Patent precast concrete hyperbolic paraboloid roof shells
Date & Time

13 September 2022
18:00

Location

Trevithick Lecture Theatre T2.09, Trevithick Building, Cardiff University, The Parade, Cardiff, CF24 3AA
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Price
Free
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Patent precast concrete hyperbolic paraboloid roof shells

Lecture
Date & Time

13 September 2022
18:00

Location

Trevithick Lecture Theatre T2.09, Trevithick Building, Cardiff University, The Parade, Cardiff, CF24 3AA
View on Google Maps

Price
Free
Availability

Places available

Martin Ashmead will talk about historic long span precast concrete roof shells and their relevance to the 21st Century

The technical talk will cover long span precast concrete roof systems, which were patented in the UK in 1957 or later but ceased to be manufactured in 1984.

There are many buildings with roofs of this type in the UK and internationally, which are nearing the end of their design life, that will require refurbishment or demolition.

As there are only few people alive with comprehensive knowledge of this form of construction and little if any archived information even on the net, this presentation will prove invaluable to those appointed to advise about such roofs in the future, as well as a good source of historic information.

The primary focus of this presentation will be on the patented precast concrete hyperbolic paraboloid roof shells, which consisted of mainly 22m span 66mm thick units. In addition, an introduction will be made to patented Silberkuhl composite tied arch roof shells, comprised of 80m span steel-concrete units.

Each aspect of the system will be explained in such a manner so as to be understood by all attendees, irrespective of age or discipline, including non-technical people.

1) The reason for the chosen subject.

2) Brief history of the people and firms involved with these patented roofs.

3) The shape advantages of the roof units.

4) The design and detailing of the HPA roof units.

5) Placing of the concrete, and strength testing.

6) Delivery of the HPA precast concrete roof units to site.

7) Erection of the HPA precast concrete roof units.

8) Fixing of the HPA precast concrete roof units to the saddle supports.

9) Roof finishes.

10) Demolition.

The presentation is about 60 minutes plus questions.

Speaker

Martin Ashmead FIStructE

Martin was involved with shell roofs, many of the supporting structures and foundations from 1962 to 1984. He has been a stalwart of the Western Counties Region Group Committee for 51 years, being awarded the accolades of Life Regional Group Membership in 2001, the IStructE Centenary Service Award 2009 and the IStructE Lifetime Achievement Award 2021 as well as many lecture awards including the IStructE Sir Arnold Waters Medal in 2017.

He has a wide range of knowledge and experience based on 35 years in industry and private practice, then 15 years in Bristol City Council Building Control Department as Principal Structural Engineer and Public Protection Manager & Dangerous Structures Proper Officer. He retired in 2008, but is still enthusiastically involved with the local committee, teaching and contributing to the Institution of Structural Engineers Journal.

 

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