december 2015 - the southern gateway · corridor aesthetics plan: oak cliff laced strata aesthetic...

DRAFT

DECEMBER 2015

OVERVIEWi

CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project

TABLE OF CONTENTS

Overview

Oak Cliff (I-35E) Corridor Aesthetics

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ACKNOWLEDGEMENTS

Texas Department of Transportation

Project StakeholdersCity of Dallas

DARTDallas CountyDallas Zoo

Consultant Team HNTB Corporation

OVERVIEW

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Overview

Corridor Aesthetics Plan: Inventory and Analysis

Corridor Aesthetics Plan: Assessment

Corridor Aesthetics Plan: Theme Application

Corridor Aesthetics Plan: Oak Cliff Laced Strata Aesthetic

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OVERVIEWiii


Overview

The future of Oak Cliff and Southern Dallas County has never looked brighter. Contributing to this bright future is one of the Texas Department of Transportation’s most ambitious projects – The Southern Gateway (TSG) Managed Lanes Project.

The Southern Gateway includes some of the most beautiful terrain in the Dallas-Fort Worth Metroplex – with its rolling hills, mature trees, and native limestone outcroppings.

The project has identifi ed long-range transportation improvements that provide a continuos managed lane system throughout the 19-mile corridor along I-35E and US 67 servicing the southern Dallas communities.

High traffi c demand and environmental constraints provided a challenge for the design team in an area that boasts regional attractions like the Dallas Zoo, Historic Oak Cliff, and the landmark - Oak Cliff Tower.

The design team recommended improvements that were based on balancing the mobility needs, minimizing environmental impacts, and incorporating the unique characteristics of the communities into the aesthetic design. The Southern Gateway Managed Lanes Project contributes to the bright future of southern Dallas County by balancing transportation needs, environmental impacts, and aesthetic design resulting in a project that adds to the area’s natural beauty.

Corridor Aesthetic Plan

A Corridor Aesthetics Plan, which incorporated the corridor aesthetic components developed in 2003 as part of the Southern Gateway Context Sensitive Design (CSD) effort, was previously developed. The Corridor Aesthetics Plan included a limited public involvement process which was conducted in conjunction with an expanded inventory and analysis, and refi ned aesthetic corridor concepts that drew upon the previous study’s preferred aesthetic theme.

Overview

Corridor Technical Guidelines

The Southern Gateway Project - Corridor Technical Guidelines include urban design details for aesthetics and architectural treatments and enhancements. These Technical Guidelines outline general design direction on urban design elements in terms of form, shape, dimension, color palette, and architectural character to guide fi nal design. These guidelines create a benchmark for design of project elements that establish a responsible, cost-effective design direction.

The Corridor Technical Guidelines offer design guidance to create an overall corridor of design continuity while maintaining individual localized identity. The guidelines refl ect an emphasis on visual quality and design fl exibility. Adherence to these guidelines is intended to create a unique and well-designed Interstate and managed lane facility, and to provide responsible, cost-effective design direction to fi nal design professionals.

Designers are responsible for all federal, state and local compliance issues and site applicability. Final materials, details and location of elements shown as part of this document are subject to decisions made during preparation of fi nal plans and specifi cations.

OVERVIEWiv


The Corridor Aesthetics Plan Inventory and Analysis was developed to create a fundamental understanding of the relationships between the highway corridors’, connective transportation network, available access, intersection hierarchy, intersection confi guration (overpass vs. underpass), adjacent land uses, natural features, and major landmarks and destinations.

Corridor Aesthetics Plan: Inventory and Analysis

OVERVIEWv


The Corridor Aesthetics Plan Assessment provided an organizational framework for looking at the corridor as a whole while identifying logical corridor District segments that share logical groupings based on the common corridor conditions and natural and political environments.

The objective of the Assessment is to maintain structural consistency of aesthetics related to hardscape elements and structures throughout the length of the mainlane corridor of I-35E and US 67 while other opportunities within the ROW related to enhancements and local identity monumentation could take on the individual character of each District.

Additionally, major interchanges could offer the opportunity for Gateway level enhancement treatments.

Standard engineering elements that can be affected with aesthetic treatments and collectively total 1% or less of the project cost can be included in the project. These elements include: railing and concrete barriers, MSE walls, bridge bents, signage, noise walls and toll gantries.

