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