SD-Lecture58-Diaphragm-Theory-4

SD-Lecture58-Diaphragm-Theory-4 - CEGCEG-5065C Soil...

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CEG CEG-5065C Soil Dynamics 5065C Soil Dynamics Lecture Lecture 58 58 Diaphragm Theory - Part IV In a Problem Format Luis Prieto-Portar 2009
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Question #01. The P- effect on shears, axial forces and moments of frame members is considered as, A. the primary moment. B. the secondary moment. C. the overall moment. D. none of the above.
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Answer to #01. B. The P- effect is an additional column bending stress caused by an earthquake (or any lateral load, such as wind). Originally, the vertical loads (live and dead) are constant and concentric with the base of the building. When drift occurs under the horizontal seismic loading, the vertical loads become eccentric with the base. Under these circumstances, there are two types of moment. The primary moment is the bending moment due to the bending of the columns under the lateral loads. The secondary moment is the additional moment from the P- effects, where vertical loads ( P ) act on the building elements that have been laterally displaced ( ) from the base. The P- or secondary moment effects, on shears, axial forces, and moments of frame members should be considered in building design. This topic is covered in the CBC Section 1630.1.3.
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Question #02. For the one-story building shown below, determine the story drift ratio. A. 0.008 B. 0.1 C. 3.0 D. 120
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Answer to #02. A. Using CBC Section 1627, the story drift ratio is the story drift divided by the story height, ( ) 2 0 008 20 12 inches . h in ft ft Δ = = ± ² ³ ´ µ
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Question #03. When the over-turning moment increases faster than the restoring moment from the frame stiffness, the frame is considered to be, A. stable B. unstable C. X-braced D. a thick shear wall
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Answer to #03. B. Structures should be designed to resist the overturning effects caused by seismic loading. When the overturning moment increases faster than the restoring moment from the frame stiffness, the frame is unstable . CBC Section 1630.8.1 states the overturning effects on every element should be transferred to the foundation.
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When using the appropriate CBC table, what should be the maximum allowable shear stress for a wood structural panel roof diaphragm when the following data apply? 1) Using a inch thick Structural I plywood; 2) 2 inch framing members; 3) Case 1 – blocked; 4) 8d common nails; 5) Nail spacing at the diaphragm boundaries is 4 inches on-center; 6) Field nailing spacing is 12 inches on-center. A. 320
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SD-Lecture58-Diaphragm-Theory-4 - CEGCEG-5065C Soil...

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