Elements that consider hardscape, landscape, decorative pedestrian lighting, pedestrian fencing, local identity monumentation and gateway enhancement treatments would require community participation to fi nance, construct and maintain.

Corridor Aesthetics Plan: Assessment

OVERVIEWvi


The Corridor Aesthetics Plan Theme Application is a refi nement to the Assessment that combines the districts into three zones for application of each zones aesthetic character treatment of roadway, bridge and pedestrian elements.

In this, the Corridor Aesthetics Plan’s overall aesthetic character is maintained throughout the entire corridor, while simultaneously refl ecting individual aesthetic differences in each theme zone related to color, texture and “strata relief” patterns.

The previous study’s preferred aesthetic theme derived its character from the unique aspect of the changing geology characterized by the escarpment south of the Trinity river. The design took into consideration the area’s rolling hills, mature trees and exposed native limestone seen throughout the project. The limestone geology, or strata, established the corridor theme and was interpreted through pattern in the corridor elements as an aesthetic “skin” or texture of the common corridor elements.

Central to the uniqueness of the aesthetic texture is a three-dimensional interpretation of exposed “strata”. In the I-35E theme zone the “strata” is represented as the “Lower Strata” positioned on the lower portions of the corridor elements. In the US 67 theme zone the “strata” is represented as the “Upper Strata” positioned on the upper portions of the corridor elements. The Oak Cliff “laced strata” represents a coming together of each corridor in a combined pattern from both the Lower and the Upper Strata.

Corridor Aesthetics Plan: Theme Application

OVERVIEWvii


The Oak Cliff Laced Strata Aesthetic draws upon the notable canyon condition of the corridor and the predominant views of the Dallas Skyline to create the “Laced Strata Aesthetic”.

The aesthetic ‘strata relief’ texture mimics the areas natural features and dominates the elements surface. Shade and shadow create 3-Dimensional full pattern on retaining walls, noise walls and column bents.

Corridor Aesthetics Plan: Oak Cliff Laced Strata Aesthetic

Oak Cliff Laced Strata Aesthetic

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Corridor Aesthetic Theme Overview

Underpass Bridge Prototype

Overpass Bridge Prototype

Bridge Bent

Walls

Coping

Bridge Identifi cation

Rails

Direct Connector

Sign Structures

Soundwall

Enhancements

Color and Texture

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Oak Cliff Laced Strata Aesthetic9

CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project Corridor Aesthetic Theme Overview

The Oak Cliff Laced Strata Corridor Aesthetic applies to the portion of the I-35E project corridor north of the US 67 merge. The Oak Cliff Corridor Aesthtetic travels through the City of Dallas. The Oak Cliff Corridor consists primarily of an undepass canyon corridor condition. Portions of the project north of the Trinity River will need to coordinate appropriately into the Horseshoe Project aesthetics.


CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project Underpass Bridge PrototypeNotes:

• This bridge confi guration represents a highway crossing under a local road. The design aesthetic establishes the overall aesthetic design intent as applied to the majority of underpass bridge conditions in the I-35E Corridor.

• Aspects such as lane confi gurations, bridge height, spans, wall type, etc., will vary according to geometric, structural and site-specifi c conditions.

Bridge Side Elevation

Abutment Elevation / Plan

Bent Elevation / Plan


CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project Overpass Bridge PrototypeNotes:

• This bridge confi guration represents a highway crossing over a local road. The design aesthetic establishes the overall aesthetic design intent as applied to the majority of overpass bridge conditions in the I-35E Corridor.

• Aspects such as lane confi gurations, bridge height, spans, wall type, etc., will vary according to geometric, structural and site-specifi c conditions.

Bridge Side Elevation

Abutment Elevation / Plan

Bent Elevation / Plan


CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project Bridge Bent Notes:

• Use a pitched cap design to match roadway slope or super elevation. (Capitals to remain plumb to column)• Strata Relief to match 3 dimensional design intent as described in the wall panel design

Bent Elevation / Plan Front Elevation


CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project Wall Prototype

Elevation Section


CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project Wall Pattern Module

Pattern Module Prototypical Wall Section/Elevation


CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project Wall Panels

Pattern Module Prototypical Wall Modeled Rendering


CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project Wall Panels

Wall Panel - A

Side Section/Elevation

Wall Panel - C


Wall Panel - D


Wall Panel - B



CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project Coping

Coping Side Elevation / Elevation


CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project Bridge Identifi cationNotes:

• Bridge Identifi cation is provided as an aesthetic street signing addition to underpass bridges only for local cross street naming.


CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project Rails

Side Elevation / Elevation

Side Elevation / Elevation

Notes:• Traffi c barrier to match TxDOT standard for T221• Traffi c sloped rail to match TxDOT standard for SSTR • When traffi c barrier is attached to coping, the joint spacing in the barrier shall match alignment of the joint spacing of precast coping.

Vertical Face Rail (T221)

SSTR Rail


CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project RailsNotes:

• Traffi c sloped rail to match TxDOT standard for SSB and CSB barriers

CSB Barrier

Section

SSB Barrier

Section


CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project Direct Connector

Elevation / Plan Side Elevation

Notes:• Drainage and electrical conduits will be internal to the bent and column structure.• Strata Relief to match 3 dimensional design intent as described in the wall panel design


CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project Sign Structure

Sign Bridge Elevation

Cantilever Sign Elevation / Plan Side Elevation

Notes:• Strata Relief to match 3 dimensional design intent as described in the wall panel design


CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project Sound Walls

Notes:• Stepping of wall may occur at column.• Sound wall fi nishes alternatives to be precast concrete form liner application.

Sound Wall - Elevation / Section / Plan

Sound Wall Panel Pattern Segment- Elevation

Neighborhood Side Finish Options - Elevation

Ashlar Formliner

Brick Formliner

Grid Reveals Formliner


CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project Enhancements - Bridge ElementsNotes:

• Landscape, hardscape, decorative lighting, signing and monumentation enhancement opportunities exist with coordinated partnering of local enitites only and are above and beyond the baseline aesthetics.

• Coordinate with local entity for fi nal material selection(s). • Aspects such as lane confi gurations, median width, island and

sidewalk dimensions, ground plane treatments, bridge height, wall types, etc., will vary according to site-specifi c conditions.

Plan

Elevation - Wall Mounted Sign Option

Elevation - Monument Option


CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project Enhancements - UnderpassNotes:

• Landscape, pedestrian fencing, decorative lighting, signing and monumentation enhancement opportunities exist with coordinated partnering of local enitites only and are above and beyond the baseline aesthetics.

• Coordinate with local entity for fi nal material selection(s). • Aspects such as lane confi gurations, median width, island and sidewalk dimensions, ground plane treatments, bridge height, wall types, etc., will

vary according to site-specifi c conditions.

Plan

Pedestrian Fence and Wall Mounted Sign Elevation

Monument Sign Elevation



Enhancements - ElementsNotes:• Enhancement elements are opportunities for partnering with local enitites only and are above and beyond the baseline aesthetics.• Decorative pedestrian lighting to match local city standards.• Pedestrian fencing to meet TxDOT requirements.• Free standing architectural monument can be developed within the ROW for community identitiy opportunities that continue to

refl ect the character zone design aesthetic.• A metal pin mounted sign could also be applied to the wall.

Monument Wall Elevation Wall Mounted Sign Elevation

Decorative Pedestrian Fence Elevation / Section


CORRIDOR TECHNICAL GUIDELINESThe Southern Gateway Project Color and TextureNotes:

• Final color selection and method of application determined during fi nal design.

Primary Color (cool grey): Federal Standard 35630Rails, Coping, Texture 1

Texture 1 : Rugged Flagstone(formliner fi nish)

Texture 2: Alpine Stone(formliner fi nish)

Texture 3: Pheonix Limestone(formliner fi nish)

Base Color (warm grey): Federal Standard 36595Walls, End Columns, Texture 3

Secondary Color (metal grey): Federal Standard 36231Beams, Metal railing, Inner Column, Multi-column bent cap, Soundwall End Column

Strata Relief Color (warm tan/grey): Federal Standard 36424Wall Relief, Texture 2

december 2015 - the southern gateway · corridor aesthetics plan: oak cliff laced strata aesthetic...

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