Academy Museum Sphere Construction: Engineering the Geffen Theater for the Motion Picture Industry

The Academy Museum of Motion Pictures in Los Angeles represents one of the most ambitious concrete construction projects in recent history. At its heart sits the Geffen Theater, a 150-foot diameter structural concrete sphere weighing 25 million pounds, suspended 12 feet above ground on just four columns. Located on Wilshire Boulevard adjacent to the La Brea Tar Pits, the project pushes the boundaries of structural concrete. For context on landmark museum architecture, see our coverage of Snohetta El Paso Childrens Museum Design Strategies for museum architecture in cultural districts.

The project comprises two components: a complete rehabilitation of the historic Streamline Moderne May Company building (now the Saban Building) and the spherical Geffen Theater. The sphere houses a 1,000-seat theater with a rooftop terrace, connected by three bridges to the museum building which contains exhibition spaces, an education studio, a conservation studio, a 288-seat theater, retail space, and a restaurant. Designed by the Renzo Piano Building Workshop with Gensler as executive architect, the project has been years in the making. The dream of a museum for the motion picture industry dates to 1929, with serious efforts reviving in 2008 and again in 2012 when the historic May Company building became available.

Structural Design and Engineering Challenges

BuroHappold Engineering, the structural engineer of record, faced a set of challenges rarely encountered in conventional building construction. Principal Derrick Roorda, who led the structural group, identified seven critical engineering demands that defined the project approach.

The Four-Point Support System

Unlike typical buildings that distribute loads across dozens or hundreds of foundation points, the Geffen Theater touches the ground at only four locations. Each of these four plinths carries a portion of the sphere’s 25-million-pound mass through a pair of 7-foot-diameter seismic isolators. This minimal-contact design required extraordinary precision in foundation engineering. Under each double set of plinths, 43 augercast 24-inch diameter friction piles extend 90 feet deep. The installation method involved drilling and pumping concrete through the center of the auger as it was withdrawn without rotation, maximizing friction between the concrete and the surrounding tar-sand soil.

Seismic Isolation Technology

One of the most remarkable features of the Geffen Theater is its seismic isolation system. Victor Zayas, president of Earthquake Protection Systems Inc., explains that seismic isolators allow a structure to remain relatively still while the ground moves beneath it. The eight isolators installed on this project, each weighing 28,000 pounds and measuring approximately 7 feet in diameter, enable the sphere to move up to 30 inches horizontally during an earthquake. This pendulum-like motion protects the structure from violent shaking, ensuring the theater can remain functional after even the most severe seismic event.

The key engineering constraints were:

• Only four points of the structure contact the ground
• The structure must insulate against external noise
• Every structural element influences the whole system
• Up to 30 inches of horizontal seismic movement must be accommodated
• Three connecting bridges must allow for differential movement
• Precast concrete exterior for superior finish control
• Complete structural support during construction to prevent deformation

Construction Methodology and Shoring Strategy

Morley Construction, based in Santa Monica, served as the structural and architectural concrete contractor for both phases of the project. Bob Stephens, Morley’s Project Executive, explains a fundamental paradox: a sphere is structurally sound only when complete. “It’s like holding a ping pong ball,” he says. “If you squeeze it in your hand it’s crush resistant, but if you cut a round hole in the ball it crushes easily and loses its shape.” This meant complete temporary support was required throughout construction.

The PERI Shoring System

Morley collaborated with PERI Formwork Systems and their engineering team from Germany to develop a comprehensive shoring solution. The engineering team identified 133 load points requiring specialized shoring, with monitoring protocols to track and adjust loads as construction progressed. Four different PERI shoring systems were deployed, each suited to different load requirements:

Morley placed engineered six-inch thick concrete slabs on grade, with thickened areas up to two feet, to support the shoring towers which weighed up to 20,000 pounds each. Tower cranes moved the shoring into position. The shore towers remained in place throughout construction, only to be removed after the completion of the ring beam at the top of the sphere. Throughout the construction period, survey teams monitored structural points at regular intervals to detect any signs of movement.

Mass Concrete Placement

Catalina Pacific Concrete supplied all mass concrete for the project, with demanding specifications including 7,000 psi strength at 56 days and strict temperature controls. The concrete could not exceed 160 degrees Fahrenheit at the center, and the temperature difference between center and edge could not exceed 35 degrees Fahrenheit. The transfer girders alone required 1,330 cubic yards of mass concrete. These beams, measuring 12 to 14 feet wide, 10 feet tall, and 132 feet long, form part of the sphere’s belly and carry the entire weight of the theater down to the plinths.

To manage heat of hydration, Catalina Pacific added up to 1,100 pounds of ice per load during batching, delivering concrete at approximately 60 degrees Fahrenheit. The placement began at 11:30 PM on a Friday night when aggregate piles at the ready-mix plant were coolest and continued until 11:00 AM the next day. After placement, the beams were enclosed in insulation to maintain the temperature spread below 35 degrees Fahrenheit. The consulting engineering firm CTL Group later allowed the maximum hydration temperature to be raised to 170 degrees Fahrenheit based on further analysis.

