CE-702-D Structural Design and Drawing (RCC-II) - Jun 2025 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
   Design a cantilever retaining wall to retain earth embankment $4\text{ m}$ height above ground level the density of earth is $18\text{ kN/m}^3$ and its angle of repose is $30^{\circ}$. The embankment is horizontal at its top. The safe bearing capacity of the soil may be taken as $200\text{ kN/m}^2$ and the coefficient of friction between soil and concrete is $0.5$. Adopt M20 grade concrete and Fe415 HYSD bars.
   How to answer

   • Assume total height including base and proportion base width for stability
   • Check overturning, sliding and base pressure against SBC 200 kN/m2
   • Design stem, toe and heel for bending moment and shear with M20/Fe415
   • Detail reinforcement and provide neat sketch
2. 14 Marks
   A circular water tank, resting on yielding ground, has a capacity of 4,00,000 liters. The total height of the tank wall is limited to $3.5\text{m}$. the free board is $200\text{ mm}$. the wall and the base slab are cast integrally. Design the tank including the roof dome using M20 grade concrete and Fe415 type steel.
   How to answer

   • Determine tank diameter from capacity 400000 litres and water depth 3.3 m
   • Design wall for hoop tension and cantilever moment with integral base
   • Design base slab and spherical roof dome with ring beam
   • Detail reinforcement and sketches
3. 14 Marks
   A pretensioned concrete beam of width $200\text{ mm}$ and depth $450\text{ mm}$ is prestressed with $300\text{ mm}^2$ of steel located at $100\text{ mm}$ from the soffit of the beam. The wires are initially tensioned to $1000\text{ N/mm}^2$. The span of the beam is $10\text{ m}$. Calculate the loss of prestress, if loss due to relaxation of steel is $50\text{ N/mm}^2$. Shrinkage of concrete is $300 \times 10^{-6}$, creep coefficient $= 1.6$, $E_s = 200\text{ kN/mm}^2$ and $E_c = 31.5\text{ kN/mm}^2$.
   How to answer

   • Calculate concrete stress at steel level due to prestress
   • Compute elastic shortening loss using modular ratio Es/Ec
   • Add shrinkage loss Es * epsilon_sh and creep loss
   • Add given relaxation loss 50 N/mm2 for total loss
4. 14 Marks
   Design a circular steel silo of $10\text{ m}$ height and $4\text{ m}$ internal diameter to store cement of unit weight $15.50\text{ kN/m}^3$ and $\phi = 25^{\circ}$. Assume the suitable data.
   How to answer

   • Compute lateral pressure by Janssen/Airy theory for cement phi=25 deg
   • Determine hoop tension variation with depth and plate thickness
   • Design cylindrical shell, roof and hopper/bottom
   • Assume suitable steel grade, joints and stiffeners
5. 7 Marks
   aExplain why cylindrical shapes are preferred for silos.
   How to answer

   • Define silo hoop action vs bending in rectangular bins
   • Explain uniform pressure and no stress concentration
   • Mention economy, construction and flow advantages
6. 7 Marks
   bDiscuss various factors to be considered for determination of the general dimension of the rectangular shear walls.
   How to answer

   • List aspect ratio, height, openings and stiffness needs
   • Discuss lateral load, shear lag and boundary elements
   • Mention architectural, foundation and ductility factors
7. 7 Marks
   aDiscuss the IRC loading standards for highway bridge design.
   How to answer

   • List IRC Class AA, A, B and 70R loadings
   • Explain impact, lane and axle arrangement
   • Relate to highway bridge span and design forces
8. 7 Marks
   bDiscuss the design considerations of earth pressure for retaining walls.
   How to answer

   • Distinguish active, passive and at-rest pressure
   • Explain Rankine/Coulomb, surcharge, water table effects
   • Mention stability and drainage considerations
9. 14 Marks
   A continuous T beam has the cross-sectional dimensions shown in figure below. The web dimensions have been determined from the consideration of negative moment at support and shear strength requirements. The span is $10\text{ m}$ and the design moment at midspan under factored loads is $800\text{ kN-m}$. Determine the flexural reinforcement at midspan. Consider M20 concrete and Fe415 steel. Assume that the beam is subjected to a moderate exposure condition.

   

   How to answer

   • Check effective flange width and neutral axis for Mu=800 kN-m
   • Determine if section is under-reinforced T-beam
   • Calculate Ast using limit state formula for M20/Fe415
   • Check minimum steel and moderate exposure cover
10. 14 Marks
    Write short note on any four of the following:

    1. a)Types of prestressing
    2. b)Sway and non-Sway buildings
    3. c)Counterfort retaining walls
    4. d)Types of silos
    5. e)Bridge girder
    How to answer

    • Define each term with key features and sketches
    • Give types, behaviour and applications
    • Cover any four: prestressing, sway, counterfort, silos, girder