4.8 Refer to the following table from ACI Code to determine the maximum spans or minimum thickness for the multi-span one-way slabs shown the following questions. RECESS 2%* AT BALCONY EDGE TABLE 9.5(a) - MINIMUM THICKNESS OF NONPRESTRESSED BEAMS OR ONE-WAY SLABS UNLESS DEFLECTIONS ARE CALCULATED Member Solid one- way slabs SPAN? CANTILEVER Beams or ribbed one- way slabs Minimum thickness, h One end Both ends Simply supported continuous continuous Cantilever Members not supporting or attached to partitions or other construction likely to be damaged by large deflections 1/20 U24 0728 1/10 4/16 /18.5 021 Notes: Values given shall be used directly for members with normalweight concrete and Grade 60 reinforcement. For other conditions, the values shall be modified as follows: a. Choose a uniform slab thickness for all spans in the following diagram. At the cantilevered balcony, keep the same bottom of slab level for ease of formwork. o pa po 7.4' 26:0 48 For lightweight concrete having equilibrium density, w in the range of 90 to 115 Evt. the values shall be multiplied by (1.65 -0.005w) but not less than 1.09. b) For other than 00,000 psi, the values shall be multiplied by (0.4+/100.000) 30-0 SPAN ? INTERIOR-BAY BM WIDTH 16 TYP 28/0 b. Determine the maximum spans for end bays, interior bay and two cantilevers in the following figure. The slab is 9.5" thick at the interior and end bays. Bottom of slab is at a constant elevation at cantilevers and interior bays. SPAN ? END-BAY BM WIDTH 16" TYP RECESS 2 AT BALCONY EDGE 6-10 SPAN? END-BAY SPAN? CANTILEVER
4.8 Refer to the following table from ACI Code to determine the maximum spans or minimum thickness for the multi-span one-way slabs shown the following questions. RECESS 2%* AT BALCONY EDGE TABLE 9.5(a) - MINIMUM THICKNESS OF NONPRESTRESSED BEAMS OR ONE-WAY SLABS UNLESS DEFLECTIONS ARE CALCULATED Member Solid one- way slabs SPAN? CANTILEVER Beams or ribbed one- way slabs Minimum thickness, h One end Both ends Simply supported continuous continuous Cantilever Members not supporting or attached to partitions or other construction likely to be damaged by large deflections 1/20 U24 0728 1/10 4/16 /18.5 021 Notes: Values given shall be used directly for members with normalweight concrete and Grade 60 reinforcement. For other conditions, the values shall be modified as follows: a. Choose a uniform slab thickness for all spans in the following diagram. At the cantilevered balcony, keep the same bottom of slab level for ease of formwork. o pa po 7.4' 26:0 48 For lightweight concrete having equilibrium density, w in the range of 90 to 115 Evt. the values shall be multiplied by (1.65 -0.005w) but not less than 1.09. b) For other than 00,000 psi, the values shall be multiplied by (0.4+/100.000) 30-0 SPAN ? INTERIOR-BAY BM WIDTH 16 TYP 28/0 b. Determine the maximum spans for end bays, interior bay and two cantilevers in the following figure. The slab is 9.5" thick at the interior and end bays. Bottom of slab is at a constant elevation at cantilevers and interior bays. SPAN ? END-BAY BM WIDTH 16" TYP RECESS 2 AT BALCONY EDGE 6-10 SPAN? END-BAY SPAN? CANTILEVER
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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