The Sphere Construction Process

The construction of the sphere itself involved an innovative combination of precast concrete, shotcrete, and sophisticated steel framing. The approach reversed the typical construction sequence by using precast panels as permanent formwork rather than installing them after the structure was complete.

Precast Concrete Formwork

Willis Construction of San Juan Bautista, California, created a digital model of the sphere’s exterior and used a CNC router to cut positive foam shapes. From these, they cast forms using Glass Fiber Reinforced Concrete (GFRC). Each precast panel is four inches thick with 4×4-4×4 welded wire fabric reinforcement and 7,000 psi concrete. The panels serve as permanent architectural formwork for the structural shotcrete that follows. Every panel penetration for the glass canopy attachments was modeled digitally to ensure precise location on the sphere’s curved surface.

Shotcrete Application

The structural sphere walls are shotcrete, applied two feet thick against the back of the precast panels with a bond breaker ensuring separation. The shotcrete contains heavy steel reinforcement and is finished on the interior to mirror the spherical shape. Strength specification is 7,000 psi. Only a single nozzle-man, certified by the City of Los Angeles for this project, is permitted to spray concrete, followed by a support worker with a blow pipe to keep rebar clean.

Elaborate interior steel frame supports were built into the sphere to provide the perfect spherical shape for attaching precast panels. Greg Wade, Vice President of Matt Construction, notes that these frames also support the structure during construction, with protruding sections removed after shotcrete application. The integration of these systems demonstrates how modern construction techniques, aided by Ai Transforming Construction Industry practices like digital modeling and simulation, enables projects that would have been impossible just a generation ago.

The Ring Beam and Completion

A ring beam near the top encircles the sphere, tying the structure together and giving it final rigidity. Only after the ring beam is complete can all shoring towers be removed, allowing the plinths to support the sphere for the first time. A concrete deck above provides approximately 10,000 square feet of floor space for events, covered by a glass canopy supported by steel embeds through the precast walls.

Building Information Modeling and Project Coordination

Projects like the Academy Museum sphere would be extraordinarily difficult to build without BIM. It provided the digital backbone for coordination across all contractors and trades. Matt Construction managed BIM coordination and clash detection, while subcontractors developed their own BIM drawings layered onto the master model.

Ed So, Senior Virtual Construction Manager for Morley, works full-time managing BIM on this project. His responsibilities include generating layout points, material quantities, takeoffs, schedules, sequence diagrams, and coordination drawings for constructability. He uses BIM to help monitor point load towers for movement and has employed 3D printed plastic models to help workers visualize complex details. “Sometimes even a 3D drawing is too hard to visualize,” he observes. The BIM model, initially created by the architect in Revit, continues to evolve throughout construction and will ultimately serve as the basis for as-built drawings. Advanced modeling tools are increasingly essential for complex structures, and Quantum Computing in the Construction Industry promises to further revolutionize how we simulate and optimize these kinds of structural challenges.

Foundation Challenges on Tar-Sand Soil

Building a 25-million-pound structure on the La Brea Tar Pits site presented unique geotechnical challenges. The excavated soil was tar sand, requiring special monitoring equipment called “sniffers” to warn workers of noxious gases. A methane barrier was installed beneath all underground rooms, tunnels, and plinths, sandwiched between concrete slabs so gas can move around the membrane and exit away from the buildings.

Project Team and Collaboration

The core project team included:

• Owner: Museum of Motion Pictures, Los Angeles
• Architect: Renzo Piano Building Workshop with Gensler
• Structural Engineer: BuroHappold Engineering
• Project Manager: Paratus Group
• General Contractor (Phase 1): Morley+Taslimi
• General Contractor (Phase 2): Matt Construction
• Concrete Contractor: Morley Construction
• Ready-Mix Concrete: Catalina Pacific Concrete
• Forms and Shoring: PERI Formwork Systems
• Precast Concrete: Willis Construction
• Shotcrete: Superior Gunite

The barrier between decorative and architectural concrete grows increasingly blurred on projects like this one. The sphere showcases natural concrete color and high-quality forming that draws people in through curiosity about what lies inside. For museums and cultural buildings, the choice of envelope system is critical. Our article on Curtain Wall Design for Museum Buildings Glazing Strategies explores how other landmark cultural projects have approached the intersection of structural performance and architectural expression.

Bob Stephens captured the personal significance of the work best. He noted that jobs like this make it exciting to go to work in the morning, knowing one is doing something truly special. He thrives on the teamwork and technical demands and looks forward to the day he can show the theater to his grandchildren, telling them “We did this. We were here.” The Geffen Theater at the Academy Museum of Motion Pictures stands as a testament to what the construction industry can achieve when engineering excellence, material science, and collaborative teamwork converge.