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By L. Meirovitch

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The BSE-1 Earthquake Hazard Level is similar, but not identical, to the concept of the FEMA 450 design earthquake. , two-thirds MCE). 2. 5, the modified mapped short-period spectral response acceleration parameter, SS, and modified mapped spectral response acceleration parameter at a 1-sec period, S1, shall be determined from Eq. 73]͖ (Eq. 1-1) 24 where ln(Si) ෇ natural logarithm of the spectral response acceleration parameter (“i” ෇ “S” for short-period, or “i” ෇ 1 for 1-sec period) at the desired probability of exceedance; ln(Si10͞50) ෇ natural logarithm of the spectral response acceleration parameter (“i” ෇ “S” for short-period, or “i” ෇ 1 for 1-sec period) at a 10%͞50-year exceedance rate; ln(SiBSEϪ2) ෇ natural logarithm of the spectral response acceleration parameter (“i” ෇ “S” for short-period, or “i” ෇ 1 for 1-sec period) for the BSE-2 hazard level; and ln(PR) ෇ natural logarithm of the mean return period corresponding to the exceedance probability of the desired Earthquake Hazard Level.

Minor damage. Minor damage. Canopies and Marquees Moderate damage. Moderate damage. Minor damage. Minor damage. Chimneys and Stacks Extensive damage. No collapse. Extensive damage. No collapse. Minor cracking. Negligible damage. Stairs and Fire Escapes Extensive racking. Loss of use. Some racking and cracking of slabs. Usable. Minor damage. Negligible damage. Doors Distributed damage. Many racked and jammed doors. Distributed damage. Some racked and jammed doors. Minor damage. Doors operable. Minor damage.

Two-thirds MCE). 2. 5, the modified mapped short-period spectral response acceleration parameter, SS, and modified mapped spectral response acceleration parameter at a 1-sec period, S1, shall be determined from Eq. 73]͖ (Eq. 1-1) 24 where ln(Si) ෇ natural logarithm of the spectral response acceleration parameter (“i” ෇ “S” for short-period, or “i” ෇ 1 for 1-sec period) at the desired probability of exceedance; ln(Si10͞50) ෇ natural logarithm of the spectral response acceleration parameter (“i” ෇ “S” for short-period, or “i” ෇ 1 for 1-sec period) at a 10%͞50-year exceedance rate; ln(SiBSEϪ2) ෇ natural logarithm of the spectral response acceleration parameter (“i” ෇ “S” for short-period, or “i” ෇ 1 for 1-sec period) for the BSE-2 hazard level; and ln(PR) ෇ natural logarithm of the mean return period corresponding to the exceedance probability of the desired Earthquake Hazard Level.

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