Design of Reinforced Concrete structures — Summer 2022

Explain Philosophy of Earthquake resistant design. Give four virtue of good earthquake resistant design.

Mention the ductile detailing criteria for flexural members as per IS 13920.

A G+7 multistoried unbraced frame building of 30 m height is having a plan dimension 20m X 30m, having bay width 5 m in both direction. Take Ground floor height as 5 m and all other floor height is 4 m. Take parapet height 1m. The location of building is in “Vadodara” city of Gujarat state with the terrain category III. The upwind slope is less than 3˚, Take plinth is at 1m above G.Lhaving no plinth beams but consider beams at 1m below G.Land footings are provided at 2 m below G.L. Assume overall depth of all beams = 500 mm and slab thickness 150 mm. Consider Design life of building as 100 years. Compute wind loads acting on an internal frame at node points and plot wind pressure diagram as per provisions of IS: 875(Part-III).

State the guide lines for preparation of structural layout for building

Prepare structural layout and nominate all the members like slabs, beams, columns of G+3 building (whole structure) of having 4 bays of 5 m in X –direction and 4 bays of m in Y-direction.

Enlist different types of slab form in of above layout Q.2 (b) and Design any one slab panel with reinforced details.

Estimate the load on the Continues beam of span 5 m of above example Q.2 (b) and design it.

The cantilever retaining wall has to retain the earth with a horizontal top 4 m above ground level. Density of earth is 17 kN/m3. Angle of internal friction ϕ is 30˚. SBC of soil is 150 kN/m2. Coefficient of friction μ is 0.55. Determine dimensions of the retaining wall. Use M20 grade of concrete and Fe 415 grade of steel.

For problem 3 (a) above, check the stability of wall.

For problem 3 (a) above, design Stem and draw diagram showing reinforcement details.

The counter fort retaining wall has to retain the earth with a horizontal top 6 m above ground level. Density of earth is 16.2 kN/m3. Angle of internal friction ϕ is 30˚. SBC of soil is 150 kN/m2. Coefficient of friction μ is 0.6. Determine dimensions of the retaining wall. Use M20 grade of concrete and Fe 415 grade of steel.

For problem 3 (a) above, check the stability of wall.

For problem 3 (a) above, design stem and draw diagram showing reinforcement details.

Explain the Various types of joints can use in water tanks. with necessary sketches

Fix the basic dimension of rectangular underground tank of capacity 68,000 liters and find the design constants. Use M30 concrete and Fe415 grade steel. Take saturate unit weight of soil 18 kN/m3 and Φ = 30˚.1

Design long wall of water tank and furnish reinforcement Detailing for above Q.4(b)

Fix the basic dimensions of Intze type container of an elevated water tank to store laces liter of water. Height of staging =15m up to bottom of tank, wind load = 1.5 KN/m2 throughout the height. Use M30 grade concrete and Fe 415 grade steel.

For Q-4 (a) above, Design and detail top dome.

For Q-4 (a) above, Design top ring beam and cylindrical wall.

Describe advantages and disadvantages of Flat slab.

Explain the codal provision of Direct Design Method for flat slab.

Design an interior panel of flat slab having equal panels of 5m × 5m. The internal columns are 500 mm in diameter and column head is 1000 mm in diameter. The storey height above and below slab is 4m. Design the flat slab with drop and column head. Live load 4 kN/m2. M-20 concrete and Fe-415 steel.

Explain ductile detailing of column as per IS: 13920 with sketch.

Explain the ‘Strong column-Weak beam’ design concept.

Calculate base shear for the five storey RC frame building (Office Building) has size 30 m X 30 m located in Bhuj, using seismic coefficient method for following data: Type of soil = Hard, the weight of the floors and height of the floors are 2000 kN, 2500 kN, 2500 kN, 2500 kN and 2100 kN respectively, and 4.5 m, 3.5 m, 3.5 m, 3.5 m, 3.5 m respectively from, slab no.1 from bottom. Also determine the seismic forces and shears at each floor level.