The Masonry Arch PDF
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Spanning the Centuries - The Masonry Arch Gary Salter BE, MSc, C.Eng, MICE, MCIWEM, MIHT. Conservation Accredited Engineer 18/11/2013 Gary Salter C Purpose of talk: to raise awareness of stone arch bridges in Ireland • To illustrate the long history, amazing durability and inherent strength of masonry arches • There are over 18,000 masonry bridges supporting public roads in Ireland. Most are over 150 years old and need repair • To demonstrate repairs are preferable and usually cheaper than replacement • To show a conservation approach is practical and can and should be used. • Engineers are, or should be, custodians of this huge infrastructural heritage asset and have a responsibility to society to conserve these structures for future generations. 18/11/2013 Gary Salter C Plan for talk • A brief history of arches and shapes • A simple and elegant way to demonstrate arch behaviour discovered in the 17th century • Some Irish examples • Case studies of bridge works in Sligo 18/11/2013 Gary Salter C Probably the oldest bridging structures in the country 3000BC 18/11/2013 Gary Salter C 1800’s road bridge versions of post and lintol 18/11/2013 Gary Salter C Superstructure and substructure failure. Major repairs and new structural deck at €52k A replacement bridge would have cost about 50% more when complete. Where there is a will there is a way! By Direct Labour Sligo Co. Co. plus specialists, Colas Ltd. gs c 6 Very early lintel bridging and corbelled arch/dome. Circa 5000 years ago 18/11/2013 Gary Salter C Nineteenth century bridge corbelling – Co. Sligo. 18/11/2013 Gary Salter C Beams to arches 18/11/2013 Attributed to J Ruskin The Romans were masters of masonry arch building 18/11/2013 Attributed to goggle
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