Distinguished Speaker Series, Spring 2007 Presentation Outline - - PowerPoint PPT Presentation

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Distinguished Speaker Series, Spring 2007 Presentation Outline - - PowerPoint PPT Presentation

Oct 28, 2022 226 likes •507 views

John Pillar John Pillar Hampton Inn & Hampton Inn & Suites Suites National Harbor, Md Md National Harbor, Advisor: Dr. Memari Memari Advisor: Dr. Distinguished Speaker Series, Spring 2007 Presentation Outline Presentation

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SLIDE 1

John Pillar John Pillar Hampton Inn & Hampton Inn & Suites Suites National Harbor, National Harbor, Md Md Advisor: Dr. Advisor: Dr. Memari Memari

Distinguished Speaker Series, Spring 2007

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SLIDE 2

Presentation Outline Presentation Outline

  • Existing Conditions

Existing Conditions

  • Proposal

Proposal

  • Structural Depth

Structural Depth – – PT Slab Investigation PT Slab Investigation

  • Construction Breadth

Construction Breadth – – Cost and Construction Cost and Construction Impact Impact

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SLIDE 3

Presentation Outline Presentation Outline

  • Existing Conditions

Existing Conditions

  • Proposal

Proposal

  • Structural Depth

Structural Depth – – PT Slab Investigation PT Slab Investigation

  • Construction Breadth

Construction Breadth – – Cost and Construction Cost and Construction Impact Impact

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SLIDE 4
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SLIDE 5

Typical Floor Typical Floor

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SLIDE 6

Existing Conditions Existing Conditions

  • 10

10-

  • 1/2

1/2” ” Concrete flat plate with 2 Concrete flat plate with 2-

  • 1/2

1/2” ” drop drop panels panels

  • 12

12” ”x24 x24” ” columns columns

  • Spread footing foundations

Spread footing foundations

  • Concrete shear wall lateral force resisting system

Concrete shear wall lateral force resisting system

  • 11 stories above grade

11 stories above grade

  • 10

10’ ’-

  • 3

3” ” typical floor to floor height typical floor to floor height

  • Designed under IBC 2003

Designed under IBC 2003

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SLIDE 7

Presentation Outline Presentation Outline

  • Existing Conditions

Existing Conditions

  • Proposal

Proposal

  • Structural Depth

Structural Depth – – PT Slab Investigation PT Slab Investigation

  • Construction Breadth

Construction Breadth – – Cost and Construction Cost and Construction Impact Impact

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SLIDE 8

Presentation Outline Presentation Outline

  • Existing Conditions

Existing Conditions

  • Proposal

Proposal

  • Structural Depth

Structural Depth – – PT Slab Investigation PT Slab Investigation

  • Construction Breadth

Construction Breadth – – Cost and Construction Cost and Construction Impact Impact

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SLIDE 9

New Proposal New Proposal

  • Replace original 10

Replace original 10-

  • 1/2

1/2” ” normally reinforced slab with normally reinforced slab with thinner post thinner post-

  • tensioned slab

tensioned slab

  • lower seismic base shear

lower seismic base shear

  • more economical system

more economical system

  • Examine behavior:

Examine behavior:

  • new lateral response

new lateral response

  • punching shear conditions, slab deflection

punching shear conditions, slab deflection

  • Footings, lateral force resisting system

Footings, lateral force resisting system

  • Analyze new cost and schedule associated with flooring

Analyze new cost and schedule associated with flooring system switch system switch

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SLIDE 10

Presentation Outline Presentation Outline

  • Existing Conditions

Existing Conditions

  • Proposal

Proposal

  • Structural Depth

Structural Depth – – PT Slab Investigation PT Slab Investigation

  • Construction Breadth

Construction Breadth – – Cost and Construction Cost and Construction Impact Impact

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SLIDE 11

Presentation Outline Presentation Outline

  • Existing Conditions

Existing Conditions

  • Proposal

Proposal

  • Structural Depth

Structural Depth – – PT Slab Investigation PT Slab Investigation

  • Construction Breadth

Construction Breadth – – Cost and Construction Cost and Construction Impact Impact

