Two-way_slab_with_stiff_support

Two-way_slab_with_stiff_support - Example on Two-way Slab...

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1 Example on Two-way Slab with Stiff Supports: Figure 1: Plan of the floor The roof of a storage facility supports a live load of 2.4 kN/m 2 , a snow load of 1.6 kN/m 2 , and a superimposed dead load of 1.44 kN/m 2 . The roof slab is supported on all sides by stiff beams or masonry block walls. Given: f y =400MPa , f c =25 MPa Solution: Step 1 : Check stiff support Stiff support requires 33 n /2 . 0 ws b bh lh Here it is given that the slab is supported by stiff support. OK Step 2 : Select Slab thickness Deflection requirements (Cl.13.2.5 and Appendix B.3.1) Corner A -B-1-2 (S1) governs: β = 6000/5200=1.15; and assume m α =2.0 (Cl.13.2.5) h s = m y n f l 4 30 ) 1000 / 6 . 0 ( + + = 15 . 1 * 2 * 4 30 ) 1000 / 400 6 . 0 ( 6000 + + = 153 mm (B.3.1) min 2 (6000 5200) 160 140 140 s perimeter hm m × + == = Try h s = 160mm.
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2 5500 5200 6300 6000 1m strip dv Step 3 : check shear in slab (see Fig-2) * Loading (Annex C), load combination 2 *Assume 25 mm cover and No. 15 bars d = 160-25-15 = 120 mm d v = 0.9 d = 108mm or = 0.72hs =115.2 mm , choose d v =115 mm * Cl 13.3.6.2 115 * 1000 * 25 * 21 . 0 * 1 * 65 . 0 ' = = bd f V c c r λβ φ = 78.5 kN V f = w f x (l n /2 . d v ) x 1 = 11 x (2.6 * 0.115) x 1 = 27.3 kN < V r OK Step 4 : Design moments Panel S1: Middle strip / 5200/ 6000 0.85 ab ll =≈ , * Negative moment at continuous edge (B.3.4): From Table B.1 (case 4): C
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This note was uploaded on 03/10/2009 for the course ENGR BCEE 345 taught by Professor Drgala during the Winter '07 term at Concordia Canada.

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Two-way_slab_with_stiff_support - Example on Two-way Slab...

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