PRECAST CONCRETE STRUCTURE DESIGN

Presented by:Ronald E. Thornton, PE

“We are a seamless extension of our clients’ organization”

DELTA OVERVIEW

About Delta:Offi i Bi h t NY d D lhi NY• Offices in Binghamton, NY and Delhi, NY

• Company Established in 1976p y

• 96 Total Employees

• ISO 9001 Certified

Ser ices• Services:

o Transportation, Facilities, Bridge and Precast Concrete Design Services

About Delta:T t ti D i• Transportation Design:

o Bridge and Highway Design Services for State DOT’s and Municipalitiesp

• Building Facility Design:o Mechanical Electrical Plumbing Site/Civil Environmentalo Mechanical, Electrical, Plumbing, Site/Civil, Environmental,

Architectural, Building Structural, Construction Administration, and Land Surveying

• Precast Design:o Specialty Design Services for Precast Concrete Industry

Precast Concrete Specialty ServicesO 800 P j t Y• Over 800 Projects per Year

• Over 100 Active Precast Clients

• Licensed in 44 States

Precast Concrete Engineering TeamJoe Mieczkowski PEJoe Mieczkowski, PE

Director of Precast Concrete Services

Daryl Burns, PEProject Manager

Ronald Thornton, PEProject Manager

Business Development

Stuart Gorka, PEProject Manager

Greg Shirhall

Justin Marshall, PEProject Engineer

Sallie Valentine, PESenior Engineer

Nathan Clark, EITEngineer

Larry Donahue

Kim Kvassay, EITAssistant Engineer

Senior EngineerLarry Donahue

Technician

Gerald Pagliah i i

Kris BrownAssistant Engineer

Assistant Engineer Technician

Typical Precast Projects• Vaults• Vaults• Manholes• PCC Frame Units (3-sided bridges)• Cantilever and Gravity Style Retaining Wallsy y g• Mechanically Stabilized Retaining Walls

Arch Bridges• Arch Bridges• Special Precast Sections• Light Pole Foundations

Typical Precast Projects – cont’dUtilit T l• Utility Tunnels

• Septic Tanks• Prestressed Beams• Conventionally Reinforced BeamsConventionally Reinforced Beams• Modular Buildings

C• Box Culverts• Noise Walls• Detention Systems

STANDARD DESIGN OVERVIEW

Traffic LoadsH20• H20

• HS20

• HS20-44 – AASHTO Standard Specification

• A-16 – ASTM C890, C857

HL 93 AASHTO LRFD Specification• HL-93 – AASHTO LRFD Specification

• Legal or Permit Loadsg

Live LoadsHS 20 (36 Ton Tr ck 16kip heel)• HS-20 (36 Ton Truck, 16kip wheel)

• HS-25 (45 Ton Truck, 20kip wheel)• HL-93

o Standard truck with a uniform lane load of 640 lbs/fto Dual tandem axles 4’ apart weighing 25,000 lbs each

plus a uniform lane load of 640 lbs/ft

P d t i• Pedestriano AASHTO 85psf

ASTM 300 fo ASTM – 300psf

Special LoadsAi ft FAA Ci l 150 5320 6• Aircraft – FAA Circular 150-5320-6

• Railroad – AREMA Cooper Seriesp

• Heavy Equipment

Design Methods:ASD/WSD All bl St D i M th d• ASD/WSD: Allowable Stress Design Method

oAKA Working Stress DesignWid l d til l 1970’oWidely used until early 1970’s

oAASHTO method Similar to ACI 318-63

Design Methods:LFD L d F t D i M th d•LFD: Load Factor Design Method

oIntroduced into AAHSTO Std. around 1970U i l d bi ti f d d lioUses various load combinations for dead, live,

wind, ice, etc.oBoth WSD and LFD are included in the StandardoBoth WSD and LFD are included in the Standard code.oSimilar to strength method of ACI 318 until 2005 gCode

Design Methods:LRFD L d d R i t F t D i• LRFD: Load and Resistance Factor Design

oIncorporated by AASHTO in 1993 based on TRB research started in 1986research started in 1986oIntended to provide a more uniform and consistent level for bridge safety under a wide variety of loadlevel for bridge safety under a wide variety of load and resistance models.oBased on statistical reliability of any structural element exceeding a given limit state.oMany differences in methodology from both AASHTO St d d d t ACI 318AASHTO Standard and current ACI 318

Differences:AASHTO St d d AASHTO LRFD• AASHTO Standard

o16 kip Wheel4+ 06S

• AASHTO LRFDo32 kip Axle with lane load or tandem axleoe = 4+.06S

oLL Surcharge .5% of wheel load

load or tandem axleoe = 96+1.44SoLL Surcharge 2wheel load

oSL Cracking ‘Z’ Value

oLL Surcharge, 2 Tables of valuesoSpacing limitation

o2 Limit StatesFactored

p goAt least 4 Limit States

Service

Typical Loading

Lateral Soil Loads

Live Load Surcharge - LRFD

Items that Impact Lateral Soil Load:E th C• Earth Cover

• Water Table Location• Structure Composition (Layout)• Structure Composition (Layout)• Magnitude and Proximity of Surface Live Load

Traffic Rated Hatches

Traffic Rated Hatches

Questions ?

Contact Information

Delta Engineers184 Court St184 Court St

Binghamton, NY 13901607-231-6600607 231 6600

Fax 607-231-6650www.deltaengineers.comwww.deltaengineers.com

rthornton@deltaengineers.com