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WJE PROJECTS

55 West Monroe

CLIENT	Manulife Investment Management
LOCATION	Chicago, IL

Facade Access Anchorages

In light of the updated OSHA regulations, WJE load tested the original davits and davit bases at the building to support facade access activities. During testing, several of the davit bases failed to support the OSHA-required loads for use with davits. Corrosion of the steel components of the davit bases appeared to be a contributing factor to their failure. Since replacing the davit bases would have triggered costly OSHA upgrades, the owner elected to replace the existing davit system with a less complicated anchorage system.

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BACKGROUND

The 55 West Monroe building, constructed circa 1977, is a forty-one-story, 473-foot-tall reinforced concrete structure, clad with an aluminum and glass curtain wall. The building is rectangular in plan with a rounded facade at the northeast corner. The roof construction consists of an eight-inch-thick, two-way, reinforced concrete flat slab that is supported by concrete columns.

In 2016, Occupational Safety and Health Administration (OSHA) issued a final rule updating the fall protection requirements of the General Industry Walking-Working Surfaces standard. The new regulations prohibit the use of rope descent systems (RDS) on buildings that are greater than 300 feet tall.

SOLUTION

WJE designed new dedicated anchorages for use with industrial rope access (IRA) for routine maintenance and for ground-rigged, contractor-provided swing stages for construction-related work. To provide OSHA-compliant facade access at the 55 West Monroe building, WJE performed the following services:

Documented existing conditions to determine an effective layout for new anchorages
Designed and prepared construction documents for new anchorages.
Coordinated roofing repairs with the previous roof installer to maintain the roofing warranty
Performed construction-period services during installation
Developed a testing protocol and load tested the new anchorages
Prepared a report summarizing methods of facade access, results of load testing, and requirements for equipment use and periodic inspections

Each anchorage was loaded in a manner that replicated the minimum strength (i.e. 5,000 pounds) required by OSHA and the Chicago Building Code in potential directions of use. All anchorages supported the test load without any significant permanent deformation or failure. Based on our test results, WJE concluded that each certified anchorage is suitable for securing a single fall arrest lifeline or equipment tieback wire rope for facade access using IRA or contractor-provided suspension equipment.

Wiss, Janney, Elstner Associates is committed to helping our clients solve, repair, and avoid problems in the built world. Supported by unparalleled laboratory and field testing capabilities, our team of engineers, architects, and materials scientists brings an enthusiasm for problem solving and a hands-on technical approach to every challenge.

Ask the Structure and Solutions for the Built World are trademarks of Wiss, Janney, Elstner Associates, Inc.

© COPYRIGHT WISS, JANNEY, ELSTNER ASSOCIATES, INC., NORTHBROOK, ILLINOIS. ALL RIGHTS RESERVED.

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FACADEORDINANCE.COM

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AMERICAS

EUROPE

WJE PROJECTS

55 West Monroe

CLIENT

Manulife Investment Management

LOCATION

Chicago, IL

Facade Access Anchorages

BACKGROUND

SOLUTION

SERVICES

MARKETS

DOWNLOAD

Engineering

Architecture

Laboratory

Field

Forensics

Design

FACADEORDINANCE.COM

SEISMICORDINANCES.COM

AMERICAS

EUROPE

55 West Monroe

CLIENT

Manulife Investment Management

LOCATION

Chicago, IL

Facade Access Anchorages

BACKGROUND

SOLUTION

SERVICES

MARKETS

DOWNLOAD

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