Tall Buildings .


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Tall Buildings. Performance-based guidelines and regulations. Joe Maffei Rutherford & Chekene. Jack Moehle UC Berkeley. Outline. Today’s tall buildings Applicability of PBEE to tall buildings PBEE practice needs PEER Tall Building Initiative. Buildings over 240 ft
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Tall Buildings Performance-based rules and directions Joe Maffei Rutherford & Chekene Jack Moehle UC Berkeley

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Outline Today\'s tall structures Applicability of PBEE to tall structures PBEE rehearse needs PEER Tall Building Initiative

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Buildings more than 240 ft (proposed, affirmed, or under development) San Francisco – 38; Los Angeles – 53; Seattle …

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CONDO HOTEL $ RETAIL PARKING Types of Occupancy $

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STEEL GRAVITY FRAMING $

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Washington Mutual/Seattle Art Museum

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Buckling-limited supports

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What\'s distinctive about these structures? Elite materials Framing frameworks not fulfilling code prescriptive points of confinement Non-prescriptive outlines are acknowledged in the code by exhibiting in any event comparable seismic execution . UBC 1629.10.1, 1605.2, 104.2.8 after MKA

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What is "Comparable" Performance? Consider both the planned execution of the code and the execution of a normal decent prescriptive configuration. Comparability to ineffectively performing yet code-prescriptive structures ought not be satisfactory. Use Seismic Peer Review.

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Two-Stage Design Determine the qualities at nonlinear areas utilizing the construction law necessities Code (DBE) level quake  R component Minimum base shear All different activities are intended to stay versatile under MCE level ground movements: Wall shear, shear rubbing, divider flexure outside of expected yield areas, floor and rooftop stomachs and authorities and associations, establishment border dividers, and so on

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Example PBEE Practice Needs Acceptability of yielding outside base pivot zone.

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Protection against shear disappointment

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Protection against sliding shear

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Linear and nonlinear demonstrating presumptions Elastic ETABS Model UCSD Wall RUTHERFORD & CHEKENE

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Wall: E eff = 0.2 E c Slab: E eff = 0.1 E c RUTHERFORD & CHEKENE

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PBEE Practice Needs Applicable ground movements (e.g., T = 9 sec) Ground movement scaling Input movements for underground levels Performance goals Structural Design (Joe\'s main 15) Minimum base shear Capacity outline elements Inherent chunk outrigger impact Story instrument assurance Wall shear quality Effective damping in NLRH examination Other NLRH suppositions Effective flexible firmness Podium power exchange Rational float limits P-delta displaying Concrete section to center divider associations Steel confining to center divider associations Deep tangle piece conduct Dual framework necessities

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Tall Buildings Initiative 24 month activity to propel configuration of tall structures Main members PEER, SCEC, USGS, SFDBI, LADBS, FEMA ATC, LATBSDC, SEAOC, SEAONC Project Management Committee (T-PAC) J. Moehle, Y. Bozorgnia N. Abrahamson, M. Lew, P. Somerville R. Cheeseburger, H. Krawinkler, M. Moore, F. Naeim R. Lui Kickoff meeting – 11 August 2006

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Scope Tall structures Seismic configuration of auxiliary framework Coastal California Concrete and steel Residential concentrate, yet not barring different inhabitances

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Tasks Establish and work Project Advisory Committee (T-PAC) Research assignments Consensus execution targets Assessment of ground movement determination and scaling methods Synthetically produced ground movements Review of artificially created ground movements Guidelines on ground movement choice and alteration Guidelines on demonstrating and acknowledgment criteria Input ground movements for tall structures with underground levels Other errands to be characterized… . Rules for seismic outline of tall structures Workshops, presentations, and so forth. Last answer to supporting associations

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What do you think about this execution situation? Uncommon seismic tremor situation harm, (one in ten shot of happening amid the 50-yr life of apartment suite towers) Performance Objectives Core bunch: W. Holmes , C. Kircher, L. Kornfield, B. Petak, N. Yousef Approach: Obtain contribution from partners, define strawman execution objective, workshop, …

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Story level Story Moment Selection and scaling of ground movement Core bunch: J. Moehle , S. Mahin, J. Hooper, T. Yang, C. McQuiod Approach: Select ground movement containers, break down building models to create reaction measurements, and test different ground movement choice and scaling techniques against the "genuine" result.

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Ground movement reproduction, audit, and choice and scaling rules Core bunch: P. Somerville , B. Aagaard, N. Collins, R. Graves Approach: Develop waveforms for huge sizes, little separations in SF and LA, obliged by PSHA Core bunch: P. Somerville , B. Aagaard, N. Collins, R. Graves Approach: Develop waveforms for expansive extents, little separations in SF and LA, compelled by PSHA Review: F. Naeim, Y. Bozorgnia , N. Abrahamson, B. Chiou, CB Crouse, D. Dreger, Y. Moriwaki, Y. Zeng Guidelines : Y. Bozorgnia, N. Luco , F. Naeim, J. Hooper, N. Abrahamson, J. Maffei

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Guidelines for Modeling and Acceptance Criteria Core bunch – J. Malley , G. Deierlein, H. Krawinkler, J. Maffei, M. Pourzanjani and J. Wallace Approach: Workshop to distinguish key issues, assignments to specialists to create standards, techniques, and qualities. Key issues: Basic standards, including limit plan General demonstrating issues (e.g., successful damping) Podium power exchange Modeling of different frameworks and components (center dividers, outlines, coupling bars, and so forth.) Foundation displaying (with Task 8)

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q f u g u f Input ground movements for tall structures with underground levels Core Group : J. Stewart , C.B. Crouse, M. Lew, A. Mikami, F. Ostadan, E. Taciroglu Approach : Report on the condition of practice and "workmanship," and suggest future studies. Key issues : Quantifying ground movements in storm cellars with respect to free-handle Reductions of even movements Introduction of turn Are these impacts huge at the EDP level (and past)? Significance of adaptability of implanted sub-structure

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Final item Guidelines for execution based seismic configuration of tall structures December 2008

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Roof float, ft Wall base shear, k Wall minute at 13 th floor, 1000 x k-ft Minimum Maximum Mean (m) m + s c.o.v. Nonlinear static 2.1 6.7 4.2 5.4 0.23 7600 29700 15500 22200 0.43 5500 513 1080 900 1090 0.21 760 thirteenth BASE PBEE hone needs (a) Building height (b) Summary of results

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