Los Angeles Football Club Soccer Stadium Aluminum Grandstands, Los Angeles, CA, USA
The removable grandstands are surrounded on three sides by precast seating risers in the north endzone of the Los Angeles Football club soccer stadium. The grandstands are a free-standing system. The system is comprised of aluminum trusses which are demountable from aluminum towers.
|Owners||Larry Berg, Brandon Beck, Bennett Rosenthal, Peter Guber, Tom Penn, Henry Nguyen, Ruben Gnanalingam, Vincent Tan, Will Ferrell, Mia Hamm Garciaparra, Nomar Garciaparra, Earvin Johnson, Goodwin Gaw, Chad Hurley, Tucker Kain, Kirk Lacob, Mitch Lasky, Mark Leschly, Mike Mahan, Marc Merrill, Irwin Raij, Tony Robbins, Lon Rosen, Paul Schaeffer, Brandon Schneider, Allen Shapiro, Mark Shapiro, Jason Sugarman, Joe Tsai, Harry Tsao, Rick Welts|
|Structural Analysis & Design||
Trex Commercial Products, USA
|Assembly||Harriot Contracting LLC, USA|
Dimensions of One Grandstand
The clear span between the single towers amounts to approximately 16 ft. The majority of the members are aluminum square and rectangular tubes. The towers are attached to the concrete substrate via internally threaded inserts epoxied into the concrete resulting in a flush surface when the system is removed.
The design in this area required Trex Commercial Products to provide folding seats and a guardrail to allow for safer spectator standing areas. The folding seats integrate into guardrail units and these are attached to the front of the aluminum risers.
The primary design challenges were based on the materials used and the use of the structure. The structure was welded aluminum such that reduced properties had to be considered in weld zones which was possible using the ALUMINUM ADM add-on module for RSTAB. DYNAM Pro was utilized to analyze the natural vibration modes and the performance of the structure subjected to significantly demanding rhythmic activities by spectators.
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The Aluminum Design Manual (ADM) 2020 was released in February 2020. The ADM 2020 gives guidance for both the allowable strength design (ASD) and load and resistance factor design (LRFD) for aluminum members to ensure reliability and safety for all aluminum structures.
Depending on stiffness, mass, and damping, structures react differently to wind action.
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Programs Used for Structural Analysis
The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions
Design of aluminum members according to the American standards ADM 2010 and ADM 2015
Dynamic analysis of natural frequencies and mode shapes of member models