HomeMy WebLinkAboutCB 98-1978; LA COSTA DE MARBELLA; STRUCTURAL CALCULATIONS FOR THE BACK WALL; 1998-05-15STRUCTURAL CALCULATIONS
FOR TIE BACK WALL AT
LA COSTA DE MAR]3ELLA
CLIENT: LA COSTA DE MARBELLA HOA
LA COSTA AVENUE
CARLSBAD, CA
TABLE OF CONTENTS
Introduction/Loads
Vertical Span
Horizontal Span
Shear
Anchor Bond Length
Dywidag Multistrand Prestressing Steel Properties Table
.000
I?a* 40
Sheet 1
Sheet 2-3
Sheet 4
Sheet 5
Sheet 6
Sheet 7
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May 15, 1998
CR000233 Project Ref.: 961317-2
5575 MAGNATRON BLVD., SUITE H, SAN DIEGO, CALIFORNIA 92111
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( Double Corrosion Protection DCP (Type C)
- Corrosion protection for the anchor tendon can be
2 improved by extending the outer corrugated PE or
PVC duct over the free stressing length. In this
case, pregrouting of the anchor inside the plastic
duct is not recommended because of difficulties
which might be encountered during transportation
and placing.
Double Corrosion Protection DCP (Type D)
The ideal protection for strand anchors is one in
which the strand is totally and permanently pro-
tected from the time of manufacture throughout its
life. Such protection is provided by epoxy coating
the individual strands both externally and internally
Flo-bond Flo-fil® is a rugged, thermally bonded
polymer coating that offers maximum corrosion
protection, with a bond strength that exceeds that
of bare strand. When two stage grouting is used,
no additional corrosion protection is required even
in applications where the free stressing length will
remain ungrouted for an extended period of time.
The Dywidag wedge anchor for epoxy coated
strand bites through the coating into the strand,
developing 100% of its nominal ultimate tensile
strength. Corrosion protection provided by the
epoxy is not compromised by the wedge.
Although the cost of epoxy coated strand is higher
than bare strand, the total cost of the installed
anchor is reduced by eliminating the outer corru-
gated plastic duct. This makes it possible to mini-
mize the drill hole size, thereby reducing the cost of
drilling and grouting.
Double Corrosion Protection DCP (Type E)
For anchors in which single stage grouting is
desirable, the free stressing length of epoxy coat-
ed strand anchors can be coated with a lubricat-
ing grease and encased in a seamless extruded
PE sheath.
3
Multistrand Prestressing Steel Properties - ASTM A416
Anchor
Size
Nominal
Cross Section
Area
Nominal
Weight
(bare strand)
Ultimate
Strength
(Fpu Aps)
Prestressing Force
0.80 Fpu A 5 0.70 Fpu Aps 0.60 Fpu
in2 mm pit kg/rn kips kN kips kN kips kN kips kN
3 -0.6 0.65 420 2.20 3.27 175.8 782 140.6 625 123.0 547 105.5 469
4 -0.6 0.87 560 3.00 4.46 234.4 1,043 187.5 834 164.1 730 140.6 626
5 -0.6 1.09 700 3.70 5.51 293.0 1,303 234.4 1.043 205.1 912 175.8 782
6 -0.6 1.30 840 4.40 6.55 351.6 1,564 281.3 1,251 246.1 1,095 211.0 938
7 -0.6 1.52 980 5.20 7.74 410.2 1,825 328.2 1,460 287.2 1,277 246.2 1.095
8 -0.6 1.74 1.120 5.90 8.78 468.8 2,085 375.0 1,668 1 328.1 1,460 281.3 1,251
9 -0.6 1.95 1.260 6.70 9.97 527.4 2,346 421.9 1,877 369.2 1,642 316.4 1.408
12 -0.6 2.60 1.680 8.90 13.24 703.2 3.128 562.6 2,503 492.3 2.190 422.0 1,877
15 -0.6 3.26 2.100 11.10 16.52 879.0 3.910 703.2 3,128 615.3 2,737 527.4 2.346
19 -0.6 4.12 2,660 14.10 20.98 1,113.4 4.953 890.7 3,962 779.4 3,467 668.0 2.972
27 -0.6 5.86 3,780 20.00 29.76 1,582.2 7,038 1,265.8 5,631 1,107.6 4.927 949.4 4,223
37 -0.6 8.03 5.180 27.40 40.78 2,168.2 9,645 1,734.6 7,716 1,517.8 6,751 1,301.0 5.787
48 -0.6 10.41 6,720 35.50 52.83 2,812.8 12,512 2,250.2 10,009 1,968.9 8,758 1,687.7 7,507
54 -0.6 11.72 7,560 39.90 59.38 3,164.4 14,076 2,531.5 11,261 2,215.1 9,853 1,898.6 8,446
61 -0.6 13.24 8,540 45.10 1 67.12 3,574.6 15,901 2,859.7 12,721 2,502.2 11,131 2,144.8 9,540
11