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SD-Lecture13-Seismic-Codes-III

# SD-Lecture13-Seismic-Codes-III - Soil Dynamics Lecture 13...

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Soil Dynamics Lecture 13 Seismic Codes California Building Code – Part III In a Problem Format

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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. - 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. - Δ s is the inter-story drift.
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.
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.
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. Non-building structures include all self-supporting structures other than buildings that carry gravity loads and resist seismic forces. Provisions for “rigid structures” and “tanks with supported bottoms” are given in the CBC sections 1634.3 and 1634.4 respectively. Based on the CBC Section 1634.5, other non-building structures excluding rigid structures and tanks with supported bottoms should be designed to resist design seismic forces not less than those forces determined from CBC Formula 34-2, V = 0.56 C a I W Note that for seismic zone 4, the total design base shear should also not be less than CBC Formula 34-3, V = ( 1.60 Z N v I / R ) W
Question #04.

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SD-Lecture13-Seismic-Codes-III - Soil Dynamics Lecture 13...

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