Summit on Sixth

Los Angeles, CA | 11 stories | 181,000 sq ft

As  part of the Los Angeles City Adaptive Reuse Program, the Summit on Sixth is the seismic retrofit of an 11-story, 181,000-square-foot steel moment frame office building that has been converted into a condominium.

By working with the developer and understanding their needs, we were able to show that the existing steel moment frames can resist the code based seismic forces and satisfy the code drift requirements without further strengthening. In order to obtain a Request for Modification from the City, a non-linear push-over analysis was conducted. This resulted in substantial savings and eliminated the need for additional lateral elements. The existing steel framing has unique features of semi-rigid bolted moment frame connections.

In areas where additional load was imposed on the gravity system, we determined that plating the existing members would be more cost effective than replacing the existing members with the new steel. We also worked in collaboration with the owner and contractor to retrofit and detail the supports of the new exterior skin for this condominium project in the most cost effective way.