Two kinds of parapets of British Aluminium Co are specified -- P1 barrier for roadway underbridges which is able to contain 30 cwt vehicle striking it at 70 mph at angle of 20°, and P2 system for roadway overbridges where demands are similar except that speed limit is reduced to 50 mph; design of systems is so arranged that at predetermined load posts fail, thus allowing rails to absorb impact energy from vehicle by stretching or elongating. (14143)
Aluminium bridge parapets designed to increase safety
Surv -- Local Govt Technol
Surveyor -- Local Government Technology ; 132 , n 3970
1968
Article (Journal)
English
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High-early stress and premature cracking of reconstructed concrete bridge parapets
British Library Conference Proceedings | 1998
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