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1Example 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/m2, a snow load of 1.6 kN/m2, and a superimposed dead load of 1.44 kN/m2. The roof slab is supported on all sides by stiff beams or masonry block walls. Given: fy=400MPa , fc’=25 MPa Solution: Step 1: Check stiff supportStiff support requires 33n/2.0wsbb hl h≥Here it is given that the slab is supported by stiff support. OK Step 2: Select Slab thicknessDeflection requirements (Cl.13.2.5 and Appendix B.3.1) Corner A -B-1-2 (S1) governs: β= 6000/5200=1.15; and assumemα=2.0 (Cl.13.2.5) hs= βαmynfl430)1000/6.0(++= 15.1*2*430)1000/4006.0(6000++= 153 mm (B.3.1) min2(60005200)160140140sperimeterhmm×+===Try hs= 160mm.
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