SPPU Civil Engineering (Semester 6)
Structural Design II
May 2017
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


Solve any one question from Q.1(a,b) &Q.2
1(a) Draw strain and stress s distribution diagrams with all parameters for the design of RCC section of flexural member using LSM.
3 M
1(b) Draw stress strain curves for concrete in LSM and explain stress and strain values associated with the curves.
3 M

2 Explain the terms bond stress and development length. Calculate development length for 20mm diameter bar in compression and tension by both methods (WSM and LSM). Use M25 concrete and Fe 500 steel.
6 M

Solve any one question from Q.3 &Q.4
3 A Calculate the moment of resistance by LSM for flanged beam section detailed as below
a) Width of rib = 230 mm
b) Effective flange width = 1600mm
c) Thickness of flange = 125 mm
d) Effective depth = 565 mm
e) Tension steel = 2-#20 through plus 2-#16 curtail at midspan.
f) Use M20 grade of concrete and Fe 500 grade of steel
8 M

4 A rectangular beam section, 230mm wide and effecitve depth 415mm is reinforced with 4 bars of 20mm diameter in the tensile zone 2 bars of 20mm in the compression zone. Determine moment of resistance of the section using WSM, Use M20 grade of concrete and Fe 415 grade of steel.
8 M

Solve any one question from Q.5 &Q.6
5 Design a cantilever slab for effective span 1.5m subjected to floor finish of 2kN/m2 and live load 3kN/m2. Use Concrete of grade M20 and Fe 500 reinforcement. Draw details of reinforcement. Check for shear is not required. ( Use LSM)
8 M

6 Design a simply supported slab for a room with clear inner size 3.2m×7.8m. The slab is supported by beams of width 230mm along all the edges. The slab is subjected to floor finish of 1kN/m2 and live load 4kN/m2. Use Concrete of grade M20 and Fe 500 reinforcement. Draw details of reinforcement. Check for shear is not required. (USE LSM)
8 M

Solve any one question from Q.7 &Q.8
7 Continuous RC beam ABCD of reactangular section is simply supported at A and D and continuous over support B and C. Span AB = 5.0m, BC= 7.0m and CD= 6.0m. The beam carries dead load of 24kN/m (including its self weight) and live load 20kN/m. The beam supports 120 mm slab on both sides. Calculate design moment for span BC after 20% redistribution of moments by considering proper load case. Design BC for flexure and shear. Draw the reinforcement details. Material- Concrete of grade M30, Fe 500 reinforcement.
16 M

8 Design a continous beam ABCD for flexure only using IS code coefficients. AB=BC=CD=4.2m. The beam supports 120mm slab on both sides. The beam carries dead load of 20kN/m (including its self weight) and live load of 10kN/m. Take material M30 and Fe 500. Show the reinforcement detail in longitudinal section and cross-section at continuous support and at mid span.
16 M

Solve any one question from Q.9 &Q.10
9 A rectangular RC beam of span 6m, size 300mm×600mm with effective cover 40 mm is subjected to following actions:
a) Factored BM = 100kN.m
b) Factored SF = 70kN
c) Factored Torsional Moment = 40kN.m
Design the beam for flexure and shear using M25 &Fe 500 grade materials.
16 M

10 Design an axially loaded short column to carry a working load of 80kN. The unsupported length of column is 3.5. The column is held in position and and not restrained against the rotation at both ends. Also design the footing for this column only for flexure and one way shear. Take SBC = 200kN/m2. Material M20 and and Fe = 500 used. Show detailed load and design calculations and reinforcement details in plan and sectional elevation.
16 M

Solve any one question from Q.11 &Q.12
11 Design a bi-axial rectangular short column by limit state method with material M25 and Fe 415 to carry a working load of 1100kN. Working moment of 120 kn-m about major axis bisecting the depth of column and 40 kN-m about minor axis bisecting the width of column. The unsupported length of column about major and minor axis is 3.6m and 3.2m. The coulmn is fixed at one end and hinged at the other. Show detailed design calculations and reinforcement details.
16 M

12 Design an unaxial square short column by limit state method with material M25 and Fe 500 to carry ultimate load of 800 kN and working moment of 80 kN-m about major axis bisecting the depth of coulmn. The unsupported length of coulmn is 3.6m. The column is fixed at one end hinged at the other. Also design the footing for his coulmn only for flexure and punching shear. Take SBC = 250 kN/m2. Show detailed design calculations and reinforcement details in plan and sectional elevation.
16 M



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