5M, 415 Natoma Street

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