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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 2¹ 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 0/20 1/24 1/28 1/10 #16 1/18.5 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. 26:0 SPAN? END-BAY 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) For lightweight concrete having equilibrium density in the range of 90 to 115 6, the values shall be multiplied by (1.65-0.005) but not less han 1.09. b) For other than 60,000 psi, the values shall be multiplied by (0.4+1/100,000) 1/21 30.0 BM WIDTH 16 TYP 28-0 DM WIDTH 16' TYP 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? INTERIOR BAY RECESS 2 AT BALCONY EDGE 6-10 1 SPAN? END-BAY SPAN? LEVER

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 2¹ 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 0/20 1/24 1/28 1/10 #16 1/18.5 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. 26:0 SPAN? END-BAY 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) For lightweight concrete having equilibrium density in the range of 90 to 115 6, the values shall be multiplied by (1.65-0.005) but not less han 1.09. b) For other than 60,000 psi, the values shall be multiplied by (0.4+1/100,000) 1/21 30.0 BM WIDTH 16 TYP 28-0 DM WIDTH 16' TYP 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? INTERIOR BAY RECESS 2 AT BALCONY EDGE 6-10 1 SPAN? END-BAY SPAN? LEVER

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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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 2¹ 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 0/20 1/24 1/28 1/10 #16 1/18.5 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. 26:0 SPAN? END-BAY 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) For lightweight concrete having equilibrium density in the range of 90 to 115 6, the values shall be multiplied by (1.65-0005w,) but not less han 1.09. b) For other than 60,000 psi, the values shall be multiplied by (0.4+1/100,000) 1/21 30.0 BM WIDTH 16 TYP 28-0 DM WIDTH 16' TYP 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? INTERIOR BAY RECESS 2 AT BALCONY EDGE 6-10 1 SPAN? END-BAY SPAN? LEVER
Transcribed Image Text: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 2¹ 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 0/20 1/24 1/28 1/10 #16 1/18.5 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. 26:0 SPAN? END-BAY 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) For lightweight concrete having equilibrium density in the range of 90 to 115 6, the values shall be multiplied by (1.65-0005w,) but not less han 1.09. b) For other than 60,000 psi, the values shall be multiplied by (0.4+1/100,000) 1/21 30.0 BM WIDTH 16 TYP 28-0 DM WIDTH 16' TYP 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? INTERIOR BAY RECESS 2 AT BALCONY EDGE 6-10 1 SPAN? END-BAY SPAN? LEVER
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. c. Draw the slab and show its thicknesses in the following diagram. Determine where varying the slab thickness is appropriate for construction efficiency. 15:0 4 17-0 16-0 30-0 15-0 BM WIDTH 12 TYP 4.9 An architect wants to design a concrete floor where columns are placed at 40-ft on-center along both perpendicular directions. Because of headroom limitations, the thinnest possible slab should be used for this floor. Refer to the design aid graphs from Architect's Studio Companion on the next page and answer the following questions. a) Suggest two alternative framing systems that may be used for this floor. Clearly explain the reason for your selection and show any span length or thickness/depth that is taken from the graph to justify your choice. b) For each of the suggested framing systems, draw a cross-section showing a representative segment of the floor, label its main components and show its dimensions (slab thickness and joist depth).
Transcribed Image Text: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. c. Draw the slab and show its thicknesses in the following diagram. Determine where varying the slab thickness is appropriate for construction efficiency. 15:0 4 17-0 16-0 30-0 15-0 BM WIDTH 12 TYP 4.9 An architect wants to design a concrete floor where columns are placed at 40-ft on-center along both perpendicular directions. Because of headroom limitations, the thinnest possible slab should be used for this floor. Refer to the design aid graphs from Architect's Studio Companion on the next page and answer the following questions. a) Suggest two alternative framing systems that may be used for this floor. Clearly explain the reason for your selection and show any span length or thickness/depth that is taken from the graph to justify your choice. b) For each of the suggested framing systems, draw a cross-section showing a representative segment of the floor, label its main components and show its dimensions (slab thickness and joist depth).
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