FDOT Standard Plans Index 534-200: Precast Noise Walls

Design Criteria

Design Criteria AASHTO LRFD Bridge Design Specifications ; Structures Design Guidelines ( SDG ) ; Structures Detailing Manual ( SDM ) ; Soils and Foundations Handbook

Design Assumptions and Limitations

Design Assumptions and Limitations See SDG 3.16 for structural design criteria. This Standard Plan is designed for noise walls outside the clear zone. If noise walls cannot be placed outside the clear zone or a at a minimum of 4 feet behind the top front face of a traffic railing or concrete barrier per AASHTO LRFD BDS Section 15, use Indexes 521-509, 521-510 and/or 521-511 (Traffic Railing/Noise Walls).

General Design Assumptions: • Wall height is the nominal height of the wall above finished grade. Wall heights range from 12' to 22' in 1'-0" increments with posts spaced at 10' and 20' nominal centers. • Wall Panel segments are limited to a 12'-0" maximum height and 20' maximum length.

• Wall Panels are the same for all Florida wind zones and total panel height is wall height plus 1 foot. • Posts are designed to resist wind pressures based on requirements of SDG 2.4 and SDG 3.16. Velocity Pressure Exposure Coefficient (Kz) is 1.0 for all standard wall heights and the assumed Drag Coefficient for is 1.2.

Top of wall elevations are less than 33 feet above the surrounding terrain. • Foundation depths are calculated using Broms method for overturning. Soil boring characteristics averaged over a depth of 8 shaft diameters may be assumed per NCHRP Report 343 (pg.

198). • Foundations in this Index have been designed in accordance with the Soils and Foundations Handbook , Appendix B, assuming the following soil conditions: Medium Dense Granular Soil (Type 2) Standard Penetration Test (SPT) N Values between 10 and 40 o Effective Soil Unit Weight = 50 pcf o Internal Friction Angle = 30° o Cohesion = 0 psf o Generally use the average N value over the foundation depth Loose Granular Soil (Type 1) SPT N values between 4 and 9 Index 534-200 Precast Noise Walls o Effective Soil Unit Weight = 40 pcf o Internal Friction Angle = 28° o Cohesion = 0 psf • If the site specific soil conditions are weaker than these values or if a site specific design is desired, design foundations in accordance with SDG 3.16 and consult with the District Geotechnical Engineer. Alternate Technical Proposals: Alternate precast concrete noise wall designs may be considered for approval by the State Structures Design Engineer with concurrence from the District Structures Design Engineer.

Design calculations meeting the wind load requirements for the project site in accordance with the SDG must be submitted for review and approval by the EOR. Technical Specifications with material and testing requirements should be submitted by the Contractor for approval prior to acceptance of any alternative technical proposal (Contractor Saving Initiative for Design-Bid-Build projects, or Alternative Technical Concept for Design Build/P3 projects). Higher strength reinforcing meeting the requirements of ASTM A615 or ASTM A1035 may be considered for resizing the flexural reinforcement while maintaining the same concrete cover, dimensions and similar bar spacings for posts, piles and panels.

General Design Limitations: Ensure the system is constructible along the entire length of the wall with consideration of overhead clearances (e.g. overhead services, tree canopies, existing overhead structures, etc.) and underground services along the entire length of the wall. During the design process, locate potential conflicts or abrupt base elevation changes and include any special designs in the plans.

• If vertical wall clearance is limited, consider the low clearance post/foundation option and shorter panel heights (minimum of 4'). Minimum vertical clearance for use of top-installed panels is controlled by the height of the post plus the tallest panel height and the panel lifting mechanism. Side-installed panel details are included in the Standard; however, use is limited to locations where the vertical clearance between posts prohibits top-installation.

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Payment

Payment Item number Item Description Unit Measure 534-72-101 Concrete Noise Wall, Permanent SF 534-72-102 Concrete Noise Wall, Temporary SF Example Wall No. 1 aesthetics require a recessed panel type wall with Type C post caps. The front and back face panel textures are to be Ashlar Stone.

The post texture is to be smooth. The wall will not have any graphics. The color of the wall, posts and caps is to be a light brown, (color number 33446).

Wall No. 2 aesthetics require a flush panel type wall. The front face of panels and posts are to be Trapezoid Vertical Fins with Fractured Face (Colorado Drag), with graphics.

The Back Face Panel texture is to be Pea Gravel. The color of the wall is to be light brown, color number 33446. Post caps are not required.

TABLE OF VARIABLES, CADD CELL 534-200 "NOISE WALLS DATA TABLES" PROJECT REQUIREMENTS Fable Date 1-07-74 WALL NO. (I) REQUIRED: (YES/NO) REQUIRED TEXTURES: PANEL TYPE (FLUSH/ RECESSED/ EITHER) GRAPHICS (1) COLORED COATINGS (2) PRECAST POST CAP (3) PANELS: POSTS: FRONT FACE BACK FACE FRONT FACE BACK FACE 1 NO YES C B B A A RECESSED 2 SB -I YES NO H F H A FLUSH (I) See Control Drawings. (2) Coat all exposed faces of panels with Class 5 Applied Finish Coating.

The color shall be per Federal Color Chart, Federal Standard No. 595C color 33446. (3) Coat post caps the same color as posts, with a Class 5 Applied Finish Coating.

The color shall be per Federal Color Chart, Federal Standard No. 595C color 33446. Index 534-200 Precast Noise Walls

What your plans must show

Plan Content Requirements for this index — the SPI's checklist for designers.

• • Noise Wall Alignment / Location
• • Begin/End Noise Wall Stationings and Offsets
• • Offset definition, usually from baseline to front face of Noise Wall
• • Drainage Hole Type and Stations
• • Adjacent overhead or in-ground services
• • Limits of sod or seeding/topsoil application
• • Where removal of or improvements to organic soils are necessary, show the limits of organic soils and the limits of required improvements in the plans along with removal/improvement methods and method of payment. Elevation
• • Top of Noise Wall elevations
• • Bottom of Noise Wall elevations and post length
• • Drainage Holes (Including type)
• • Adjacent overhead or in-ground services
• • Locations and names of Noise Wall Graphics
• • Limits of anti-graffiti coating (if required) Complete the following Data Tables and include them in the plans. See FDM 115 for