COLORADO STREET BRIDGE SUICIDE MITIGATION ENHANCEMENTS DONALD - - PowerPoint PPT Presentation

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COLORADO STREET BRIDGE SUICIDE MITIGATION ENHANCEMENTS DONALD - - PowerPoint PPT Presentation

Jan 20, 2023 153 likes •586 views

COLORADO STREET BRIDGE SUICIDE MITIGATION ENHANCEMENTS DONALD MACDONALD ARCHITECTS + GPA + BIGGS CARDOSA COMMUNITY OUTREACH MEETING #2 OCTOBER 29, 2019 COMPREHENSIVE PARNASSUS HEIGHTS PLAN MARCH 12, 2018 1 AGENDA Team Introductions

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COMPREHENSIVE PARNASSUS HEIGHTS PLAN

MARCH 12, 2018

COLORADO STREET BRIDGE SUICIDE MITIGATION ENHANCEMENTS

DONALD MACDONALD ARCHITECTS + GPA + BIGGS CARDOSA COMMUNITY OUTREACH MEETING #2 – OCTOBER 29, 2019
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AGENDA

donald macdonald architects

Team Introductions 30 min Project Overview Guiding Principals Vertical Barrier Effectiveness Strategies Vertical Barrier Design Alternatives Breakout Session: 30 min

  • Vertical Barrier Design Options

Community Comment / Q&A 30 min

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  • Golden Gate Bridge Suicide Deterrent, San Francisco, California
  • Ironworkers Bridge, Vancouver, British Columbia
  • Cooper River Bridge, Charleston, South Carolina
INTRODUCTIONS:

DONALD MACDONALD ARCHITECTS TEAM

Suicide Deterrent Projects:

Bridge Architects

Project Overview

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PROJECT OVERVIEW

  • Task Force Research / Mitigation

Alternative Intervention Proposals  Full Length Vertical Barrier

  • Historic Precedent
  • Architectural Vulnerabilities
  • Alcoves
  • Pilasters and Balustrade
  • Ends / Approaches
  • Operations, Maintenance and First

Responder Impacts

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CONSTRUCTION CHRONOLOGY

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Generative Design Guidelines – Design Criteria and Metrics

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Guiding Principals

Historic and Character Defining Features

  • Retaining the existing

balustrade.

  • Retaining the light pedestals,

light poles and fixtures.

  • Retaining the alcoves and

maintain at least some of them useable for pedestrians

  • n the bridge.

Bridge Aesthetics

  • Complimenting the Beaux Arts

architecture, proportions, massing solids and voids.

  • Use of materials that provide

transparency, complimentary color and texture, and longevity.

  • Design sensitivity to both views
  • f the bridge, and from the

bridge.

Effectiveness

  • Establish an effective barrier

height.

  • Removing hand holds,

footholds, toe holds and other means of climbing advantage.

  • Sealing off the bridge ends.

Other Concerns:

  • Facilitate first responder's ability to communicate and access jumpers breaching the barrier
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Barrier Effectiveness – Climbability

Design Criteria - Establish barrier height to eliminate ability to stand on highest toe

hold to reach top of barrier

Metric - Height above highest Foothold ≥ 10’ Height above highest toehold ≥ 9’

donald macdonald architects

How High Can Someone Reach? A 6’-6” person can jump 10’ and reach 9’

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Barrier Effectiveness – Climbability

Design Criteria - Eliminate hand holds and toe holds as a means of climbing Metrics -

Space horizontal elements that can be grasped ≥ 9’ apart

donald macdonald architects
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Barrier Effectiveness – Climbability

Design Criteria -Eliminate ability to climb lamp poles / shimmy between pole and barrier / and other “parkour” methods of climbing / breaching the barrier Metric – Keep ”stretch & grasp” distances to top of barrier ≥ 7’

donald macdonald architects
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Barrier Effectiveness –

Scoring system for climbability:

If top of barrier has overhang if lamp has climbing guard collar if material openings are too small for fingers to penetrate (1/2” or less) if top of barrier has horizontal elements within 7’
  • f top
if material openings are .5” to 1” if material openings are 1” or larger

+1 +1

  • .5

Scoring system for climbability: Barrier is 10’ or higher from highest foothold and 9’ from highest toehold. If the barrier is less than 10’ from the highest foothold but greater than 9’ from either the highest foothold or toehold.

3 2 +1

  • .5
  • 1
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Alcoves, Pilasters, Lamp Pole & Balustrade

Historic and Character Defining Features

Preserve Lamp Pedestal and Lamp Pole Prominence Preserve Balustrade Defining Features Preserve Alcove Openings at Some or All Occurrences

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11’-6”

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13’

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13’

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SLIDE 18 8’ 2’ BARRIER WRAPS AROUND BACK SIDE OF PILASTER BARRIER WRAPS AROUND BACK SIDE OF PILASTER LAMP REMAINS AT ORIGINAL HEIGHT

9’

Condition at Bridge Ends

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Condition at Bridge Ends

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Design Alternatives

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‘A’ Panels

w/ posts at corbels

4

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Rods

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Rods

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Pickets ‘A’ Panels

Pickets w/ posts at corbels

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‘B’ Panels

Mesh w/ posts at corbels
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Breakout Discussion

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Q & A

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Key Next Steps