HW_1_Solutions

# HW_1_Solutions - CE 227 Homework#1 Solutions Adapted from...

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CE 227 Homework #1 Solutions Adapted from: Troy Morgan Problem 1 – Performance Goals This problem primarily deals with seismic performance goals, as implied by the Uniform Building Code (UBC) and as implemented in performance-based earthquake engineering. These performance goals are important in setting design parameters with which the final design must comply. Part A The UBC (1994, 1997, and years gone by) do not have explicit performance goals stated. However, if one refers to the 1996 SEAOC Blue Book Commentary (on which the 1997 UBC is based), the performance goals intended by the Code committee become clear. The performance goals implied by the UBC go something like this: “limited, but repairable damage in the frequent earthquake, life-safety in the rare earthquake (defined as one having a recurrence interval = 475 years), and no collapse in the very rare earthquake (defined as one having a recurrence interval = 975 years.)” Simply stating the second of these three goals is sufficient for this exercise, however, since the other two are buried in the Blue Book commentary. Part B We should classify the Class Project Building (herein referred to as “the building”) as an “essential facility.” While this building is not categorized as essential by the building code, the owner’s desired performance criteria of operational with weeks of a rare event places it in this category. Part C The table below describes, in probabilistic terms, the level of seismic hazard we should consider for this building. These are standard for many institutions, and in fact, large organizations (i.e. Intel, Genentech, University of California) explicitly state these for all projects. Name Reccurence Interval PE in 50 yr. Frequent 36 yr 75% Occasional 72 yr 50% Rare 475 yr 10% Very Rare 975 yr 5% Part D The matrix below shows a range of performance goals for the subject building. The color coding is defined in the legend below the matrix, using an assortment of hues for your viewing enjoyment. The purpose of this matrix is to contrast the building with that of a UBC-designed building. 1

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CE 227 Homework #1 Solutions Adapted from: Troy Morgan Functional Immediate Occupancy Life Safe Collapse Prevention Frequent Occasional Rare Very Rare Exceeds performance goals for project building Target performance of project building Fails to meet performance goals of project building, but meets UBC Fails to meet intended UBC performance goals What we mean by Functional, Immediate Occupancy, Life Safe, and Collapse Prevention, will be defined later in terms of EDP’s. By “later,” we mean “Part E,” or approximately 0.75” below this sentence. Part E Here we wish to provide specific performance parameters (also Engineering Demand Parameters, or EDP’s, in the parlance of our colleagues at PEER) corresponding to the selected performance levels. The table below summarizes the performance goals for the project building. Actually, it’s on the following page. Note that the grading will be fairly liberal for this question, and what is shown is the upper-bound
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## This note was uploaded on 05/09/2008 for the course CE 227 taught by Professor Mahin during the Spring '06 term at Berkeley.

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HW_1_Solutions - CE 227 Homework#1 Solutions Adapted from...

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