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BRIDGE INVESTIGATIONS
Email Peter@PeterLindsell.com Tel. 02380 293833
Peter Lindsell & Associates have been working on the design, construction and assessment of bridges since 1968. In addition, members of the Company have taught on undergraduate and post-graduate courses on bridge design and management for over 25 years. Model testing and full-scale testing of bridges were undertaken during post-graduate research conducted at three Universities. The development of in situ stress measurement techniques and the demands for load testing of existing structures have led to detailed investigations of several hundred bridges.
Selected Publications
1. Lindsell P. “Segmental Construction and Assessment of Structural Behaviour”. Peter Lindsell & Associates Seminar on Developments in Prestressed Concrete Structures, New College, Oxford, September 1998.
2.Buchner SH. “Large Span Structures – Maintaining the Prestress”. Peter Lindsell & Associates Seminar on Developments in Prestressed Concrete Structures, New College, Oxford, September 1998.
3. Buchner SH. “Appraisal of Buried Structures”. Peter Lindsell & Associates Seminar on The Role of Load Testing in the Assessment and Repair of Bridges, New College, Oxford, April 1997.
4. Lindsell P. “A Survey of 80 Bridges”. Peter Lindsell & Associates Seminar on The Role of Load Testing in the Assessment and Repair of Bridges, New College, Oxford, April 1997.
5. Lindsell P. “Special Inspections – Quantifying the Risks”. Peter Lindsell & Associates Seminar on Post-tensioned Concrete Bridges – Assessing the Risks, New College, Oxford, January 1995.
6. Lindsell P and Buchner SH. “Structural Behaviour of Bridge Abutments”. Conference on Bridge Assessment, Management and Design. Proc. of Centenary Bridge Conference, Cardiff, Elsevier, September 1994, pp 411-416.
Special Inspection, Load Testing, Stress Measurements and monitoring of post-tensioned concrete viaduct.
Special Inspections
Peter Lindsell & Associates have been responsible for special inspections and structural investigations of more than 100 bridge decks. Detailed visual examinations, material tests, in situ stress measurements and live load tests have been undertaken on all types of bridge deck, ranging from cast iron to modern precast segmental concrete. A complete advisory and investigation service is available, as members of the Company have adapted specialist research skills to provide the necessary range of investigation techniques. Consequently, projects are undertaken on a national and international basis.
Selected Projects
2006 Detailed inspection of skew, 3-span reinforced concrete continuous arch river bridge, prior to controlled dismantling, Shropshire.
2004 Detailed inspection and testing of historic reinforced concrete promenade, East Sussex.
2004 Structural behaviour of deformed renforced concrete 3-span river bridge, Norfolk.
2001 Detailed inspection of historic steel swing bridge, East Sussex.
2000 Post-tensioned segmental railway footbridge, Derby.
1998-99 Detailed inspections and investigations of 12 No. rigid frame voided slab decks, Greece.
1997-98 Detailed visual inspection and internal examination of 22 span post-tensioned structure, Pakistan.
1995-97 Technical reviews and detailed advice on the Special Inspection of 15 No. post-tensioned bridges, comprising various contiguous, segmental, continuous and simply supported decks, Northern Ireland.
1995 Investigation of 10-span viaduct constructed from contiguous hollow box beams, transversely post-tensioned by unbonded Macalloy bars, London.
1994-95 Inspection, internal investigations, stress measurements and live load tests of 8-span twin viaduct with longitudinal and transverse prestress, Cumbria.
Special Inspection of multi-span post-tensioned concrete viaduct.
Post-tensioned Concrete
Peter Lindsell & Associates have wide experience in the design, construction, load testing, maintenance and demolition of post-tensioned concrete bridges spanning more than 30 years. The design of post-tensioned concrete structures and bridges have been taught at undergraduate and post-graduate level since 1975. On the basis of this range of experience, members of the Company drafted the Department of Transport Advice Note BA50/93, followed by research reports on the feasibility of strengthening and designing for demolition of post-tensioned bridge decks.
Selected Projects
2005 Inspection of condition of 3-span post-tensioned bridge, prior to refurbishment, Yorkshire.
2003 Inspection of skew 3-span continuous post-tensioned footbridge to determine safety procedures for demolition, Herefordshire.
2000 Inspection, load testing and stress measurements on cracked river bridge, London.
1999 Load testing and structural appraisal of 8-span twin viaduct, Cumbria.
1998 Load testing and structural appraisal of 22-span viaduct, Pakistan.
1997 Structural investigation and incremental load testing of 8 No. segmental bridge decks, Northern Ireland.
1996 Internal investigation, load testing and monitoring of 3-span continuous bridge, Hertfordshire.
1995 Investigation and assessment of 3-span cantilever/suspended span with abutment tie-downs, Hampshire.
1994 Structural appraisal and stress measurements in voided slab deck, London.
Investigation and Load Testing of 45m span post-tensioned concrete bridge beams.
Railway Structures
Peter Lindsell & Associates have worked on numerous railway bridges and associated structures. Structural assessment, live load testing, stress measurements and demolition operations have been undertaken on historic and modern bridges. Due to time constraints, many of these operations have been performed simultaneously, so that all necessary data and information could be gathered quickly and remotely before train services resumed.
Selected Projects
2000- 2007 Structural response of post-tensioned concrete viaduct to AIL loads and seasonal thermal movements over 8 year period, Cumbria.
2002 - 2006 Advice on demolition and monitoring procedures for series of 5 bridges across the entrance to Paddington Station. Bridges include steel bow string truss, two multi-span riveted plate girders, multi-span masonry viaduct and 2-span cast iron bridge.
2005 Structural appraisal of post-tensioned concrete decks an r.c. abutments, in order to create controlled collapse and rapid removal of debris from 4 railway tracks, Yorkshire.
2002 Structural appraisal of cracked multispan masonry arch and peer review of strengthening works, Berkshire.
2001 Instrumentation of riveted steel bridges on approach to St. Pancras Station. Live load tests with 130 tonne locomotive
1999 Incremental load testing of cantilever/suspended spans across overhead electrified lines, Cumbria.
1998 Incremental load testing of post-tensioned deck crossing third rail electrified lines, East Sussex.
1997 Live load testing of segmental motorway bridge crossing twin tracks, Northern Ireland.
1997 Demolition of redundant 3-span wrought iron bridge crossing 4-track main line, London.
1996 Load testing and long-term monitoring of 3-span structure crossing overhead-electrified lines, Hertfordshire.
1995 Selective demolition of 3-span skew masonry arch over main line, London.
Demolition of wrought iron railway bridge.