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Study on Connection Methods of Rafters in Korean Traditional Timber Structure

이형재 1

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ABSTRACT

In the technical book, issued in 1988, on Korean wooden architecture the 'double rafter' was defined as an informal construction to reduce the building load factor and this kind of construction had been adopted in 17-18 centuries, in the period of decline in Korean architecture. Nowadays it is suggested to classify the 'double rafter' by function into 'double rafter' and so-called 'rafter with deflected slope( weigh on roof beam)'. Rafter is one of the sloping beams that supports a pitched roof, therefore it is seriously influenced by weather condition and it is needed to repair and replace every 15-30 years in average. So the remained traditional buildings may not be an evidence for the occurrence of 'weigh on roof beam'. In order to estimate its occurrence it was needed to check the roof pitch in degrees, mechanism of weigh on roof beam, girder division etc. While in the traditional Korean buildings with cross-connecting rafters the roof pitch of long rafters are 27°, short rafters - 40°, in the buildings with 'weigh on roof beam', long rafters have 20° and short rafters - 27°. In China the narrow rafters are belonged to the more older types. An roof slope of the long rafter of Honganji in Horyuji is 20 degrees. Moreover, it is interesting that on the roofs of house-figure pottery in Han dynasty and Tamamushizushi in Horyuji can see the early type of 'double weigh on roof beam'. One of the distinct characteristics is rate of divide girder. There are not only 3 divide girder and 4 divide girder, but also girder with 1:1.5:1 division and 1.5:1:1.5 division. Consequently, investigated and analysed in this time structure is needed to call as "rafter weigh on beam" and it was established before the Kore dynasty, taking the similar structural factors from the traditional building.

Citation status

* References for papers published after 2023 are currently being built.