Building Structures- Case Studies & Concepts
342910 - The Tallest Modular Tower Design Utilizing a Performance Based Approach
Friday, April 20
1:30 PM - 3:00 PM
The Tallest Modular Tower Design Utilizing a Performance Based Approach
1) Randall Miller, PE, Chief Executive Officer, RAD Urban
2) Hessam Kazemzadeh, PE CEng MIStructE, Director of Engineering, RAD Urban
3) David Tse, Project Engineer, RAD Urban
2044 Franklin St. Tower in Oakland, CA, when completed in 2018 will be the tallest structure in US utilizing Volumetric Modules as an alternative to conventional construction methods. A vertically integrated team of AEC professionals in collaboration with manufacturing experts designed a modular system suitable for a mixed-use tower of this size. The structural engineering team developed a unique structural system comprising steel plate shear wall core supplemented with BRB outriggers to provide a ductile response to severe West Coast earthquakes. This structural system not only integrated well with the architectural and real estate requirements, but also helped to maximize the work in the factory and to minimize the on-site labor work.
The use of Performance-Based Design in conjunction with full-scale testing of some of the critical structural components helped to establish a compatible lateral story drift ratio of up to 2.75% at MCE level for the modular gravity space frame. The primary energy dissipation mechanism is envisioned to be a combination of steel plate shear wall’s post-buckling tension field action and BRB yielding. The proposed structural system translated to substantial material savings up to 30% and improving the construction speed by 6 months compare to traditional structural systems and construction methods.