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Full and Partial Structures of Historical Roof Trusses in Assessment of Volume of Timber Used for Construction

Magdalena CHYLEWSKA-SZABAT
Magdalena CHYLEWSKA-SZABAT
   | Apr 04, 2019
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Published Online: Apr 04, 2019
Page range: 7 - 11
Received: Nov 06, 2017
Accepted: Aug 23, 2018
DOI: https://doi.org/10.21307/acee-2018-033
Keywords
© 2018 Magdalena Chylewska-Szabat et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1.

Classification of rafter framings according to J. Tajchman (source: J. Tajchman 2010) a) scheme of rafter framing with collar tie (made in Middle Ages) b)scheme of rafter framing made in modern times
Classification of rafter framings according to J. Tajchman (source: J. Tajchman 2010) a) scheme of rafter framing with collar tie (made in Middle Ages) b)scheme of rafter framing made in modern times

Figure 2.

Church of the Archangel Michael in Wierzbnik (source: D. Bajno archives)
Church of the Archangel Michael in Wierzbnik (source: D. Bajno archives)

Figure 3.

Roof framings based on lying secondary rafters and hanging king post pattern (source: D. Bajno archives)
Roof framings based on lying secondary rafters and hanging king post pattern (source: D. Bajno archives)

Figure 4.

Roof framings based on collar tie pattern (source: D. Bajno archives)
Roof framings based on collar tie pattern (source: D. Bajno archives)

Figure 5.

Sequence of full and partial patterns in the analyzed rafter framing (source: D. Bajno archives)
Sequence of full and partial patterns in the analyzed rafter framing (source: D. Bajno archives)

Consumption of construction timber for the construction of truss type 2 (Figure 4)

TIMBER VOLUME INROOF TRUSSES BY MODULE 2
Type of module: full-full-full (module length – 3m) Type of module: incomplete-full-incomplete (module length – 3 m)
Number of units Roof truss volume Module volume Number of units Roof truss volume Module volume
Full roof framings of type 1A 3 trusses 2.01 6.03 1 truss 2.01 2.01
Incomplete roof framings of type 1B - - - 2 trusses 1.28 2.56
Purlins connecting trusses spatially (8pcs) 3m 0.34 1.02 3 m 0.34 1.02
TOTAL MODULE VOLUME 14.31 m3 TOTAL MODULE VOLUME 10.21 m3
PERCENTAGE OF TIMBER USED
module consisting of three full roof framings 100.0% module consisting of one full and two incomplete roof framings 79.3%

Consumption of construction timber for the construction of roof framing type 1 (Figure 3)

TIMBER VOLUME IN ROOF TRUSSES BY MODULE 1
Type of module: full-full-full (module length – 3 m) Type of module: incomplete-full-incomplete (module length – 3 m)
Number of units Roof truss volume Module volume Number of units Roof truss volume Module volume
Full roof framings of type 1A 3 trusses 4.39 13.17 1 truss 4.39 4.39
Incomplete roof framings of type 1B - - - 2 trusses 2.34 4.68
Purlins connecting trusses spatially (7pcs) 3 m 0.38 1.14 3m 0.38 1.14
TOTAL MODULE VOLUME 14.31 m3 TOTAL MODULE VOLUME 10.21 m3
PERCENTAGE OF TIMBER USED
module consisting of three full roof framings 100.0% module consisting of one full and two incomplete roof framings 71.3%
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