Northside Piers Brooklyn, NY Structural System Redesign Jeremiah - - PowerPoint PPT Presentation

▶
northside piers brooklyn ny
SMART_READER_LITE
LIVE PREVIEW

Northside Piers Brooklyn, NY Structural System Redesign Jeremiah - - PowerPoint PPT Presentation

Jan 31, 2023 300 likes •580 views

Northside Piers Brooklyn, NY Structural System Redesign Jeremiah Ergas AE 482 5 th Year Senior Thesis Structural Option April 15 th , 2008 Faculty Consultant: Dr. Ali Memari Presentation Outline Intro Intro Building

slide-1
SLIDE 1

Jeremiah Ergas AE 482 – 5th Year Senior Thesis Structural Option April 15th, 2008 Faculty Consultant: Dr. Ali Memari

Northside Piers – Brooklyn, NY

Structural System Redesign

slide-2
SLIDE 2

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline

Intro

slide-3
SLIDE 3

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline Building Background – Location

North East United States Manhattan Northside Piers - 4 North 5th Street, Brooklyn, NY Building Background

slide-4
SLIDE 4

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline Building Background - Architecture

  • 29 Story Condominium Tower
  • 176 units
  • Two typical floor plans

(7500SF and 6200SF)

  • Glass Cladding System that allows

for floor to ceiling views

  • No drop ceiling over living spaces

Building Background

slide-5
SLIDE 5

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline Building Background – Structural System

  • Flat plate two-way mild reinforced slab
  • Irregular Column Scheme
  • Shear Walls around central core with

additional wall Building Background

slide-6
SLIDE 6

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline Redesign Goals

  • Floor Slab System - Mild reinforced vs. Post-Tensioned?
  • Shear Wall System - More optimal layout?

Structural Elements Studied

  • Construction Management
  • Acoustics
  • Mechanical Exhaust Risers

Other Disciplines Considered

  • Make structure more cost effective
  • Meet or improve serviceability of structure

Redesign Goals Redesign Goals

slide-7
SLIDE 7

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline

3rd–25th Floor 26th–Roof

Slab Design - Introduction

  • Make slab more cost effective
  • Meet or improve serviceability of structure

Slab Redesign Goals

  • No room for beams
  • Tendons improve slab efficiency
  • Tendons reduce deflections

Why Post-Tensioned System?

  • RAM Concept with Post-Tensioned spreadsheets
  • Must meet ACI318-05

Design Method

  • 60psf Live
  • 15psf Super
  • 40psf Live
  • 30psf Super

Design Loads (Floor) Design Loads (Balconies) Slab Design

slide-8
SLIDE 8

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline

3rd–25th Floor 26th–Roof

Slab Design – Current System

  • 8” Slabs with #5’s @ 12” o/c on Top and Bottom going both ways
  • Additional bars added as shown on plan

3rd–25th Floor Typical Slab 26th-Roof Typical Slab Slab Design

slide-9
SLIDE 9

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline

3rd–25th Floor 26th–Roof

Slab Design – Current System

3rd–25th Floor Long-Term Deflection 26th-Roof Long-Term Deflection Maximum Long-Term Deflection: 0.67” Maximum Long-Term Deflection: 0.74” ACI318 Limit (30’ Span): L/480 = 0.75” Slab Design

slide-10
SLIDE 10

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline

3rd–25th Floor 26th–Roof

Slab Design – Post-Tensioned System

3rd–25th Floor Tendon Plans 26th-Roof Tendon Plans Maximum Long-Term Deflection: 0.48” Maximum Long-Term Deflection: 0.49” Slab Design Column Shifted Column Added

slide-11
SLIDE 11

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline

3rd–25th Floor 26th–Roof

Slab Design – Post-Tensioned System

  • 7” Slabs
  • ½” Unbonded Tendons
  • Typical Profile heights of 5.75” and 1.25”
  • Typically #4 bars @ 24”o/c at bottom, both ways
  • Top reinforcing at columns and walls

Design Details

  • 35% Banded tendon Load-Balancing Percentage
  • 40% Uniform tendon Load-Balancing Percentage
  • Maximum P/A of 320psi

