HBM Experience – JACOBS

Project #1

Preliminary Investigation for the Adequacy of Supporting SprintEquipment at American Airlines Hangar#1O’Hare AirportChicago, IL 60666

The scope of services for this project includedthe preliminary investigation for the adequacy of the existing trusses, columns and pile foundations to support the new four prefabricated units and their supporting system at American Airlines Hangar #1 inO’Hare Airport.Included in the scope of work for this project werethe field inspection and evaluation, alternativestudies, and recommendations.The following three alternatives were investigated:

Alternative 1: Supporting four Sprint prefabricated units on the Roof of the existing

American Airlines Hangar #1

• Preliminary analysis of the new four prefabricated units supporting system to be installed on the roof
• Preliminary analysis of the existing trusses, columns, beams and pile foundations under existing and new loads

Alternative 2: Supporting the new Sprint equipment on the 3rdFloor

• Preliminary analysis of the existing trusses, columns, beams and pile foundations under existing and new loads

Alternative 3: Supporting the new Sprint equipment on the 2ndFloor

• Preliminary analysis of the existing trusses, columns, beams and pile foundations under existing and new loads

The structures(bridges and walls)are on a 13 mile stretch along the Regan Memorial Tollway Mile Post 126.9 (Washington Street) to Mile Post 139.1 (York Road). HBM preformed bridge inspections and preparation of the bridge condition report with rehabilitation design plans were completed.

As a result of the investigations, all three alternatives wereconsidered viable. The additional construction cost for the supporting platform and prefabricated units (materials, labor and handling) of Alternative 1wasjustified as it would result in no loss of storage space and transfer of loads from the platform directly to the columns and piles. Alternatives 2 and 3 werealso viable. Under Alternatives 2 and 3, the equipment wouldbe installed on a new structural support system spanning between the floor beams to carry the proposed load. The disadvantage of these alternatives wasthe loss of storage space

Analysis of the variations of each design alternative was performed. The resulting axial load-bending moment (P-M) interaction ratio for the columns, truss members and core area membersof both models wereall less than 1.00 under existing and proposed loads. The total governing applied load on the pile group was1247 kips which wasless than 1280 kips (the total foundation capacity). The applied load representedapproximately 97% of the total capacity.

Year Studied: 2007
Prime Consultant:
TRUSSNETUSA, INC
Subconsultant:
HBM Engineering Group, LLC

Project #2

Mechanical Equipment Supporting SystemsOn Existing and New Buildings

HBM Engineering Group, LLC has performed structural engineering services for the replacement of mechanical equipment at many locations, including high rise buildings. The scope of services for these projects typically includeinspection, analysis of existing structures, design of all structural elementsto support the mechanical equipment, production of structural drawings and specifications, review of shop drawings, and coordination.Below are a few highlighted projects:

Project #3

Olivet Nazorene University – Benner and Ludwig Buildings 1 University Avenue Bourbonnais, IL 60914

The scope of services for this project included inspection, analysis of existing structures, design of all structural elements to support the mechanical equipment, production of structural drawings and specifications, review of shop drawings, and coordination.

Year Designed: 2007/2008
Year Constructed: 2008

Prime Consultant:
Elara Engineering
Subconsultant:
HBM Engineering Group, LLC