SD-Lecture12-Seismic-Codes-II

SD-Lecture12-Seismic-Codes-II - Soil Dynamics Lecture 12...

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Soil Dynamics Lecture 12 Seismic Codes California Building Code – Part II In a Problem Format
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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. - 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. - Ωo is the seismic force amplification factor. - Δs is the inter-story drift.
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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), What is the maximum value of D e / h n ? A. 0.30. B. 0.90. C. 2.75. D. R w 2 0 1 0 2 e C e t n c D . A A . where C h A = + =
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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.
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Question #02. In order to determine the fundamental period T of a building, the CBC gives the following formula, 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. 2 1 1 2 n i i i n i i i w T g f δ π = = =
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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.
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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 B. F t = 0.07 TV C. F t = C t ( h n ) 0.75 D. 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, F t = 0.07 TV For this problem’s structure, the natural period of 4 seconds, is greater than 0.7 seconds, so use Formula 30-14. However,
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This note was uploaded on 08/29/2011 for the course CEG 5905 taught by Professor Staff during the Summer '10 term at FIU.

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SD-Lecture12-Seismic-Codes-II - Soil Dynamics Lecture 12...

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