HomeMy WebLinkAboutShaw Condo Walkways_Engr Report_11-11-2021FDN Engineering, LLC
Date:
Project:
Address:
Helical Pier Foundation Support System Analysis
FDN Engineering, LLC
2412 N 179th St.
Omaha, NE 68116
(402) 739-9642
To the best of my professional knowledge, belief, and opinion, the design of the helical pier support system
meets the structural requirements of the 2020 Florida Building Code, Seventh Edition to the extent that it
applies to our scope of work. The helical pier foundation support system is not intended to be the primary
support system for the structure, rather a supplemental stabilization system.
Upon completion of foundation support system, the contractor shall supply engineer a log of the installed
locations, depth, and final torque of the helical piers. Engineer will evaluate the log and prepare a
completion report.
November 11, 2021
Shaw Condo Walkways
5051 N Hwy A1A
Fort Pierce, FL 34949
This report is prepared for Alpha Foundation Specialists (contractor) by FDN Engineering (engineer). Helical
piers are specified for installation at the above referenced project. The foundation support system is
intended to stabilize and potentially lift the existing foundation structure – reducing pressure on existing
soils. Load requirements for the helical piers were calculated at areas identified by the contractor. See page
2 for engineering analysis assumptions and results. See pages 3 and 4 for design information and details for
the helical pier foundation supports. See page 5 for a layout of the supports proposed by contractor on a
footprint of the structure.
Page 1 of 5
FDN Engineering, LLC
Project Assumptions (contractor to confirm assumptions):
1.
2.
3.
4.
5.
6.
7.
Analysis Notes and Results:
8.
9.
10.(allowable stress combinations).
11.
12.
13.
14.
15.
16.
17.
FDN Engineering, LLC
2412 N 179th St.
Omaha, NE 68116
(402) 739-9642
An installation torque of
Use W4x13 x 1'-0" long spreader beams on top of brackets as a shim. The beam pushes the bracket
lower beneath ground level.
should be applied to achieve an allowable capacity greater
than the total load. The allowable capacity of a pier in compression is based on the interaction of
3,200 ft-lbs
Maximum, worst-case, total load on a helical pier is
This item has been digitally signed and sealed by
When the product is installed in a soil where the conditions are considered corrosive to steel,
adequate protection to the exposed steel must be provided.
The capacity of the existing foundation and supported structure has not been checked and is
assumed to be adequate to transfer the design loads to the helical pier support system.
Helical piers are designed to support axial compression load only.
Minimum helical pier tip depth is 12 ft.
the brackets, shafts, helical plates, and soils.
A factor of safety of 2.0 is typically used to calculate the allowable soil bearing capacity.
Geotechnical testing information was not provided for this design.
Helical pier spacing along the foundation shall not exceed 8'-0" O.C. and 2-ft from a corner.
14,100 lbs
We recommend installation of piers with a 2-7/8” diameter shaft (HP287) with 8" and 10" diameter
(minimum) helix plates.
Roof and floor dead/live loads are based on guidance from the Florida Building Code.
Where voids are created below structure during lifting, fill with flowable cementitious material.
November 11, 2021
Chad A. Keller, P.E. on the date adjacent to the seal.
At helical piers, use spreader beams (W4x13, ASTM A992/A572 Grade 50). Use up to 5'-0" long
spreader beams to improve the footing's spanning capability by carrying load from the footing to
the pier. Typically, use below openings.
Printed copies of this document are not
considered signed and sealed and the signature
must be verified on any electronic copies.
The product is installed in undisturbed or uniformly placed and well-engineered fill soils. Pier is not
installed in recently backfilled sites, in bedrock soils, or where there is possible sinkhole activity.
Helical piers shall have a center-to-center spacing at the helix depth of at least three (3) times the
diameter of the largest helix plate.
Structure is walkway ramps/stairs adjacent to condominium.
Contractor will install helical piers, brackets, and all related components per the support
manufacturer’s current installation instructions and technical manual, and according to the latest
ICC-ES AC358.
Page 2 of 5
FDN Engineering, LLC
The above information is taken from Supportworks Technical Manual.
FDN Engineering, LLC
2412 N 179th St.
Omaha, NE 68116
(402) 739-9642
Printed copies of this document are not
considered signed and sealed and the signature
must be verified on any electronic copies.
This item has been digitally signed and sealed by
Chad A. Keller, P.E. on the date adjacent to the seal.
November 11, 2021 Page 3 of 5
FDN Engineering, LLC
The above information is taken from Supportworks Technical Manual.
FDN Engineering, LLC
2412 N 179th St.
Omaha, NE 68116
(402) 739-9642
Printed copies of this document are not
considered signed and sealed and the signature
must be verified on any electronic copies.
November 11, 2021
Chad A. Keller, P.E. on the date adjacent to the seal.
This item has been digitally signed and sealed by
Page 4 of 5
Notes:
1.
2.
3.Installation torque of 3,200 ft-lbs.
4.
5.
6.
DRAWING NOT TO SCALE
(402) 739-9642
Omaha, NE 681165051 N Hwy A1A Printed copies of this document are not
considered signed and sealed and the
signature must be verified on any electronic
copies.November 11, 2021
Fort Pierce, FL 34949
sealed by Chad A. Keller, P.E. on the date
adjacent to the seal.
Project:FDN Engineering, LLC
2412 N 179th St.Shaw Condo Walkways
Concrete & masonry walkway & stairs.
Layout of (29) Helical Piers, Model HP287
Do not place pier under wall opening without
spreader beams.
Install per helical pier manufacturer’s
instructions and technical specifications.
Notify engineer if design assumptions are
discovered inaccurate.
This item has been digitally signed and
for foundation support - 12'-0'' min depth.
Page 5 of 5
LEGEND:
Indicates Helical Pier
and Mark Number0
FOOTPRINT OF HANDICAP
ACCESS RAMP
22
24
23
25
26
28
27
29
1 2 3 4
9 10 11 12
6
7
8
5
13
18
20
19
21
STAIRS 4STAIRS 5 STAIRS 3
14
16
15
17
STAIRS 1STAIRS 2