Design of a 35 Story Building in Los Angeles Using the LADBS Performance Based Design Methodology
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7/17/2019 Design of a 35 Story Building in Los Angeles Using the LADBS Performance Based Design Methodology
http://slidepdf.com/reader/full/design-of-a-35-story-building-in-los-angeles-using-the-ladbs-performance-based 1/8
6/19/13
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Creative Thinkers, Cleverly Disguised as Engineers.
Design of a 35 Story Building In
Los Angeles Using the LADBS
Performance Based Design
Methodology
LA Tall Building Structural Design Council
Conference
May 3, 2013
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Creative Thinkers, Cleverly Disguised as Engineers.
Contents
• Project Summary
• Summary of Design
Development Options
• Computer Modelling Aspects
• Main Results
• Advantages
• Material Savings
•
Summary
7/17/2019 Design of a 35 Story Building in Los Angeles Using the LADBS Performance Based Design Methodology
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6/19/13
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Creative Thinkers, Cleverly Disguised as Engineers.
Project Summary
• 888 Olive Street Los Angeles (9th & Olive)
• 35 Story Tower – 358 ft.
above grade
• 4 story podium over 2 level
basement
• 700,000 sq. ft. ofsuspended structure.
• Reinforced Concrete
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Creative Thinkers, Cleverly Disguised as Engineers.
Stage 1
Conventional Design• Dual System• Concrete Shearwalls
• Special Moment Resisting Frames• Linear Dynamic Analysis
7/17/2019 Design of a 35 Story Building in Los Angeles Using the LADBS Performance Based Design Methodology
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Creative Thinkers, Cleverly Disguised as Engineers.
Stage 2
Performance Based• First Trial• Concrete Shearwalls only
• Capacity Design – Cross Sectional Analysis
• Too many walls
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Creative Thinkers, Cleverly Disguised as Engineers.
Stage 3
Performance Based• Optimized Structural Performance• Non-Linear Analysis PERFORM 3D
• Iterations during Peer Review• Modified coupling beams combined
with shearwalls for best combination
7/17/2019 Design of a 35 Story Building in Los Angeles Using the LADBS Performance Based Design Methodology
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6/19/13
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Creative Thinkers, Cleverly Disguised as Engineers.
Modelling Aspects• Fibers – Walls
• Shear springs – Headers• Beams – column/slab outriggers
• Shell (in-plane) – Slabs (podium)
• Upper and Lower bound stiffness
T1 = 5.8s
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Creative Thinkers, Cleverly Disguised as Engineers.
Modelling Aspects• Input Earthquake Ground Motions
– MCE level
– 7 Pairs (spectral matching)
– PEER GM Database
– NEHRP Class C
7/17/2019 Design of a 35 Story Building in Los Angeles Using the LADBS Performance Based Design Methodology
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6/19/13
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Creative Thinkers, Cleverly Disguised as Engineers.
Main Results• Shear forces Elevator Core
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Creative Thinkers, Cleverly Disguised as Engineers.
Main Results• Maximum Drift
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7/17/2019 Design of a 35 Story Building in Los Angeles Using the LADBS Performance Based Design Methodology
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6/19/13
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Creative Thinkers, Cleverly Disguised as Engineers.
Main Results• Coupling Beams dissipate
most energy
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Creative Thinkers, Cleverly Disguised as Engineers.
Main Results• Core walls governed by
maximum shear stress
7/17/2019 Design of a 35 Story Building in Los Angeles Using the LADBS Performance Based Design Methodology
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Creative Thinkers, Cleverly Disguised as Engineers.
Advantages• PBD allow us to Optimize the
performance of elements of theLateral Force Resisting System
• NLDA better captures changinginelastic damage state of thestructure
• Directly addresses the level ofredundancy & safety of thestructure
• Increased Useable space due toelimination of frame beams andcolumns of Dual System
• More flexibility for parkingcirculation
• More flexibility for distribution ofMech/Elec systems
•
Reduction of Materials fromConventional Dual System
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Creative Thinkers, Cleverly Disguised as Engineers.
Material Savings• Reduction in Materials
from Stage 1 to Stage 3
– Concrete 6,000 Cu. Yds
– Rebar 3.2 M lbs
– Formwork 27,000 s.f.
• 15% reduction in total
structural materials
Stage 1 – Dual System
Stage 3 - PBD
7/17/2019 Design of a 35 Story Building in Los Angeles Using the LADBS Performance Based Design Methodology
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Summary
• Performance Based Design(PBD) better captures thecomplex sway effects of tallbuildings
• PBD directly addresses the levelof redundancy & safety of thebuilding structure
• PBD is a good alternative forowners to increase useablespace and reduce constructionmaterials.
• PBD takes advantage of
Leading Edge Design tools andmethods, and latest knowledgein tall building design.
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Creative Thinkers, Cleverly Disguised as Engineers.
Thank you!
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