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Section 2: SUPERSTRUCTURE DESIGN Design Parameters 1 03 General Notes 1 02 About this LRFD Flat Slab Bridge Design Example 1 01 Section 1: 

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LRFD Design Example #2:

Cast-in-Place Flat Slab Bridge Design

Click here for Table of Contents

2202 N. West Shore Blvd., Suite 250

Tampa, FL 33607

(813) 282-2300

Bent 2 Piles Vertical Load Design3.03

Bent 2 Cap Design3.02

Bent 2 Cap Design Loads3.01

Section 3: SUBSTRUCTURE DESIGNExpansion Joint Design2.05

Edge Beam Design2.04

Edge Beam Design Loads2.03

Flat Slab Design2.02

Design Loads2.01

Section 2: SUPERSTRUCTURE DESIGNDesign Parameters1.03

General Notes1.02

About this LRFD Flat Slab Bridge Design Example1.01 Section 1: PROJECT INFORMATIONCoverTable of Contents

LRFD DESIGN EXAMPLE:

CAST-IN-PLACE FLAT SLAB BRIDGE DESIGN

LRFD DESIGN EXAMPLETable of Contents1 of 1

Since this example is presented in a

Mathcad document, a user can alter assumptions,

constants, or equations to create a customized application.Load rating is not addressed. Permit vehicles are not considered. No sidewalks. Two traffic railing barriers and one median barrier. No phased construction. 30 degree skew Three span continuous @ 35'-0" each for a total of 105'-0" bridge length The following assumptions have been incorporated in the example:

Intermediate bent cap design Expansion Joint design Edge Beam design Solid c.i.p. slab design The example includes the following component designs:

This document provides guidance for the design of a cast-in-place flat slab bridge.

DescriptionAbout this Design Example

SUPERSTRUCTURE DESIGN

PROJECT INFORMATION1.01 About this Design Example1

The materials in this document are only for general information purposes. This document is not a substitute for

competent professional assistance. Anyone using this material does so at his or her own risk and assumes any

resulting liability.NoticeThe Tampa office of HDR Engineering, Inc. prepared this document for the Florida Department of

Transportation.Acknowlegements GPa1109×Pa׺MPa1106×Pa׺°F1degºksi kip in

2ºksf

kip ft

2ºklf

kip ftºpsi lbf in

2ºpcf

lbf ft

3ºpsf

lbf ft

2ºplf

lbf

ftºkN1000newton׺NnewtonºDefinitions for some common structural engineering units:ton2000lbf׺kip1000lbf׺All calculations in this electronic book use U.S. customary units. The user can take advantage of Mathcad's unit

conversion capabilities to solve problems in MKS or CGS units. Although Mathcad has several built-in units,

some common structural engineering units must be defined. For example, a lbf is a built-in Mathcad unit, but a

kip or ton is not. Therefore, a kip and ton are globally defined as:Defined Units

Florida Department of Transportation Structures Detailing Manual for LRFD, 1999 Edition. Florida Department of Transportation Structures LRFD Design Guidelines, January 2003 Edition. AASHTO LRFD Bridge Design Specifications, 2nd Edition, 2002 Interims. Florida Department of Transportation Standard Specifications for Road and Bridge Construction

(2000 edition) and applicable modifications. The example utilizes the following design standards:

Standards

PROJECT INFORMATION1.01 About this Design Example2

All dimensions are in feet or inches, except as noted.Dimensions........................Concrete cover does not include reinforcement placement or fabrication

tolerances, unless shown as "minimum cover". See FDOT Standard Specifications for allowable reinforcement placement tolerances.Substructure

External surfaces exposed3"

External surfaces cast against earth4"

Prestressed Piling3"Superstructure

Top deck surfaces2" (Short bridge)

All other surfaces2"Concrete Cover.................ASTM A615, Grade 60Reinforcing Steel..............The superstructure is classified as slightly aggressive.

The substructure is classfied as moderately aggressive.Environment......................Class Minimum 28-day Compressive Strength (psi) LocationII f`c = 3400 Traffic Barriers

II (Bridge Deck) f`c = 4500 CIP Flat Slab IV f`c = 5500 CIP Substructure

V (Special) f`c = 6000 Concrete Piling Concrete............................

