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CE_227_Hwk2_06 - University of California at Berkeley Civil...

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University of California at Berkeley Civil and Environmental Engineering Instructor: Stephen A. Mahin Spring Semester 2006 CEE 227 -- Earthquake Resistant Design Problem 4 - Conceptual Design (due in Discussion Section, Feb. 16) In this problem, you are to propose possible alternate lateral load and vertical load resisting system concepts that can be used for the “theme” building being considered in class. Your answer should be very brief (one page) in spite of how long the problem statement is. This effort is needed since the lateral loads required for the building under current codes have substantially increased since the original design in 1994, and other new provisions, such as the redundancy factor, or more stringent performance-based design criteria, generally necessitate the use of additional framing elements to help resist lateral load or reduce lateral displacements. As such, it is not likely feasible to simply make the members in the 1994 configuration stiffer and stronger. Assume that the column grid on the interior of the building is fixed at 30-ft intervals in each direction (an architectural constraint) as shown below. The locations of the moment frames employed in the 1994 code based design are highlighted along portions of the perimeter of the building. The gravity load only framing consisted of axially loaded columns and pin-ended beams. Gravity Only Framing Moment- Resisting 30 ft (typ.) Typical Floor Plan Prepare a table or list where you systematically, but schematically, indicate at least four alternative lateral load-resisting systems that might be considered for this building. No calculations or member sizes are needed. However, indicate where the CE 227 Homework 1
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elements would be located and what type of system is to be used, along with a very brief narrative (bullets) indicating the relative advantages and disadvantage of each of these systems. For the alternative lateral load-resisting systems, you might consider moment-resisting frames, braced frames, shear walls, and so on. In discussing the possible alternatives, various issues will need to be considered, including economics, strength, stiffness, redundancy, overall torsional resistance, and possible interference with interior floor spaces or views. In carrying out this assignment, you should consider or comment on issues such as: If you consider a moment-resisting frame, where will the moment-resisting connections be located (i.e., in all frames in both directions, only in perimeter frames, in all or only some (one?) bays around the perimeter, one or more interior core frames, etc)? What spacing of exterior columns will you use (e.g., you might alter the column spacing along the perimeter of the building while retaining the 30- ft. module on the interior)? In the original 1994 design, two perimeter moment frames, each with three bays, were used in both principal directions of the building.
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CE_227_Hwk2_06 - University of California at Berkeley Civil...

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