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SD-Lecture57-Diaphragm-Theory-3

# SD-Lecture57-Diaphragm-Theory-3 - CEGCEG-5065C Soil...

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CEG CEG-5065C Soil Dynamics 5065C Soil Dynamics Lecture Lecture 57 57 Diaphragm Theory - Part III In a Problem Format Luis Prieto-Portar 2009

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Question #01. A wood residence has a wood structural panel roof diaphragm (which is shown in plan view below). Two retail stores are separated by a common wood shear wall, parallel to the north-south lateral loading. The height of the building is 14 feet. The roof diaphragm is adequately anchored to the shear wall. Assume = 1.0. Determine the roof diaphragm shear force along line 3. A. 3,800 lb f . B. 5,600 lb f . C. 7,500 lb f . D. 9,000 lb f .
Answer to #01. C. The shear wall along line 3 carries half of the diaphragm shear between lines 2 and 3. ( ) ( ) 150 100 2 00 2 7 5 f f lb / ft ft wL V , lb = = =

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Question #02. A wood residence has a wood structural panel roof diaphragm (which is shown in plan view below). Two retail stores are separated by a common wood shear wall, parallel to the north-south lateral loading. The height of the building is 14 feet. The roof diaphragm is adequately anchored to the shear wall. Assume = 1.0). Along line X between lines 1 and 2, determine the maximum diaphragm chord force in the chord member. A. 750 lbf . B. 1,200 lbf . C. 2,300 lbf . D. 4,700 lbf .
Answer to #02. B. The maximum diaphragm chord force occurs at the midpoint between lines 1 and 2. It is calculated as the bending moment of a simple beam under a distributed load, per unit depth of diaphragm. ( ) ( ) ( ) 2 2 150 50 8 8 1 17 0 0 4 f f lb / ft ft M wL C b b ft , lb = = = =

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Question #03. A wood residence has a wood structural panel roof diaphragm (which is shown in plan view below). Two retail stores are separated by a common wood shear wall, parallel to the north-south lateral loading. The height of the building is 14 feet. The roof diaphragm is adequately anchored to the shear wall. Assume = 1.0). Determine the diaphragm chord force at the intersection of lines Y and 1. A. 0 lbf . B. 290 lbf . C. 600 lbf . D. 1,200 lbf .
Answer to #03. A. Chords are the boundary members of a diaphragm, and are perpendicular to the direction of the lateral load. Chords are designed to carry moments and provide all the resistance to the flexural stresses. Chord forces at the chord ends are zero.

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Question #04. A wood frame shear wall in a seismic zone 2 is shown in elevation below. The shear wall is part of a one-story structure with a flexible roof diaphragm. The shear wall panels have the same thickness. What is the approximate lateral load carried by panel 1? A. 1,800 lbf. B. 2,600 lbf. drag supports C. 3,000 lbf. D. 9,000 lbf.
Answer to #04. B. ( ) ( ) ( ) ( ) 10 ft + 20 ft + 5 ft = 35 ft 9 000 257 35 257 10 2 570 f f b , lb V lb / ft b ft V b lb / f , t lb ft υ = = = = = = = f f

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SD-Lecture57-Diaphragm-Theory-3 - CEGCEG-5065C Soil...

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