# Design of Structural Masonry

## W. M. C. McKenzie

Language: English

Pages: 278

ISBN: B019TM4HEE

Format: PDF / Kindle (mobi) / ePub

"Design of Structural Masonry" provides a comprehensive source of information on practical masonry design, introduces the nature and inherent characteristics of masonry given in relation to the requirements of BS 5628 and introduces the use of Eurocode EC6 in structural masonry design. The book's content ranges from an introduction to masonry as a material to the design of realistic structures.

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block can then be determined in terms of the design eccentricity. i.e. length of stress block = x = 2(t/2 – em ) = (t – 2em ) design load /unit length = (area × stress) = [(t – 2em ) × 1.0] × [1.1fk/γm ] This load must also be equal to the expression given in the code, i.e. ∴ β t fk γm ∴ β β t fk γm = [(t – 2em ) × 1.0] × [1.1fk/γm ] = 1.1[1 – (2em /t)] This equation has been used to calculate the values given for β in Table 7 of the code. Note: It is important to note that em is a

values given in Tables 2(b) and (c). aspect ratio of concrete block = Axially Loaded Walls Contract : Warehouse Job Ref. No. : Example 2.7 Part of Structure : Masonry Walls Calc. Sheet No. : 5 of 10 References 95 Calcs. by : W.McK. Checked by : Date : Calculations Tables 2(b) & (c) Assume the compressive strength of the unit is 3.5 N/mm2 then for any mortar designation (i) to (iv): 0.6 ⎤ ⎡ fk = ⎢1.7 + (3.5 − 1.7 )× = 2.47 N/mm2 > 2.08 N/mm2 1 .4 ⎥⎦ ⎣ Adopt concrete blocks with unit

padstone Concrete column on spreader beam concrete spreader beam Figure 2.49 104 Design of Structural Masonry Three types of bearing are considered in Figure 5 of the code and are illustrated in Table 2.7 and Table 2.8 in this text. Bearing Type 1 x y z Local Design Strength ≥½t ≤3t 1.25 f k γm ≥½t ≤2t 1.25 f k γm ≥ 50 mm ≤½t No restriction Edge distance may be zero 1.25 f k γm ≤6x Edge distance ≥ x 1.25 f k γm y x t y x t y x z t y x z >½t ≤t t Table 2.7

Sizes of Precast Concrete Blocks 390 440 440 440 440 590 190 140 190 215 290 140 * * * * * * * * * * * * * * * * * * * * * * * * * * * Figure 1.6 * * * * * * * * * * * * * * * * * * * * * * 590 190 590 215 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 6 Design of Structural Masonry Work Sizes of Precast Concrete Bricks Length - mm 290 215 190 190 Height - mm 90 65 90 65 Thickness - mm 90 * * * 103 * Figure 1.7 1.2.2 Mortar: (Clause 15) Mortar is the medium

designed on the basis of tension reinforcement providing the whole of the tensile force calculated assuming a lever arm equal to two-thirds of the depth, with a maximum value equal to (0.7 × span), as indicated in Clause 8.2.4.2.2 of the code and in Figure 4.6. d Area of steel As = As Span = L Lever-arm = 0.67d ≤ 0.7L Figure 4.6 (f (M × γ ms ) y × lever arm where M is the applied bending moment ) 188 Design of Structural Masonry The design formulae (based on a rectangular stress