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SLIDE 12

PT slab is more economical PT slab is more economical

  • Slimmer slab profile (8

Slimmer slab profile (8” ” vs. 10.5

  • vs. 10.5”

”) )

  • Punching shear predicted to be ok

Punching shear predicted to be ok

  • Banded tendons spanning East

Banded tendons spanning East-

  • West

West

  • Uniform tendons spanning North

Uniform tendons spanning North-

  • South

South

  • Loading:

Loading: 40 40 psf psf (live) (live) 100 100 psf psf (dead) (dead) 28 28 psf psf (partitions, (partitions, m/e/p m/e/p) ) 168 168 psf psf

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SLIDE 13

Column Adjustments Column Adjustments

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SLIDE 14

Tendon Profiles, Latitudinal Tendon Profiles, Latitudinal

  • 8

8” ” slab, cover requirements limit profile drape slab, cover requirements limit profile drape

  • Tendons calculated to balance 90% of the dead

Tendons calculated to balance 90% of the dead load load

  • 9 strands in exterior longitudinal spans

9 strands in exterior longitudinal spans

  • 12 strands in interior spans

12 strands in interior spans

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SLIDE 15

Tendon Profiles, Longitudinal Tendon Profiles, Longitudinal

  • 3 strands per tendon

3 strands per tendon

  • Tendons spaced at 3

Tendons spaced at 3’ ’-

0” ” to 4 to 4’ ’-

0” ” o.c

  • .c.

.

  • End profiles terminated at center of slab

End profiles terminated at center of slab

  • Coordinate with slab openings/penetrations

Coordinate with slab openings/penetrations

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SLIDE 16

PT investigation continued PT investigation continued

  • 12

12” ” x 24 x 24” ” columns adequate for punching shear columns adequate for punching shear in all locations in all locations

  • Punching shear was found to be ok for worst case

Punching shear was found to be ok for worst case column, column, φ φVc Vc=110k>Vu=57k =110k>Vu=57k

  • Long term deflection is within appropriate limits

Long term deflection is within appropriate limits

  • Maximum deflection:

Maximum deflection:

  • positive

positive – – 0.6 0.6” ”

  • negative

negative – – 0.2 0.2” ”

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SLIDE 17

Slab Stresses at Slab Stresses at Midspan Midspan

  • f

fb

b at jacking: 146

at jacking: 146 psi psi Allowable: 0.6f Allowable: 0.6f’ ’c ci

i=1800psi

=1800psi

  • f

ft

t at jacking:

at jacking: -

  • 292

292 psi psi Allowable: 3 Allowable: 3√ √f f’ ’c ci

i=164psi

=164psi

  • f

fb

b at service: 370

at service: 370 psi psi Allowable: 0.45f Allowable: 0.45f’ ’c=2250psi c=2250psi

  • f

ft

t at service:

at service: -

  • 780

780 psi psi Allowable: 6 Allowable: 6√ √f f’ ’c=424psi c=424psi

  • f

f’ ’c c=5000 =5000 psi psi

  • f

f’ ’c ci

i=3000

=3000 psi psi

  • All conditions meet code, slab is ok

All conditions meet code, slab is ok

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SLIDE 18

Other considerations Other considerations

  • Overall building weight reduced by 11%

Overall building weight reduced by 11%

  • Seismic base shear decreased by 11% with weight

Seismic base shear decreased by 11% with weight savings, from 594k to 530k savings, from 594k to 530k

  • lateral system redesign unnecessary

lateral system redesign unnecessary

  • 70k reduced axial load on worst case column, footings

70k reduced axial load on worst case column, footings were found to be same size or very similar were found to be same size or very similar

  • footing redesign unnecessary

footing redesign unnecessary

  • Wind drift decreased by 0.8

Wind drift decreased by 0.8” ”

  • Seismic drift decreased by 1.5

Seismic drift decreased by 1.5” ”

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SLIDE 19

Presentation Outline Presentation Outline

  • Existing Conditions

Existing Conditions

  • Proposal

Proposal

  • Structural Depth

Structural Depth – – PT Slab Investigation PT Slab Investigation

  • Construction Breadth

Construction Breadth – – Cost and Construction Cost and Construction Impact Impact

