Q21 Wins SEAO 2017 Excellence in Structural Engineering AwardOct 17 2017 · 0 comments · Award-Winning Project, Mixed-Use, NISHKIAN DEAN ·0
We are honored and thrilled that the Q21 mixed-use project in NW Portland was a recent recipient of the Structural Engineers Association of Oregon (SEAO) 2017 Excellence in Structural Engineering Award for a New Building Over $10M. Designed by YBA Architects and constructed by Andersen Construction Company, Nishkian Dean served as the Structural Engineer of Record on the project.
SEAO is a nonprofit organization that works to educate the design industry and the community at-large on structural engineering topics, and provides a valuable forum for structural engineers to interact throughout Oregon.
“We would like to thank SEAO and the awards committee for this honor and we appreciate the continuous efforts of the organization to educate our members and strengthen our industry. We also want to thank the entire Q21 project team and especially YBA Architects for selecting us as the Structural Engineer for such a fun and challenging project.”
Rob Aman, Associate, Nishkian Dean
Located adjacent to the Conway District at NW 21st & Quimby in Portland, the 7-story, 202,200-SF project provides 162 living units, a courtyard, offices, parking, and ground-floor retail. The mixed-use project consists of two 3-story wood-framed residential buildings separated by a courtyard, all of which is situated above a two-level post-tensioned concrete parking structure that is partially below-grade.
The two buildings are connected directly to a seven-story post-tensioned concrete structure that includes residential units at the upper levels, an office floor level, and retail spaces at the ground floor. The concrete structure’s lateral force-resisting system consists of reinforced concrete shear walls, and a seismic joint was detailed to separate the wood and concrete buildings where they adjoin.
A one-story retail space extends off the north side of the structure, and 8 two-story townhomes occupy the ground level along the building’s south side. The project is highlighted by three-story double-tapered steel columns at the main entrance that form an “XXI” shape to symbolize the project name and street number location. These specialty steel columns were constructed with two tapered dodecagon (12-sided) steel sections welded together at the column midpoint to form a double-tapered member. A tapered cantilevered post-tensioned concrete beam spans the top of the steel columns to support four stories of structure above.
One of the most unique and challenging aspects of the project included preserving and modifying the 35-foot tall existing concrete tilt-up wall panels from the existing warehouse building on the site. The team incorporated the panels into the architectural and structural design as a non-structural exterior wall element to preserve the heritage of one of the early buildings that Andy Andersen, the founder of Andersen Construction, constructed and to promote the conservation of materials. This effort was significant and meaningful for Andersen Construction now that the family-owned business is being led by its third generation.
The existing concrete wall panels were cut, reinforced with steel backing and fiber reinforcement, and temporarily braced during construction. A few of the panels were lowered and transported to off-site storage to allow for site access during construction. Nishkian Dean provided full engineering support for this entire process during the initial phase of construction.
“The project afforded many opportunities for creative solutions to meet an ambitious and innovative vision. It was an honor to be a part of the cutting-edge design team on one of the first two-story podium structures in the City of Portland. We are very proud to receive such a prestigious award and grateful to SEAO for establishing a platform to recognize excellence in structural design.”
Dave Beh, Project Engineer, Nishkian Dean
Robert Aman, PE, SE (firstname.lastname@example.org) is an Associate with Nishkian Dean a structural engineering consulting firm in Portland, Oregon.
Dave Beh, PE (email@example.com) is a Project Engineer with Nishkian Dean a structural engineering consulting firm in Portland, Oregon.
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