Tendon Stress Slab Design

slide-12
SLIDE 12

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline

3rd–25th Floor 26th–Roof

Slab Design – Comparisons/Conclusions

Serviceability Comparison

  • Maximum Long-Term Deflections reduced by about 30%
  • Both slabs meet the IBC requirement for a 2-hr fire rating
  • The difference in Sound Transmission Level is almost imperceptible (57-56)

Cost Comparison Slab Design

  • $36,000 will be saved if the story height is decreased by 1”
slide-13
SLIDE 13

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline

3rd–25th Floor Original Shear Walls

Viewed from South West

Shear Wall Design - Introduction

  • Make shear walls more cost effective
  • Meet or improve serviceability of structure

Shearwall Redesign Goals

  • Wind Loads were found from a wind tunnel test
  • Wind produced base moments almost twice that of seismic

Lateral Loads

  • ETABS with shear wall spreadsheets
  • Must meet ACI318-05

Design Method

  • Story Drift must be less than L/600
  • Building acceleration must be less than 15 milli-g

Serviceability Issues Shear Wall Design

slide-14
SLIDE 14

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline Shear Wall Design – Current Layout

Original Shear Walls

Viewed From South West

Original Shear Walls

Viewed From North East

Original Shear Walls Plan 3rd–25th Floor Original Shear Walls

Viewed from South West

  • 8ksi concrete below 14th floor
  • 6ksi concrete above 14th floor

Design Information

  • Total deflection: 3.80” (H/1004)
  • Torsional deflection: 2.82 milli-rad
  • Max story drift: H/759

Serviceability Shear Wall Design

slide-15
SLIDE 15

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline

3rd–25th Floor Original Shear Walls

Viewed from South West

Shear Wall Design – Considered Layouts

Modified Original Additional Wall Shortened Wall Opposite Wall Only Core Only Shear Wall Design

slide-16
SLIDE 16

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline

3rd–25th Floor Original Shear Walls

Viewed from South West

Shear Wall Design – Considered Layouts

Shear Wall Design

slide-17
SLIDE 17

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline

3rd–25th Floor Original Shear Walls

Viewed from South West

Shear Wall Design – Alternate Layout

Original Shear Walls

Viewed From South West

Original Shear Walls

Viewed From North East

Original Shear Walls Plan

  • Total deflection: 3.81” (H/1002)
  • Torsional deflection: 2.49 milli-rad

Serviceability Shear Wall Design

slide-18
SLIDE 18

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline

3rd–25th Floor Original Shear Walls

Viewed from South West

Shear Wall Design – Comparison/Conclusions

Serviceability Comparison

  • New layout reduced torsional deflections by 12%
  • Both layouts have equivalent total deflections and story drifts

Cost Comparison Shear Wall Design

slide-19
SLIDE 19

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline Construction Management – Schedule Comparison

Schedule Comparison Construction Management

slide-20
SLIDE 20

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline Construction Management – Schedule Comparison

Schedule Comparison Construction Management

slide-21
SLIDE 21

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline Construction Management – Construction Issues

Typical Floor Plan (Ground-11th Floor) Construction Management

slide-22
SLIDE 22

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline Overall Conclusions

Post-Tensioned Slab New Shear Wall Layout Serviceability Exceeded? More Cost Effective?

  • 30% less long

term deflection 20% Cheaper

  • 12% less torsional

deflection 5% Cheaper

  • Overall Conclusions
slide-23
SLIDE 23

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline Acknowledgements

Thanks to: McLaren Engineering Toll Brother’s Inc. FxFowle Architects

  • Dr. Ali Memari

The entire AE Department Faculty and Staff All of the practitioners who participated in the discussion boards All my friends and family The Class of 2008 Acknowledgements

slide-24
SLIDE 24

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline

Any Questions???

slide-25
SLIDE 25

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline

Existing Ceiling Link Beam Height: 7’-9” Reduction due to thinner slab: 1” Reduction for shear walls: 3” Potential New Ceiling Link Beam Height: 7’-5” New York City Limit: 7’-0” (Gives 5” for finishes)

slide-26
SLIDE 26

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline

slide-27
SLIDE 27

Intro Building Overview Redesign Goals Slab Design Shear Wall Design Construction Management Conclusions Acknowledgements Questions???

Presentation Outline