sps deck system - texas a&m university · – design with both concrete deck and sps as an...

Annual Transportation Short Course — Structures and Hydraulics October 24, 2015

SPS DECK SYSTEM for Truss Rehabilitation


Table of Contents

2

7–10

11–15

16–31

3–6 What is SPS?

History

Where in the World?

Texas

1

2

3

4


What is SPS?

Sandwich plate system

3

Source: https://commons.wikimedia.org/wiki/File:SPS-Sandwich_Plate_System-_Sample.jpg

Polyurethane

core

Steel plates


What is SPS?

Thickness

Weight

4

SPS Sizes Steel (in.) - Polyurethane (in.) - Steel (in.)

3/8-1-3/8 (1 ¾″)

7/16-1-7/16 (1 ⅞″)

1/2-1-1/2 (2″)

Material Weight

Concrete (8″ thick) ~100 psf

SPS (2″) ~45 psf


Where in the World

Europe

Canada

US

Asia

5

Source: http://www.vectortemplates.com/raster/maps-world-map-01.png


History

Naval

6

Source: Intelligent Engineering Project Portfolio


History

Stadia

7



History

Buildings

8



History

Industrial

9



History

Bridges – New construction (County Road over Martin Branch, also known as

Center Creek)

10

Source: AASHTO SPS Webinar July, 2015


History

Bridges – New construction (County Road over Martin Branch, also known as

Center Creek)

11

Source: AASHTO SPS Webinar July, 2015


History

Bridges – Redecking (Dawson Bridge — Edmonton, Canada)

12



History

Bridges – Redecking (Dawson Bridge — Edmonton, Canada)

13



Texas

Proposed truss rehabilitation – SH 174 over the Brazos River

14

3-span continuous deck truss Built in 1950 Functionally obsolete Structurally deficient


Texas

Functionally obsolete – Roadway width 26 feet

Structurally deficient – “Corbel” supporting approach slabs

controls rating

15


Texas

Increase roadway width to 28 feet

New 8-inch thick deck will still keep the structure structurally deficient

– Most gusset plates would have to:

• Receive extra plates

• Rivet replacement

16


Texas

SPS – Decreases the deck dead load by over 50%

• Eliminates the need for gusset plates to receive supplementary plates • Substantially decreases the number of gusset plates needing

rivet replacement

17


Texas

18

Bridge deck will be replaced by phased construction.

*Assumes a 15-man crew for each deck type.

Deck Type Man Hours/SF *

2″ SPS 1.9

8″ Concrete 3.9


Texas

19

Panel connection details Source: Intelligent Engineering Project Portfolio


Texas

20

Curb connection details: – Thru-bolted – Welded DBRs or

headed studs

Types of rails used: – Steel post and beam – Concrete

TxDOT type T1F shown


Texas

21

Expansion joint connection details


Texas

22

Drain details


Texas

23

Source: http://www.concretebridgeviews.com/i75/Article2.php

Wearing surface — Multi-layer P\polymer overlay (MLPO) per TxDOT standard specification item 439, “Bridge Deck Overlays”

– Epoxy with aggregate “overlay”

– Thickness is generally 3/8″

– Replacement cycle between 5 to 10 years (depending on product)

– Ease of application • Temperature range 32⁰F to 104⁰F • Clean surface to product specifications • Apply primer • Apply resin (pot life of 15 to 20 minutes) • Broadcast aggregate • Apply sealant (product dependent)


Texas

24

Sizing One way span to depth ratio for SPS

Minimum girder depth calculated from AASHTO LRFD Table 2.5.2.6.3-1 – Depth = 0.033 x span (simple spans)

SPS Deck Size (in-in-in) Girder/Stringer Spacing (ft)

3/8–1–3/8 6–7

7/16–1–7/16 7.5–9

1/2–1–1/2 9.5–11


Texas

25

Grading

SPS adaptable to any cross slope or superelevation; transitions handled panel to panel to panel with discrepancies taken up in wearing surface


Texas

26

Distributors

Currently one distributor in the US located in Ohio

At least one more added to the US by the end of 2015

Due to cost, use on off system bridges might be cost prohibitive

Likely approach:

– Design with both concrete deck and SPS as an alternate

– Compared to SPS, concrete deck will

• require gusset plate strengthening or replacement

• rivet or bolt replacement

• longer construction duration

• ready-mix concrete availability could be a hindrance

Annual Transportation Short Course — Structures and Hydraulics October 24, 2015 27

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sps deck system - texas a&m university · – design with both concrete deck and sps as an...

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