SD-Lecture14-Seismic-Codes-IV

SD-Lecture14-Seismic-Codes-IV - Soil Dynamics Lecture 14...

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Soil Dynamics Lecture 14 Seismic Codes California Building Code - Part IV 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. - Cv 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 nth 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 shear force at the base of the building. - 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.
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Question #01. A residential high-rise building has a flexible upper portion (its tower) and a more rigid lower platform portion (the parking garage). Both portions are classified as “regular”. Using the static lateral force procedure, what is the maximum period for the entire structure? A. 0.28 sec. B. 0.32 sec. C. 0.35 sec. D. 0.50 sec.
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Answer to #01. C. CBC Section 1629.8.3, Item 4 states that the static lateral force procedure of CBC Section 1630 is the appropriate method of calculation if, T entire structure ≤ 1.1 T upper portion The maximum period of the entire structure is, T maximum ≤ (1.1)(0.32 sec) = 0.35 sec
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Question #02. Both structures shown below are regular and have an upper flexible tower with a lower stiffer platform. Using CBC Section 1629, which of the structures can be designed using the static lateral force procedure, provided that the period of the entire structure is not greater than 1.1 times the period of the upper portion? A. Structure I only. B. Structure II only. C. Both I and II. D. Neither.
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Answer to #02. B. CBC Section 1629.8.3, Item 4 permits the use of the static lateral load procedure of Section 1630 when the average story stiffness of the lower portion is at least 10 times the average story stiffness of the upper portion. K average, rigid lower portion ≥ 10 K average, flexible upper portion For structure I,
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An 80 foot structure in California has a concrete bearing wall system along one principal axis and a special moment-resisting steel frame along the orthogonal principal axis. What value of
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SD-Lecture14-Seismic-Codes-IV - Soil Dynamics Lecture 14...

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