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The National Capital Chapter of ACI was established in 1971 to enhance the Washington DC area concrete industry and promotes the overall interests of the American Concrete Institute, an international organization based in Farmington Hills, Michigan. Our Chapter takes pride in engaging the concrete industry at large and has many events throughout the year to network with others in the industry. We support future young professionals with Student Chapters at the University of MarylandHoward University and University of the District of Columbia. We provide:

Monthly Membership Meetings    -    Certifications   -    Seminars

Annual Awards Ceremony and Dinner    -    Annual Golf Outing    -   Annual "Night at the Nats"

To Join our Chapter Click Here

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Upcoming Events

National Capital Chapter ACI Annual Golf Tournament


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The Structural Genome of the MSG Sphere at the Venetian

Which is now UP AND RUNNING! 


Views: The 'MSG Sphere' In Las Vegas Will Reshape The Entertainment Industry | Boomers Daily

October 12, 2023


5:30 pm Social Hour
6:00 pm Dinner
7:00 pm Presentation

$60- Members 

$70 Non-members

register: https://nccaci.org/event-5387995

VENUE: Maggiano's

2001 International Dr., McLean, VA 

Presented by: 

Mr. Stephen Reichwein, PE, SE, SECB

 Presentation Description:

The MSG Sphere at the Venetian is located to the site just east of the current Sands Expo and Convention Center, in the city of Las Vegas, Nevada.  With approximately 606,000 square feet of area structured in a 515 feet diameter semi-spherical enclosure, which rises 325 feet in height, this immersive experience performance venue has the capacity to entertain a seated audience of up to 18,500. 

The overall structure of the venue has seven distinct parts; a foundation system composed of drilled shaft piles socketed into cast-in-place concrete caps interconnected by a grid of grade/tie beams (where necessary), the ground level slab on ground, the stadia bowl and main venue superstructure, four (4) cast-in-place concrete shear wall cores and a proscenium shear wall founded on mat foundations supported on piles, a one-story cast-in-place concrete “collar” structure (coiling around the southern quadrant of the Geosphere), the dome roof arch system (which will hang the immersive LED display plane), a hung grillage system (supported off of the roof and used to support the media plane, catwalk system, and A/V equipment), a two-story “Bridge/Service Building” in Area G, and the Geosphere exoskeleton. 

This presentation will focus primarily on the cast-in-place concrete structural systems of The MSG Sphere at the Venetian, describing the journey that was taken to get from paper to reality.  The presentation will not only focus on describing the various structural components of the project, parametric modeling and algorithmic design, but also the relationships with the various stakeholders and the people involved.

About The Presenter:                                                                      

Presenter Bio:              

Senior Associate – Severud Associates – New York City

Upon obtaining an integrated MAE/BAE degree in Architectural Engineering from the Pennsylvania State University, Mr. Reichwein joined Severud Associates as a structural engineer in 2009. His assignments have included project management, inter-trade coordination, structural analysis and modeling, structural design, structural detailing, preparation of structural contract documents, construction administration, concrete special inspections, on-site presence/assistance, and forensic structural engineering.

OUR chapter has been named an

ACI Outstanding Chapter for 2022

This program was initiated to recognize chapters that have attained a high level of achievement in chapter activities. OUR chapter can take exceptional pride in having reached this level since only 19 ACI chapters are receiving this award for 2022. 

The award will be announced during ACI’s 2023 spring convention at the Opening Session on Sunday, April 2, 2023, from 5:45 p.m. - 7:00 p.m.

Outstanding Chapters



National Capital

San Antonio

Republic of Colombia


Greater Michigan

Northeast Texas

Southern California

Minnesota Concrete Council


Eastern Pennsylvania & Delaware



Northeast Mexico

San Diego Intl

Southeast Mexico