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SLIDE 20

Presentation Outline Presentation Outline

  • Existing Conditions

Existing Conditions

  • Proposal

Proposal

  • Structural Depth

Structural Depth – – PT Slab Investigation PT Slab Investigation

  • Construction Breadth

Construction Breadth – – Cost and Cost and Construction Impact Construction Impact

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SLIDE 21

Cost savings of $156,760 Cost savings of $156,760

  • Increased cost for stressing tendons & labor

Increased cost for stressing tendons & labor +$360,570 +$360,570

  • Decreased cost for rebar

Decreased cost for rebar

  • $111,800

$111,800

  • Decreased cost for slab

Decreased cost for slab

  • $380,000

$380,000

  • Other savings

Other savings

  • $25,530

$25,530

$ $156,760

156,760

This equates to a savings of approximately $172,100 after location and inflation are considered

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SLIDE 22

Cost savings of $156,760 Cost savings of $156,760

  • Increased cost for stressing tendons & labor

Increased cost for stressing tendons & labor +$360,570 +$360,570

  • Decreased cost for rebar

Decreased cost for rebar

  • $111,800

$111,800

  • Decreased cost for slab

Decreased cost for slab

  • $380,000

$380,000

  • Other savings

Other savings

  • $25,530

$25,530

$ $156,760

156,760

This equates to a savings of approximately $172,100 after location and inflation are considered

Savings equivalent: 24,586 engineering computation pads (200 page tablet)

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SLIDE 23

Schedule Changes Schedule Changes

  • +6.1 extra days per floor to place & stress

+6.1 extra days per floor to place & stress tendons tendons

  • 2.6 less days per floor for rebar placement

2.6 less days per floor for rebar placement

  • 2.5

2.5 less days per floor for slab placement labor less days per floor for slab placement labor =1 =1

  • 1 extra day per floor to change floor systems, 11

1 extra day per floor to change floor systems, 11 extra days total extra days total

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SLIDE 24

Conclusion Conclusion – – PT system PT system recommended recommended

  • Pros:

Pros:

  • eliminate drop panels

eliminate drop panels

  • max slab deflection =

max slab deflection = L/580 L/580

  • save

save $172,100 $172,100

  • decreased drift from

decreased drift from wind and seismic due wind and seismic due to less severe P to less severe P-

  • delta

delta effects effects

  • Cons:

Cons:

  • slab shrinks, cracks

slab shrinks, cracks due to due to prestress prestress

  • can be treated with

can be treated with pour stops pour stops

  • schedule elongated by

schedule elongated by 11 days 11 days

  • maintenance of

maintenance of tendons tendons

  • increased coordination

increased coordination needed needed

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SLIDE 25

Distinguished Speaker Series Distinguished Speaker Series

  • In case you missed it, encore showings will take

In case you missed it, encore showings will take place place tonight tonight at the following locations: at the following locations:

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SLIDE 26

Distinguished Speaker Series Distinguished Speaker Series

  • In case you missed it, encore showings will take

In case you missed it, encore showings will take place place tonight tonight at the following locations: at the following locations:

  • Bill Pickles

Bill Pickles’ ’ Tap Room Tap Room 10:00 pm 10:00 pm

  • The All American

The All American Rathskeller Rathskeller 10:30 pm 10:30 pm

  • The

The Phyrst Phyrst 11:00 pm 11:00 pm

  • Caf

Café é 210 West 210 West 11:30 pm 11:30 pm

  • The Saloon

The Saloon 12:00 am 12:00 am

  • Zeno

Zeno’ ’s Pub s Pub 12:30 am 12:30 am

  • The Shandygaff

The Shandygaff 1:00 am 1:00 am

  • Mad

Mad Mex Mex 1:30 am 1:30 am

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SLIDE 27

Thanks! Thanks!

  • OTO Development

OTO Development

  • Hope

Hope Furrer Furrer Associates, Inc. Associates, Inc.

  • All AE faculty

All AE faculty

  • Online thesis mentors, all options (even CM)

Online thesis mentors, all options (even CM)

  • Everyone else who was involved

Everyone else who was involved