Seismic provisions for minimum bridge support length only

[SDG 2.3.1].Earthquake........................Design provides allowance for 15 psfFuture Wearing Surface...HL-93 TruckDesign Loading.................Load and Resistance Factor Design (LRFD) except that Prestressed Piles have

been designed for Service Load. Design Method.................General Notes

PROJECT INFORMATION

PROJECT INFORMATION1.02 General Notes3

D1. Intermediate Bent Geometry

D. Substructure16C5. MiscellaneousC4. Chapter 6 - Superstructure ComponentsC3. Chapter 4 - Superstructure ConcreteC2. Chapter 2 - Loads and Load FactorsC1. Chapter 1 - General requirementsC. Florida Criteria11B3. Limit States [LRFD 1.3.2]B2. Resistance Factors [LRFD 5.5.4.2]B1. Dynamic Load Allowance [LRFD 3.6.2]B. LRFD Criteria

8A3. Concrete, Reinforcing and Prestressing Steel PropertiesA2. Number of LanesA1. Bridge GeometryA. General Criteria5Page ContentsThis section provides the design input parameters necessary for the superstructure and substructure design.

DescriptionDesign Parameters

PROJECT INFORMATION

PROJECT INFORMATION1.03 Design Parameters4

A. General Criteria

This section provides the general layout and input parameters for the bridge example. In addition, the bridge is also on a skew which is defined as:

Skew Angle.........................Skew30-deg:=

A1. Bridge Geometry

Horizontal ProfileA slight horizontal curvature is shown in the plan view. For all component designs, the horizontal curvature will

be taken as zero. PROJECT INFORMATION1.03 Design Parameters5

Vertical Profile

Overall bridge length.............L

bridge105ft׺

Bridge design span length......L

span35ft×:=(Note: For unsymmetric spans, use average span length)

PROJECT INFORMATION1.03 Design Parameters6

E s29000ksi×:=Modulus of elasticity for reinforcing steel...................g

conc150pcf×:=Unit weight of concrete.........A3. Concrete, Reinforcing and Prestressing Steel PropertiesN

lanes3=N lanesfloorRdwywidth

12ft×aeçè

:=Number of design traffic lanes per roadway.........................Rdwy

width42ft×:=Roadway clear width............Current lane configurations show two striped lanes per roadway with a traffic median barrier separating the

roadways. Using the roadway clear width between barriers, Rdwy width , the number of design traffic lanes per roadway, N lanes , can be calculated as:Design LanesA2. Number of LanesW bridge89.0833ft×:=Overall bridge width.............Typical Cross-secton

PROJECT INFORMATION1.03 Design Parameters7

Load combinations which place restrictions on stress range as a result of a single design truck. It is

intended to limit crack growth under repetitive loads during the design life of the bridge.FATIGUE LIMIT STATELoad combinations which place restrictions on stress, deformation, and crack width under regular

service conditions.SERVICE LIMIT STATELoad combinations which ensure the structural survival of a bridge during a major earthquake or flood, or

when collided by a vessel, vehicle, or ice flow, possibly under scoured conditions. Extreme event limit

states are considered to be unique occurrences whose return period may be significantly greater than the

design life of the bridge.EXTREME EVENT LIMIT STATESLoad combinations which ensures that strength and stability, both local and global, are provided to resist

the specified load combinations that a bridge is expected to experience in its design life. Extensive distress

and structural damage may occur under strength limit state, but overall structural integrity is expected to be

maintained.STRENGTH LIMIT STATEThe LRFD defines a limit state as a condition beyond which the bridge or component ceases to satisfy the

provisions for which it was designed. There are four limit states prescribed by LRFD. These are as follows: B3. Limit States [LRFD 1.3.2]f

v0.90:=Shear and torsion of normal weight concrete...................f0.9:=Flexure and tension of reinforced concrete..............B2. Resistance Factorsquotesdbs_dbs3.pdfusesText_6