international association for shell and spatial structures

Collective Members

Below is a listing of Collective Members' Business Cards. These IASS Collective Members have elected to post their business cards on this site to indicate that they support the goals and activities of the IASS through their annual membership, and that they extend the benefits of membership to their staff and organization (as described in the Membership page of this site). 

Here is also a link to a page for IASS members only (requires login) with the Directory of all active Collective Members that links the organization name to the name of the Collective Representative. Members may access this page by selecting Directory of Collective Members.

Collective Members' Business Cards

This portion of the site is under continuous construction with new business cards appearing in the order in which they have been submitted.  Current or new Collective Members wishing to add their "business card" to this directory may do so by providing the necessary information in the profile of the Collective Representative (Log in, choose MEMBER TOOLS, select "View profile" and then "Edit profile.") and thereafter notifying the IASS Secretariat of the request to add a new business card.

Centro de Estudios y Experimentación
 de Obras Públicas (CEDEX)

CEDEX is an Autonomous Public Agency, dependent upon the Ministry of Transport (Ministerio de Fomento) and Ministry of Environment of Spain, providing research, testing and high level technical assistancein the field of transport, public works and environment. The Laboratorio Central de Estructuras y Materiales of CEDEX currently hosts the Secretariat of the IASS.

Madrid, Spain

Skidmore, Owings & Merrill LLP

SOM is one of the leading architecture, interior design, engineering, and urban-planning firms in the world, with a reputation for design excellence and a portfolio that includes some of the most important architectural accomplishments of the 20th and 21st centuries. Since its inception, SOM has been a leader in the research and development of specialized technologies, new processes and innovative ideas, many of which have had a palpable and lasting impact on the design profession and the physical environment.

Chicago, Illinois, USA with offices in New York, San Francisco, Los Angeles, Washington DC, London, Hong Kong, Shanghai and Abu Dhabi


Bollinger+Grohmann are engineers driven by passion for high-quality architecture and innovative solutions. They develop tailored solutions together with architects and clients, construction companies and industry.

Frankfurt am Main, Germany with offices in Berlin, Munich, Stuttgart, Düsseldorf, Vienna, Budapest, Paris, Brussels, Oslo, Rome, Milan and Melbourne

Thornton Tomasetti

Thornton Tomasetti optimizes the design and performance of structures, materials and systems for projects of every size and level of complexity. We are an independent organization of engineers, scientists, architects and other professionals who are committed to being a sustainable, diverse and enduring organization and the global driver of change and innovation in our industry

New York and 50 Offices Worldwide

Summum Engineering

Summum Engineering is a structural design, engineering and optimization consultancy. Summum specializes in the parametric modelling, finite element modelling and structural analysis of lightweight structures, natural construction materials, complex geometries and sustainable buildings.

Rotterdam, The Netherlands

COWI UK Limited

Owned by Danish parent, COWI A/S, COWI UK Limited is an amalgamation of Flint & Neill and Donaldson Associates. The UK business focuses on bridge, tunnel and marine structures. It also has an international reputation for work with masts and towers, and has participated in the IASS Working Group on Masts & Towers since its inception.

London, Glasgow, Uttoxeter, Derby, York, Bristol, Hong Kong


Ramboll is a world leading engineering and architectural company. Within structures, Ramboll designs bridges, tunnels, high rise buildings, wind turbines, towers, transmission lines, etc. A key area is masts and towers where Ramboll has designed more than 150,000 structures worldwide. Ever since the inception of the IASS WG 4 for Masts and Towers, Ramboll has been part of the management of the Group.

Copenhagen plus more than 300 offices around the world


We are structural engineers and architects with an integrated approach to form, function, sustainability and planning quality. We offer a consultancy service for design, optimization and calculations and we and deliver feasibility studies and tenders for our clients.

Radolfzell, Germany

Trust Engineering Group

TRUST ENGINEERING GROUP (TEG) is an engineering company that is specializes in providing high quality structural engineering services to the telecommunications industry.

Bucharest, Romania

Werner Sobek AG

Werner Sobek stands throughout the world for engineering, design, and sustainability. We work on all types of buildings and materials. Special emphasis lies on lightweight structural design, transparent facade systems, and sustainable building concepts. Our work is defined by premium design on the basis of high-class engineering combined with sophisticated green technologies.

Stuttgart, Germany with offices in Berlin, Buenos Aires, Dubai, Frankfurt, Hamburg, Istanbul, Moscow, New York and Vienna


POLARKON is active in steel structures, especially requiring special design such as space frames, free-form and skylight structures as well as conventional heavy steel works. POLARKON company structure is suitable to design unique connection details and shells and undertake the projects as turnkey projects including, structural design, detailing, fabrication and erection.

Ankara, Turkey and the United Arab Emirates

JSC Research Center of Construction

JSC Research Center of Construction is a scientific and engineering leader in the field of construction in Russia. Through more than 90 years, the Center operates to secure efficiency, reliability and safety of construction and civil and industrial engineering works and the The Center carries out R&D (theoretical, appraisal survey, applied), provides innovations and implementation thereof, develops standard technical documents (design and construction specifications, GOSTs, project-specific technical specifications, etc.). The Center is the leading company in the Russian building science, architecture and engineering and implements key governmental initiatives and projects.


Walter P. Moore

Walter P Moore is an international company of engineers, architects and consultants who solve some of the world’s most complex challenges. By leveraging creativity and technology, the award-winning design solutions innovated by the firm are cost- and resource-focused, forward-thinking, and help strengthen communities worldwide. Walter P Moore has a diverse staff from over 40 countries offering a wide expertise in structural and façade engineering, infrastructure, diagnostics and technology consulting.

Houston, Texas, USA with offices in New York, Los Angeles, San Francisco, Denver, Washington DC, Dallas, Toronto, Panama City and Pune, India

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