Transactions . ?r::^c>-L-r:;^-r;;]-4-^^l^^ Clarks Beam. Sides of this B -Clear-span=72^—. EAM WERE NAILED EXACTLY LIKE FlG. 48. -s-r-rt No. 62. Four pieces deep, superimposed like-big. 50, forming a beam inches deep. Struts of Fig. 5o. Clear-span- 72- Clarks Beam, built of four sticks. white pine, secured by wire nails. Broke at 2700pounds. 796 THE EFFICIENCY OF BUILT-UP WOODEN BEAMS. Summary of Clarks Beams. Number of Beam. Ratio of Span to Depth of Beam. Breaking 5152 53545556575859606162 12,80012,50013,
Transactions . ?r::^c>-L-r:;^-r;;]-4-^^l^^ Clarks Beam. Sides of this B -Clear-span=72^—. EAM WERE NAILED EXACTLY LIKE FlG. 48. -s-r-rt No. 62. Four pieces deep, superimposed like-big. 50, forming a beam inches deep. Struts of Fig. 5o. Clear-span- 72- Clarks Beam, built of four sticks. white pine, secured by wire nails. Broke at 2700pounds. 796 THE EFFICIENCY OF BUILT-UP WOODEN BEAMS. Summary of Clarks Beams. Number of Beam. Ratio of Span to Depth of Beam. Breaking 5152 53545556575859606162 12,80012,50013,84013,20016,67011,65015,00016,69013,20014,S008,1402,700 Average. Cent. 6». These figures clearly prove the low efficiency of Clarksbeam, and likewise indicate that this efficiency will he less forsmall than for large ratios of span to depth of beam, since inthe former case the unit shearing-stresses are increased. Xos. H- 4*- ffdit -9- —10--- 10-- -4-^4- ~^~ -4- TT -H- i I -X Pip^ -TT s -r Glear-span = 72-- Piped Beam built of four sticks, with % bolts through pipes. 61 and 62 bear out the statement that in general the greaterthe number of pieces used, the less efficient the beam. XIII.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
