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VTU Civil Engineering (Semester 7)
Design of Masonry Structures
December 2016
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

1(a) Briefly explain the tests used to determine the compressive strength,
modulus of eleasticity and water absorption for masonry units.
8 M
1(b) Explain the causes for cracks in masonry also indicate the remedial measures to prevent cracks masonry.
8 M
1(c) Briefly explain classification of mortar.
4 M

2(a) Briefly explain various factors influencing the strength of masonry.
10 M
2(b) Discuss strength formulae and mechnism of failure of masonry subjected to direct compression based on elastic theory.
10 M

3(a) With neat sketches explain various types of walls and their functioning.
8 M
3(b) Derive the expression for maximum and mminimum compressive stress induced in masonry due to eccentric loading.
6 M
3(c) Sketch the stress distribution diagrams for different eccentricity when e =0,
0 e =t/6, and e>t/6.
6 M

4(a) Write short notes on the following and indicate the values for different cases.
i) Effiective thickness
ii) Effective height
iii) Effective length
iv) Slenderness ratio.
10 M
4(b) For the cavity wall show in Fig.4(b) determine the effective thickness,
effective height,
stiffening co-efficient,
slenderness ratio and stress reduction factor. The wall is stiffened by by intersecting walls 200mm thick at 3600mm centre. The wall may be assumed to be fully restraint at top and bottom. Height from floor to floor is 3000mm. Eccentricity = zero.
!mage
10 M

5(a) Explain the design procedure of axially loaded walls.
5 M
5(b) Design an external cavity wall of a single storeyed building inner leaf of which supports an eccentric load of 7kN/m at an eccentricity of 25mm. The wall is equal to 4.0m. Refer FigQ5(b).
!mage
15 M

6(a) Explain the design criteria of wall with openings.
5 M
6(b) Design an interior solid wall of a two-storeyed bulilding with RCC slabs of effective span 2.65m. The wall is 3.6m long and is stiffened at the ends by 100mm thick intersecting walls as shown in Fig.Q6(b). The ceiling height of each floor is 3m. Thickness of floor (RCC) is 100mm. Thickness of Lime terrace 80mm. Live load on roof slab = 1.5kN/m2 and live load on floor = 2kN/m2. Floor finish load = 0.2kN/m2.
!mage
15 M

7(a) List out the steps involved in the design reinforced brick lintels.
6 M
7(b) Design an exterior solid wall of a single storey warehouse of 3.5m height. The loading on the wall consists of verticl load of 25kN/m from the roof and wind pressure of 860N/m2. The wall is tied with metal anchor at the floor and roof levels.
14 M

8(a) Explain different patterns of failure of infilled frames with neat sketches.
10 M
8(b) Design a shear wall 0.4m long and 3.5m high to resist a horiziontal earthquake force in its plane. Assume the seismic load to be uniformly distributed across the height of the wall. Earthquake acceleration =0.1g. The wall is tied with metal anchors at the top and bottom supports.
10 M

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