Prestressed Concrete Design Example

11/27/2021by admin
  1. Prestressed Concrete Design Manual
  2. Prestressed Concrete Pile Design Example

See also: › Prestressed concrete nc › Prestressed concrete sc › Prestressed concrete tn › Prestressed concrete aci › Prestressed concrete ppt › Prestressed concrete .pdf

  • The modular ratio of reinforcing to concrete should be rounded to the nearest whole number. An exception is made for prestressed members where the modular ratio is rounded to two places in this example. Precast Box Beam 7.46 3818 28,500 n = = Use n = 7.46 for Prestressing in Beam at Transfer 7.00 4070 28,500.
  • Sl.No Contents Page No. PRESTRESSED CONCRETE STRUCTURES UNIT I - THEORY AND BEHAVIOUR 1.1 Pre-stressed concrete 2 1.2 Types of pre-stressing 2 1.3 Losses 3 UNIT II - DESIGN CONCEPTS 2.1 Analysis of beam section - concept 18 2.2 Elastic Design for flexure 38 2.3 Permissible stresses for flexure member 41 2.4 End block 54 UNIT III CIRCULAR.

To exchange experience in the design of torsion-critical structures as well as new research insights on torsion, Joint ACI-ASCE Committee 445 and Subcommittee 445-E organized two sessions titled “Examples for the Design of Reinforced and Prestressed Concrete Members under Torsion” at the ACI Fall Convention 2020. DESIGN EXAMPLE 1 This example illustrates the design of an interior and exterior beam of a precast prestressed concrete beam bridge using fully prestressed beams with harped bonded strands in accordance with the AASHTO LRFD Bridge Design Specifications, Third Edition, Customary US Units and through the 2005 Interims. Eurocodes Prestressed Concrete Beam Design Example Author: www.solnft.net-2021-10-04-03-30-00 Subject: Eurocodes Prestressed Concrete Beam Design Example Keywords: eurocodes,prestressed,concrete,beam,design,example Created Date: 10/4/2021 3:30:00 AM.

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Prestressed Concrete Pile Design Example

Home‎ > ‎Design Example, Posttensioned Bridge Girder‎ > ‎

Bridge Geometry and Materials

Bridge Superstructure Geometry

ElementParameter name in templateValue in exampleUnitValue in templateUnit
Thickness of deck slabTdc6in
0.152
m
Thickness of wearing course
Twc2in
0.0508
m
Railing
average width
height

Wr
Hr

n/a
n/a

n/a
n/a

Footpath
average width
height

Wfp
Hfp

n/a
n/a

n/a
n/a

Median strip
width
height

Wms
Hms

n/a
n/a

n/a
n/a

Cross-girder/Diaphragm
thickness
height
quantity

Tcg
Hcg
Ncg

8
3.167
3

in
in

0.2032
0.9652
3

m
m
Span lengthSp95ft28.956m
OverhangOHn/an/a
Girder spacingCC6ft
1.8288
m



Girder Dimensions
DesignationParameter name in templateValue in example (in)Value in template (mm)
aa22558.8
bb8203.2
cc7177.8
dd7177.8
ee38965.2
ff8203.2
gg376.2
hh376.2
ii541371.6
jj6152.4
width at end sectionWidth_end22558.8

Figure 2b - Girder dimensions in example 16-3
Note: Figure 1b above shows the section used in the example. The I-shaped precast girder's top flange incorporates the slab.



Tendon no.Distance from bottom at mid-section, in [mm]Distance from bottom at end section, in [mm]
12 [50.8]14 [355.6]
22 [50.8]22 [558.8]
32 [50.8]6 [152.4]
42 [50.8]22 [558.8]
52 [50.8]14 [355.6]
65 [127]30 [762]
75 [127]38 [965.2]
85 [127]38 [965.2]
95 [127]30 [762]
108 [203.2]46 [1168.4]
118 [203.2]46 [1168.4]
Note: Distances in mm are values used in the template.
Center of gravity of tendon from the bottom, cg = 4.2 in (106.7 mm) [106.2 mm]a,b







Materials

Concrete Strength

Prestressed girders

Specified compressive strength of concrete at time of initial loading or prestressing, f'ci (fc_iGirder)c = 4000 psi (28 MPa)a
Specified compressive strength of concrete after 28 days, f'c(fc_Girder)c = 4500 psi (31 MPa)a

Deck slab

Specified compressive strength of concrete after 28 days, f'c(fc_Slab)c = 4500 psi (31 MPa)a

Concrete Unit Weight

For computing Ec:Unit weight, γiConcrete(w_co)c = 0.145 kcf [23 kN/m3]a(Table 3.5.1-1)
For DL calculation: Unit weight, γConcrete(w_c)c = 0.150b kcf [24 kN/m3]a(Table 3.5.1-1 and C.5.1)

Concrete Elastic Modulus



Modulus of elasticity of concrete at transfer, Eci(Ec_igirder)c = [25,664.82 MPa]a,b
Modulus of elasticity of concrete, Ec(Ec_girder)c = 4,000,000 psi (27.6 kPa) [27,004.75 MPa]a,b

Deck slab

Modulus of elasticity of deck concrete, Ec deck(Ec_slab)c = 4,000,000 psi (27.6 kPa) [27,004.75 MPa]a,b

Wearing Course

Unit weight of wearing course, γWC (w_wc)c= 0.150 kcf [24 kN/m3]a

Reinforcing Steel

Specified minimum yield strength of reinforcing bars, fy (f_y)c = 40 ksi [275 MPa]a(5.4.3.1)
Modulus of elasticity of reinforcing bars, Es = 28,000,000 psi [193,053 MPa](5.4.3.2)

Prestressing Strands

0.196' uncoated, stress-relieved wire confirming toAASHTO M204 (ASTM A421)

Area of prestressing steel, Aps (NomArea_cable)c = 0.0302b in2 [19.48 mm2]a,b
Specified tensile strength of prestressing steel, fpu (f_pu)c = 250,000 psi [1,720 MPa]a (Table 5.4.4.1-1)
Yield strength of prestressing steel, fpy = 200,000 psi (1,379 MPa)
Assuming use of prestressing steel other than low-relaxation strand,
fpy (f_py)c = 0.85 fpu = 212,500b psi [1,462 MPa]a,b(Table 5.4.4.1-1)
Modulus of elasticity of prestressing tendons, Ep (E_p)c =
28,000 ksi [193,053 MPa]a (5.4.4.2)

bComputed value
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