SD-Lecture11-Seismic-Codes-I

# SD-Lecture11-Seismic-Codes-I - Soil Dynamics Lecture 11...

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Soil Dynamics Lecture 11 Seismic Codes California Building Code – Part I 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.
Question #01. The California Building Code (CBC) bases its seismic zone factor on the effective peak ground acceleration (EPA) that has a 10% chance of being exceeded in 50 years. What is this EPA intended to represent? A. The maximum probable earthquake. B. The minimum considered (capable) earthquake. C. The maximum predictable earthquake. D. The minimum theoretical earthquake.

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Answer to #01. A. The CBC’s provisions are set as minimum requirements . Section 1627 defines the design basis ground motion (maximum probable) as that ground motion with a 10% chance of being exceeded in 50+ years, as determined by a site specific hazard analysis or from a seismic hazard map.
Question #02. In designing and detailing structures, the purpose of complying with the CBC seismic requirements is to prevent which of the following in the event of an earthquake? A. Structural damage. B. Architectural damage. C. Loss of life. D. Disruption of business.

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Answer to #02. C. The purpose of CBC, Section 101.2, is to prevent loss of life in the event of an earthquake. Although the seismic codes affect the performance of structures and tend to prevent structural damage during an earthquake, this is not the main intent of the codes. According to CBC’s Section 1626.1, the primary purpose of earthquake provisions is to avoid major structural failures in order to safeguard lives, not to limit damage or maintain function.
In what amount does the actual seismic force that can be developed in a structure exceed the design seismic force calculated using CBC principles? A. Between 1.0 and 1.3.

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SD-Lecture11-Seismic-Codes-I - Soil Dynamics Lecture 11...

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