Bridge Specifications Addendum 1.pdf
PDF 364 KB Posted
- Attached to
- Furnish FRP Bridge Materials
- Solicitation number
- 6100046207
- Issued by
- Union County, Pennsylvania
About this file
This document contains the specifications for a pre-fabricated pedestrian bridge made of Fiber Reinforced Polymer (FRP) composite materials, intended for a state contract opportunity. The bridge is specified to have a 55-foot span, a minimum 4-foot width, and must be designed as an FRP composite truss. The design must meet specific engineering criteria, including live load, wind load, seismic load, and serviceability requirements such as deflection and vibration limits. The materials, fabrication, and delivery requirements are also detailed. The bridge is to be delivered to R.B. Winter State Park in Mifflinburg, Pennsylvania, with the contractor providing assembly drawings and procedures as needed. The specifications indicate that DCNR, the contracting agency, is responsible for procuring information on the site and soil conditions, as well as designing the bridge abutments.
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PRE-FABRICATED BRIDGE AND DECK SPECIFICATIONS
1.0 GENERAL
1.1 SCOPE
These specifications are for a fully engineered pedestrian bridge of Fiber Reinforced
Polymer (FRP) composite construction and shall be regarded as minimum standards for design and construction as manufactured.
2.0 GENERAL FEATURES OF DESIGN
2.1 SPAN
Bridge span will be 55’-0” (total length) and shall be measured from each end of the bridge structure. If more than 12” are needed for bearing on each end this shall be added to the length of the bridge.
2.2 WIDTH
Bridge width shall be a minimum of 4’-0” clear and shall be measured from the inside face of structural elements at deck level.
2.3 BRIDGE SYSTEM TYPE
Bridge must be designed as a FRP Composite Truss Span
2.4 MEMBER COMPONENTS
All members shall be fabricated from pultruded FRP composite profiles and structural shapes as required.
2.5 CAMBER
Bridge can be precambered to eliminate initial dead load deflections.
3.0 ENGINEERING
Structural design of the bridge structure shall be performed by or under the direct supervision of a Licensed Professional Engineer, registered in the Commonwealth of
Pennsylvania and done in accordance with recognized engineering practices and principles.
3.1 UNIFORM LIVE LOAD
Bridge shall be designed for 85 psf.
3.2 WIND LOAD
The bridge shall be designed for a minimum wind load of 75 psf. The wind is calculated on the entire vertical structure of the bridge as if fully enclosed.
3.3 SEISMIC LOAD
Seismic loads shall be determined according to the criteria specified in the standard building codes (IBC 2002, ASCE 7-02, BOCA, SBC or UBC) unless otherwise requested.
Response Spectrum Analysis shall be performed in those designs that require complex seismic investigation. All necessary response spectra information will be provided by the client for evaluation.
3.4 STRUCTURAL DESIGN CALCULATIONS
A complete set of structural calculations shall be submitted for review and approval. The calculations shall be sealed by a Professional Engineer registered in the Commonwealth of Pennsylvania.
3.5 SERVICEABILITY CRITERIA
Service loads are used for the design of all structural members when addressing deflection and vibration issues. Criteria used by Bidder in the design of FRp bridges should be as follows:
Deflection:
Live Load (LL) deflection = L/240
Vertical Frequency (fn): = 5.0 Hz
The fundamental frequency of the pedestrian bridge (in the vertical direction) without live load should be greater than 5.0 hertz (Hz) to avoid any issues with the first and second harmonics.
Horizontal Frequency (fn): = 3.0 Hz
The fundamental frequency of the pedestrian bridge (in the horizontal direction) without live load should be greater than 3.0 hertz (Hz) to avoid any issues due to side to side motion involving the first and second harmonics.
3.6 SNOW LOAD
Sustained snow load conditions shall be evaluated for time dependent effects (creep and relaxation) and expected recovery behavior.
4.0 MATERIALS
4.1 FRP COMPOSITES
FRP bridge shall be fabricated from high-strength E-glass and isophthalic polyester resin unless otherwise specified.
Weathering and ultraviolet light protection shall be provided by addition of a veil to the laminate construction with a minimum of 0.4 pounds/cubic foot. Minimum material strengths and properties are as follows:
Tension 33,000 psi Compression 33,000 psi Shear 4,500 psi Bending 33,000 psi Young’s Modulus 2,800,000 psi
The minimum thickness of FRP Composite shapes shall be as follows unless otherwise specified: Square tube members (closed type shape) shall be 0.25 in. Wide-flange beams, channel sections, and angles (open type shapes) shall be a minimum thickness of
0.25 in. Standard plate shall be a minimum thickness of 0.25 in.
4.2 DECKING
Wood decking in No. 2 or better Southern Yellow Pine with a minimum thickness of three inches
(3”) thick x twelve inches (12”) wide planks treated according to the American Wood Preservers
Bureau or Fiber Reinforced Polymer decking (FRP) as a substitute provided the FRP decking meets or exceeds the required pedestrian loading.
4.3 HARDWARE
Bolted connections shall be A307 hot-dipped galvanized steel unless otherwise specified. Mounting devices shall be galvanized or stainless steel.
5.0 SUBMITTALS
5.1 SUBMITTAL DRAWINGS
Detailed construction drawings and diagrams shall be submitted to DCNR for review after receipt of order. As required, all drawings shall be signed and sealed by a Pennsylvania licensed Professional Engineer registered in the Commonwealth of Pennsylvania.
5.2 SUBMITTAL CALCULATIONS
As required, structural calculations shall be submitted to the DCNR. All calculations will be signed and sealed by a Pennsylvania licensed Professional Engineer registered in the Commonwealth of Pennsylvania.
6.0 FABRICATION
6.1 TOLERANCES
All cutting and drilling fabrication to be done by experienced fiberglass workers using carbide or diamond-tipped tooling to a tolerance of 1/16”. No material deviations beyond industry standards are accepted. All cut edges to be cleaned and sealed.
7.0 RAILINGS
Railings for bridges will be a minimum of forty-two inches (42”) above the floor deck and designed to AASHTO standards for both pedestrian and snowmobile loadings.
7.1 SAFETY RAILS
Continuous horizontal midrails shall be located on the inside of the bridge trusses. Maximum opening between the midrails shall be available as required, but should not be greater than allowed by AASHTO.
7.2 TOEPLATES
Toeplates are three inch (3”) channels
8.0 FINISHING
Bridge color shall be as chosen by the Department. No painting is required or permitted as the color is added during the manufacturing process.
9.0 DELIVERY
Delivery is made by truck to:
R. B. Winter State Park 17215 Buffalo Road Mifflinburg, PA 17844-9656
The Contractor will notify DCNR in advance of the expected time of arrival at the site. Bridge will be shipped to the site in component parts or partially assembled. The spans can be completely assembled using standard hand tools.
9.1 ERECTION DIRECTION
For bridge shipped in component parts or partially assembled, Bidder shall provide assembly drawings and a recommended assembly procedure for constructing the bridge. Temporary supports or rigging equipment, if needed, will be the responsibility of the Department.
9.2 SITE ISSUES and FOUNDATION DESIGN
DCNR shall procure all necessary information about the site and soil conditions. The design of the bridge abutments shall be included in the design as submitted by the fabricator.
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