SD-Lecture56-Diaphragm-Theory-2

SD-Lecture56-Diaphragm-Theory-2 - CEG CEG-5065C Soil...

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Unformatted text preview: CEG CEG-5065C Soil Dynamics 5065C Soil Dynamics Lecture Lecture 56 56 Diaphragm Theory - Part II In a Problem Format Luis Prieto-Portar 2009 Question #01. Rigid diaphragms distribute the lateral force to the resisting elements proportional to the, A. relative rigidities of these elements. B. tributary areas of these elements. C. base shear. D. deflection of those elements. Answer to #01. A. Rigid diaphragms distribute lateral forces in proportion to the rigidities of vertical resisting elements. They do not distribute lateral forces on a tributary load basis, as do flexible diaphragms. Question #02. Which of the following sentences are true regarding rigid roof diaphragms? A. They distribute the lateral story shears to the resisting elements. B. They transmit torsion to the resisting elements. C. They do not deform when they are subjected to the lateral loads. D. All of the above answers are true. Answer to #02. D. Rigid diaphragms, such as concrete slabs and concrete on metal deck floor systems, do not bend due to lateral loads. They distribute lateral story shears to vertical resisting elements. As opposed to flexible diaphragms, rigid diaphragms transmit torsion to the vertical resisting elements. Question #03. Which of the following diaphragms would be considered rigid diaphragms? A. Plywood floors. B. Wood sheathed floors. C. Light metal decks. D. Metal decks with concrete fill. Answer to #03. D. Metal decks with concrete fill are considered rigid diaphragms because they are structurally relatively thick and heavy, and will not change shape under lateral loads. Question #04. What measure can be taken to minimize the deflection of a wood structural panel roof diaphragm? A. Decrease the plywood thickness. B. Use double studs at the corners. C. Decrease the nail spacing. D. Increase the diaphragm span. Answer to #04. C. CBC provisions limit diaphragm deflection by specifying maximum diaphragm dimension ratios in Table 23-II-G. One way to further minimize diaphragm deflection is to decrease the nail spacing along the edges of the diaphragm. The nail spacing determines the shear resistance across the diaphragm when it is subjected to lateral loads. Question #05. Torsional effects can be critical for elements located in which of the following areas? A. On the center of rigidity. B. Close to the center of rigidity. C. Far from the center of rigidity. D. None of the above. Answer to #05. C. 1) The center of rigidity is the point which the resultant of the resistance to the applied lateral force acts. It is called the center of rigidity because the individual elements resist the lateral force in proportion to their rigidities. 2) The center of mass is the point through which the applied lateral force acts....
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This note was uploaded on 09/11/2011 for the course CEG 5065c taught by Professor Staff during the Fall '09 term at FIU.

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SD-Lecture56-Diaphragm-Theory-2 - CEG CEG-5065C Soil...

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