SD-Lecture52-Seismic-Codes-2

# SD-Lecture52-Seismic-Codes-2 - CEGCEG-5065C Soil Dynamics...

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CEG CEG-5065C Soil Dynamics 5065C Soil Dynamics Lecture Lecture 52 52 Seismic Codes California Building Code – Part II In a Problem Format Luis Prieto-Portar 2009

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List of Symbols. - ap is the in-structure component of the amplification factor. - Ca is the seismic response coefficient for proximity. - Cp is the horizontal force factor. - Ct is a numerical coefficient for the period. - Cv is the seismic response coefficient. - Fp is total (design or service) lateral seismic force. - Ft is the concentrated force at the top of the structure. - hn is defined as the height of the building above the base to the nth level. - I is the seismic importance factor. a the near source factor for a - Na is the near source factor for Ca . - Nv is the near source factor for Cv . - R is the response modification factor; it reflects the inherent over-strength and global ductility capacity of different lateral-force resisting systems. - Rp is the component response modification factor; the horizontal force factor. - S is the soil profile classification, such as, SA , SB , SC , SD , SE and SF ). - 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.
Question #01. CBC provides the following formula to determine the fundamental period T of a building with reinforced concrete shear walls (Method A, Section 1630.2.2), 2 0 1 0 2 e C e t n c D . A A . where C h A ± ² ³ ´ µ = + = · ´ µ ¸ ¹ º » ¼ What is the maximum value of D e / h n ? A. 0.30. B. 0.90. C. 2.75. D. R w

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Answer to #01. B. Method A of the CBC Section 1630.2.2, Item 1 details that the value of D e / h n should not exceed 0.9 when used in CBC Formula 30-9.
Question #02. In order to determine the fundamental period T of a building, the CBC gives the following formula, 2 1 2 n i i i n i i w T g f δ π = = This formula represents, A. The period defined by Method A. B. The period defined by Method B. C. The static period. D. The dynamic period. 1 i =

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Answer to #02. B. Model B defined in CBC Section 1630.2.2, Item 2, Formula 30-10 used to calculate the fundamental period T . The terms static period and dynamic period have no meaning.
Question #03. The natural period T of a building is 4 seconds. At the roof level of the structure, the concentrated force F t (which is additional to the base shear V) , should be determined by which of the following formulas? A. F t = 0 A. F t = 0.07 TV A. F t = C t ( h n ) 0.75 A. F t = 0.25 V

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Answer to #03. D. CBC Section 1630.5 states that, if the value of T is 0.7 seconds or less, the additional concentrated force at the top, F t is equal to zero. Otherwise, use the CBC Formula 30-14,
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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-Lecture52-Seismic-Codes-2 - CEGCEG-5065C Soil Dynamics...

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