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4.5 Since the 1960's, thin-shell concrete roof structures have seldom been utilized in the United States and Canada primarily because: a. building codes often make it difficult to obtain approval for their use b. design fees are substantially greater than for more conventional structures c. formwork can be prohibitively expensive d. materials (concrete and steel) are too costly

4.5 Since the 1960's, thin-shell concrete roof structures have seldom been utilized in the United States and Canada primarily because: a. building codes often make it difficult to obtain approval for their use b. design fees are substantially greater than for more conventional structures c. formwork can be prohibitively expensive d. materials (concrete and steel) are too costly

Architectural Drafting and Design (MindTap Course List)
Architectural Drafting and Design (MindTap Course List)
7th Edition
ISBN:9781285165738
Author:Alan Jefferis, David A. Madsen, David P. Madsen
Publisher:Alan Jefferis, David A. Madsen, David P. Madsen
Chapter42: Common Commercial Construction Materials
Section: Chapter Questions
Problem 42.2Q
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4.5 Since the 1960's, thin-shell concrete roof structures have seldom been utilized in the United States and Canada primarily because: a. building codes often make it difficult to obtain approval for their use b. design fees are substantially greater than for more conventional structures c. formwork can be prohibitively expensive d. materials (concrete and steel) are too costly 4.6 A one-way slab is used typically in which of the following types of buildings? a. Museum b. Parking c. Library d. Warehouse 4.7 The cross section of a conventionally reinforced concrete one-way slab is shown below. Using ACI Table 9.5(a), answer the following questions: TI 5-0 CANTILEVER 23-0 END-BAY SPAN L3 INTERIOR-BAY a. What is the minimum slab thickness at end bays (T2)? BM WIDTH 20 (197) Member Solid one- way slabs TABLE 9.5(a)- MINIMUM THICKNESS OF NONPRESTRESSED BEAMS OR ONE-WAY SLABS UNLESS DEFLECTIONS ARE CALCULATED 23-0 END-BAY 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 U/20 (24 1/28 //10 Beams or ribbed one- way slabs 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, we in the range of 90 to 115 let, the values shall be multiplied by (1.65-0.005we) but not less than 1.09. b) Forf, other than 60,000 psi, the values shall be multiplied by (0.4+ f/100,000) U/16 U/18.5 U/21 (18
Transcribed Image Text:4.5 Since the 1960's, thin-shell concrete roof structures have seldom been utilized in the United States and Canada primarily because: a. building codes often make it difficult to obtain approval for their use b. design fees are substantially greater than for more conventional structures c. formwork can be prohibitively expensive d. materials (concrete and steel) are too costly 4.6 A one-way slab is used typically in which of the following types of buildings? a. Museum b. Parking c. Library d. Warehouse 4.7 The cross section of a conventionally reinforced concrete one-way slab is shown below. Using ACI Table 9.5(a), answer the following questions: TI 5-0 CANTILEVER 23-0 END-BAY SPAN L3 INTERIOR-BAY a. What is the minimum slab thickness at end bays (T2)? BM WIDTH 20 (197) Member Solid one- way slabs TABLE 9.5(a)- MINIMUM THICKNESS OF NONPRESTRESSED BEAMS OR ONE-WAY SLABS UNLESS DEFLECTIONS ARE CALCULATED 23-0 END-BAY 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 U/20 (24 1/28 //10 Beams or ribbed one- way slabs 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, we in the range of 90 to 115 let, the values shall be multiplied by (1.65-0.005we) but not less than 1.09. b) Forf, other than 60,000 psi, the values shall be multiplied by (0.4+ f/100,000) U/16 U/18.5 U/21 (18
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