2004_hw_2

2004_hw_2 - 1.054/1.541 Mechanics and Design of Concrete...

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1.054/1.541 Mechanics and Design of Concrete Structures Spring 2004 Prof. Oral Buyukozturk Massachusetts Institute of Technology 1.054/1.541 Mechanics and Design of Concrete Structures (3-0-9) Homework #2 Assigned: Thursday, February 26, 2004 Due: Tuesday, March 9, 2004 Creep Strain in A Reinforced Concrete Building Column Introduction A typical interior column in a 3-story reinforced concrete building is to be investigated, considering the load increments during construction. From recorded dates of casting and form removal, the following load history was determined for the first floor column. Time (days) Event 0 Column cast 30 First floor shoring removed, P = 300 kips 60 Second floor cast, P = 200 kips 120 Penthouse and roof case, P = 250 kips The column is 30 x 30 inches and contains #8 bars ( A s = 6.32 in 2 ), the modulus of elasticity for the reinforcing steel is E s = 29 X 10 6 psi, and for the concrete E c = 2.9 X 10 6 psi. The attached data indicates the specific creep function for the concrete used in this question (See Attachment A).

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This note was uploaded on 11/29/2011 for the course CIVIL 1.00 taught by Professor Georgekocur during the Spring '05 term at MIT.

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2004_hw_2 - 1.054/1.541 Mechanics and Design of Concrete...

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