1e06-01 structural timber

8/12/2019 1E06-01 Structural Timber

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1E6 Structural timber and glulam

Petr Kuklk

Anna Kuklkov


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Content

Introduction

Grading andevaluation

Visual grading Stress grading

Penetration method

Determination ofproperties

Engineered wood

Glulam

- production process

- material properties

- versatility

- design cosideration

- structural use of glulam

- typical structures


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Introduction

... The two products wood, in the sense of clear

defect-free wood and timber, in the sense ofcommercial timber have to be considered astwo different materials and that must be

respected when strength properties aredeveloped for engineering purposes. ...


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Grading and evaluation

Visual grading method Stress grading method

Evaluation methods

- Penetration method

- Others NDT methods

- Stress wave method

- Ultrasound method

- Impact sounding method

- Pull out method


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Visual grading

93,8 96,3 95,596,6

6,9 6,3 9,1153,7

2,30

3,4

0

102030405060

708090

100

A B C Average

%KnotSlope of grain

Annual ring


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Stress grading


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Penetration method


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relationship between the depth of

penetration and density

][g/cm312

2019181716151413121110

0,7

0,6

0,5

0,4

0,3

0,2

98765 [mm]t 12,p

987727,0t102027,0 12,p12 +=

( )w007,01tt p12,p =

12ww =


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correlation between properties


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contribution of NDT

27

27

22

27

22

22

Bending strength

according to NAD

SN P EN 1995-1-1 andSN P EN 1995-2

[MPa]

77,2261,395537S 13

55,4139,775409S 13

50,9044,040492S 10

49,3731,282437S 13

41,5034,221402S 10

40,0433,983460S 10

Strength

test

[MPa]

Strength

calculation

[MPa]

Density

[kg/m3]Strength class

according to

SN 73 2824-1(idt DIN 4074)


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Determination of properties


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test results (spruce)

50,8814 57715,02,100,2047921

27,328 67559,03,530,2547320

24,336 71860,03,720,3040619

69,7914 19544,01,450,1053918

61,6817 24443,01,510,3054117

75,8116 18414,01,000,1255416

39,5414 03714,01,800,2445015

47,0411 65027,02,650,2644114

51,9313 22519,01,590,2244913

55,8511 3752,01,430,2243712

77,2218 19742,00,880,1753711

fmEstat

Slope

of

grain

Annual

ring

Knot

ratio12

Specimen


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factor for calculation

00,6

50 100 150 200 250

0,7

0,8

0,9

1,0

1

2

3

4

5A

B

ks

A - number of samplesB - number of specimens in the sample


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strength properties

350370380k

Density

330420500G05

500630750Gmean

Shear

modulus

180220270E90,05

270330400E90,mean

5 4006 7008 000E0,05

8 00010 00012 000E0,mean

Modulusof elasticity

1,82,42,5fv,k

Shear

4,65,15,1fc,90,k

172022fc,0,k

Compression

0,30,30,3ft,90,k

101316ft,0,k

Tension

162227fm,k

Bending

S 7S 10S 13

(spruce, fir, pine, larch)

Coniferous

Strength classes

Characteristic values

(in MPa)

Strength properties


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timber quality

0 1,62,52

67 69 65 67,2

32,52933 31,2

0

10

20

3040

50

60

7080

A B C Average

%

C16

C22

C27


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Engineered wood products

Target:

HOMOGENISATION OF MATERIAL PROPERTIES

Decreasing influence of anisotropic effects on

the mechanical properties (strength / stiffness) Decreasing influence of changes of the moisture content Possibility for the production of 2D-elements (plates,panels)

Engineered Wood ProductsStructural timber

Cutting / sawing of logs in longitudinaland transversal direction

from cutting/chipping of logs/round timberand/or structural timber into particles and

subsequently bonding by means of adhesives

Roundwood, Logs


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Glulam


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production process


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material properties


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versatility


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design considerations

Aesthetics

Prefabrication

Transport anderection


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structural use of glulam

Elephant house in Cologne Europabrcke in Murau, Austria


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typical structures

Beams


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Three-pin truss


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Portal frames


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Arches


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Thank you

for your kind attention!

27

1e06-01 structural timber

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