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Geometric design standards for narrow curves in hilly terrain of Sri Lanka

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dc.contributor.author Salawavidana, SAST
dc.contributor.editor Pasindu, HR
dc.date.accessioned 2022-09-12T08:40:59Z
dc.date.available 2022-09-12T08:40:59Z
dc.date.issued 2011-07
dc.identifier.citation ....********....... en_US
dc.identifier.uri http://dl.lib.uom.lk/handle/123/19032
dc.description.abstract Geometric designs of national roads in the remote areas of Sri Lanka are involved with the economic constraints. Therefore, following the accepted design standards is not practical in many of the occasions. The reasons for this are narrow curves, steep grades and the combination of the both. Funds are not readily available for improvement of these narrow curves in remote areas to suit the accepted design standards. In such circumstances the design engineer is compelled to go for substandard designs. This is not an acceptable practice because such substandard designs lack the reliability and integrity of the design process that is a prime objective of any design standards. The minimum design speed is 30kmph and the minimum curve radius is 25m in the conventional highway design practice as used in Sri Lanka, which is a combination of AASHTO and AUSTROADS. But it is common to find curve radii lesser than these values. There is no such design standard for narrow curve design relevant to Sri Lankan conditions at present. But in other countries, low speeds are used to design the curves. Those design standards cannot be used in Sri Lanka as it is because they use different parameters and assumptions compared to Sri Lankan Standards. In this research, such a design standard was derived using the concept of Factor of Safety in minimum curve radius. With this design standard, it is possible to extend the lower margin of the radii range up to 13m and the lower margin of the design speeds up to 20kmph.Further, a suitable vertical design standard has been derived to cater the above horizontal design standards. en_US
dc.language.iso en en_US
dc.publisher Department of Civil Engineering en_US
dc.subject Design Standards en_US
dc.subject Narrow Curves en_US
dc.title Geometric design standards for narrow curves in hilly terrain of Sri Lanka en_US
dc.type Conference-Abstract en_US
dc.identifier.faculty Engineering en_US
dc.identifier.department Department of Civil Engineering en_US
dc.identifier.year 2011 en_US
dc.identifier.conference International conference on Advances in Highway Engineering & Transportation Systems en_US
dc.identifier.place Colombo en_US
dc.identifier.pgnos p. 35 en_US
dc.identifier.proceeding Proceedings of Advances in Highway Engineering & Transportation Systems 2011 en_US


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