West
5670 Wilshire Boulevard
The twenty-seven-story office building at 5670 Wilshire Boulevard was constructed in 1965. SGH assessed the condition of the building's facades and designed repairs for various building elements.
San Francisco, CA
5M, 415 Natoma Street
Scope/Solutions
5M at 415 Natoma Street is a twenty-five-story, mixed-used high rise in San Francisco’s SOMA neighborhood. With condominiums, apartments, community green space, and Class-A office space, the development provides much needed additional residential capacity in the city. The building features large cantilevers in the lower floors that support multiple terraces and provide an inviting aesthetic for the public spaces, retail, and restaurants at street level. SGH provided construction engineering services to the steel fabricator/erector.
We helped the construction team implement their preferred sequence for the 6,000-ton steel structure. Highlights of our work include:
- Evaluating the partially constructed building behavior under lateral loading
- Designing shoring and bracing, including a temporary lateral-load-resisting system that stabilizes the structure during erection and providing bracing options to the structural steel erector to facilitate erection of more than eight levels of steel above the highest completed floor system
- Analyzing the building stability during construction to facilitate the placement of the concrete slabs on metal deck for the elevated floors that were constructed several levels above the lowest level of erected steel
- Designing a temporary lateral-load-resisting system to stabilize the structure during placement of the concrete slabs, including evaluating multiple levels of floor framing and detailing modifications for the steel beam connections to transfer lateral forces
- Designing temporary support for large, cantilevered balconies and terraces
- Providing erection requirements to maintain lateral stability of deep, long-span transfer plate girders during erection of the columns that are supported by the girders
- Designing weld platforms, including temporary connection details
- Designing temporary bracing for tower crane tie-ins constructed between floors to facilitate crane jumping
- Evaluating column lifting lugs and base for temporary construction loading
- Assisting with the erection aid design
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Project Summary
2021
Completion Date
650K
Project Size
Solutions
New Construction
Services
Structures
Markets
Residential | Mixed-Use
Client(s)
Schuff Steel | Swinerton Builders
Specialized Capabilities
Temporary Construction
Key team members
Additional Projects
West
Seattle Heights
Shorty after construction, occupants experienced water leakage, excessive air infiltration, and apparent mold growth. SGH investigated causes and consequences of the building’s problems and designed repairs.