Lincoln Square Expansion
Downtown Bellevue continues to blossom into a vibrant, world class community. Currently under construction, Lincoln Square Expansion (LSE) includes two 450' towers, a five level podium, and six levels of subterranean parking, totaling 2.6 million square feet. A skybridge will connect the complex to Bellevue Square.
LSE includes several innovative design features, some of the most significant of which are: high-strength steel fibers in concrete coupling beams; long span 30’ x 50’ concrete framing throughout the subterranean parking, allowing the 50' spans to extend throughout 31 stories of the structural steel office tower; and high-strength, ASTM A913 Grade 65 structural steel, which was used to reduce steel tonnage in the office tower columns.
Performance-based design provided a means for design of steel fibrous reinforced concrete (SFRC) coupling beams. The SFRC eliminated all coupling beam diagonal bars – the bars that create extreme buildability challenges in conventionally reinforced coupling beams – and signicantly reduced the quantities of remaining rebar.
The North Tower’s 13,690-cu.-yd. mat foundation concrete pour was the largest ever in Washington State. View Infographic →