Ciria is aiming for the construction industry to capitalise on expertise developed through Crossrail, Bank Station Upgrade and Tideway with plans to develop new guidance focused on ground movement.
The construction standards organisation is seeking industry support for a new guidance that would look at prediction, assessment and control of damage from ground movements.
According to Ciria associate director Kieran Tully, the industry could be at a disadvantage if it does not capture experience gained on recent and current major projects when the next big project comes along. “We also need to share this expertise nationally,” he said.
The new guidance will identify the principal sources of ground movements and the methods for their prediction using empirical and analytical methods. It will provide information on commonly adopted measures to control ground movements from initial design through to construction including temporary works. It also aims to provide guidance on permissible movement for different structure types dependent on their condition and structural characteristics and how this might be achieved by monitoring.
Tully said: “For many years building damage has been judged on the basis of Burland’s criteria which are related to potential damage - such as crack widths, the consequences of it - for example doors jamming - and the ease of repair. The defined damage categories relate to masonry structures.
“New structures such as framed buildings founded on deep foundations with cladding respond differently to masonry structures and a serviceability failure is defined differently. Given the nature of modern structures the whole issue of building damage criteria needs reviewing and good practice guidance provided as to the criteria that need to be set. Without a significant and detailed fundamental research programme from which criteria could be developed, work is needed to develop future guidance and to set out a framework for addressing damage to newer forms of structures.”
Ciria’s proposed guidance is aimed at addressing the immediate, short term construction issues as well as the long-term maintenance aspects with guidelines on permissible movement for different structure types and building systems dependent on their condition and structural characteristics. The document will also consider how current monitoring systems can provide information to maintain effective movement control and use case studies to define good practice procedures.
Tully said that Ciria hopes that through industry support it will be able to start work on the project in September this year with the guidance delivered by summer 2019.