dome for membrane stresses.
   • Design top ring beam for hoop tension.
   • Design cylindrical wall for hoop tension and detailing.
6. 14 Marks
   Design the side wall of silo to store coal. Diameter of silo is $6 \text{m}$, height of cylindrical wall is $16 \text{ m}$, unit weight of coal $8.5 \text{kN/m}^3$, $\mu = 0.22$ and coefficient of friction is $0.4$. Sketch the details.
   How to answer

   • Compute lateral pressure by Janssen / Airy theory using mu and friction.
   • Determine hoop tension variation with depth.
   • Design wall thickness and hoop steel.
   • Sketch wall section with reinforcement details.
7. 14 Marks
   What do you understand by Pre-stressing? Also discuss its advantages and disadvantages.
   How to answer

   • Define pre-stressing and principle of pre-compression.
   • Explain pre-tensioning vs post-tensioning.
   • List advantages e.g. crack-free, longer spans.
   • List disadvantages e.g. cost, skilled labour.
8. 14 Marks
   Design a solid slab bridge for class AA loading for the following data: Clear span = $8.0 \text{m}$ Clear width of road ways = $7.5 \text{m}$ Average thickness of wearing coat = $80 \text{mm}$
   How to answer

   • Compute effective span, dead load and live load for Class AA.
   • Calculate design bending moment and shear with impact.
   • Design slab thickness and main/distribution steel.
   • Check shear and detail reinforcement.