SD-Lecture55-Diaphragm-Theory-1

SD-Lecture55-Diaphragm-Theory-1 - CEGCEG-5065C Soil...

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CEG CEG-5065C Soil Dynamics 5065C Soil Dynamics Lecture Lecture 55 55 Diaphragm Theory - Part I In a Problem Format Luis Prieto-Portar 2009
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Question #01. Which of the following are known as resisting elements? A. Columns. B. Shear walls. C. Connections. D. All the above.
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Answer to #01. D. Elements that resist story shears are known as resisting elements . Resisting elements are columns, shear walls, connections and structural systems, such as braced frames or moment-resisting frames.
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Question #02. Which of the following elements resist lateral forces? I. Shear walls. II. Horizontal diaphragms. III. Moment-resisting frames. IV. Braced frames. A. I only. B. II only. C. II, III and IV. D. I, III and IV.
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Answer to #02. D. Resisting elements (for example, columns, shear walls, braced frames, moment- resisting frames and connections) resist lateral forces. Horizontal diaphragms (for example, floors and ceilings) distribute the lateral forces to the resisting elements.
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Question #03. The base shear in a shear wall building is resisted by, A. The parallel walls only. B. The perpendicular walls only. C. All walls. D. The horizontal diaphragms and all walls.
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Answer to #03. A. The base shear is the total force delivered to the structure at the base. In perpendicular walls, the forces are tensile and compressive, while in parallel walls the forces are shear. Therefore, in shear wall buildings, parallel walls resist the base shear.
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Question #04. The transverse seismic loading is, A. perpendicular to the shorter dimension of the building. B. parallel to the shorter dimension of the building. C. parallel to the longer dimension of the building. D. independent of the dimensions of the building.
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Answer to #04. B. The direction of seismic loading applied to a structure is typically either in the transverse (that is, the short dimension) or longitudinal (that is, the long dimension) direction. Therefore, transverse seismic loading describes a loading that is parallel to the shorter dimension of the structure.
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Question #05. The base shear force distribution to the floors above the base should, A. decrease linearly with height above the base. B. increase linearly with height above the base. C. be uniform at each floor. D. be concentrated at the roof.
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Answer to #05. B. CBC Section 1630.5 states that the base shear forces should be distributed throughout the height of the structure, in conformance with CBC Formulas 30-13, 30-14 and 30-15. At each level, the distributed force F x increases linearly as the height above the base increases.
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Question #06. The walls perpendicular to the direction of lateral force, I. are affected by ground acceleration force. II. have no resistance to bending moment. III. contribute inertia load to the diaphragm. A. I and II. B. I and III. C. II and III. D. I, II and III.
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Answer to #06. B. Walls that are perpendicular to the lateral force are affected by ground acceleration forces and carry tensile and compressive forces. They resist the bending moment.
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