SD-Lecture53-Seismic-Codes-3

SD-Lecture53-Seismic-Codes-3 - CEGCEG-5065C Soil Dynamics...

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CEG CEG-5065C Soil Dynamics 5065C Soil Dynamics Lecture Lecture 53 53 Seismic Codes California Building Code – Part III In a Problem Format Luis Prieto-Portar 2009
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List of Symbols. - a p is the in-structure component of the amplification factor. - C a is the seismic response coefficient for proximity. - C p is the horizontal force factor. - C t is a numerical coefficient for the period. - C v is the seismic response coefficient. - F p is total (design or service) lateral seismic force. - F t is the concentrated force at the top of the structure. - h n is defined as the height of the building above the base to the n th level. - I is the seismic importance factor. the near source factor for - N a is the near source factor for C a . - N v is the near source factor for C v . - R is the response modification factor; it reflects the inherent over-strength and global ductility capacity of different lateral-force resisting systems. - R p is the component response modification factor; the horizontal force factor. - S is the soil profile classification, such as, S A , S B , S C , S D , S E and S F ). - T is the fundamental period. - V is the base shear force. - W is the weight of the entire structure (dead + live loads). - Z is the seismic zone influence factor. - o is the seismic force amplification factor. - s is the inter-story drift.
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Question #01. For special moment-resisting space frames, what are the values of a p and R p (the in- structure component of the amplification factor, and the total design or service lateral seismic force respectively), for the attachment of suspended ceilings? NB : attachments include the anchorages and the required bracings. A. 1.0 and 3.0. B. 1.0 and 4.0. C. 2.5 and 3.0. D. 2.5 and 4.0.
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Answer to #01. A. The CBC Table 16-O gives a p and R p values for elements of the structure, for non- structural components and for equipment. Anchorages for suspended ceilings has an a p value of 1.0 and an R p value of 3.0.
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Question #02. You are going to design a billboard structure next to a major highway. The structure will be placed on its own foundation (versus sitting upon another building). What value of the seismic force over-strength factor o should be used? A. 2. B. 3. C. 4. D. 5.
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Answer to #02. A. Signs and billboards are known as non-building structures. CBC Table 16-P states that the seismic force over-strength factor o = 2.
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Question #03. Non-building structures that are not “rigid structures” and “tanks with supported bottoms” should be designed to resist design seismic forces not less than, A. 0.11 C a I W B. 0.56 C a I W C. 0.70 C a I W D. 3.00 C a W / R
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Answer to #03. B.
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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-Lecture53-Seismic-Codes-3 - CEGCEG-5065C Soil Dynamics...

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