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GB 50005-2017: Standard for design of timber structures
GB 50005-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50005-2017
Standard for design of timber structures
ISSUED ON. NOVEMBER 20, 2017
IMPLEMENTED ON. AUGUST 01, 2018
Issued by. Ministry of Housing and Urban-Rural Development of PRC;
General Administration of Quality Supervision, Inspection and
Quarantine.
Table of Contents
Foreword ... 7 
1 General provisions ... 10 
2 Terms and symbols ... 11 
2.1 Terms ... 11 
2.2 Symbols ... 16 
3 Materials ... 22 
3.1 Timber ... 22 
3.2 Steel and metal connector ... 26 
4 Basic requirements ... 29 
4.1 Basis of design ... 29 
4.2 Seismic design ... 31 
4.3 Design values and allowable deformation limits ... 34 
5 Calculation for members ... 47 
5.1 Axial tensile members and axial compression members ... 47 
5.2 Bending members ... 51 
5.3 Combined bending and axial loading members ... 57 
6 Design for connections ... 60 
6.1 Step joints ... 60 
6.2 Dowel-type fasteners ... 63 
6.3 Truss plates ... 73 
7 Sawn and log timber structures ... 83 
7.1 General requirements ... 83 
7.2 Posts and beams ... 86 
7.3 Walls ... 86 
7.4 Floors and roofs ... 92 
7.5 Trusses ... 95 
7.6 Skylights ... 98 
7.7 Bracings ... 100 
8 Glued laminated timber structures ... 104 
9 Light wood frame construction ... 107 
9.1 General requirements ... 107 
9.2 Floors and roofs ... 112 
9.3 Walls ... 115 
9.4 Light frame wood trusses ... 118 
9.5 Design of hybrid light wood frame construction ... 122 
9.6 Detailing requirements ... 124 
10 Fire design ... 134 
10.1 General requirements ... 134 
10.2 Construction details of fire protection ... 137 
11 Preservation of timber structures ... 142 
11.1 General requirements ... 142 
11.2 Waterproof and moisture dampproof ... 142 
11.3 Biological protection ... 144 
11.4 Wood preservation ... 146 
Appendix A Material criteria for load-bearing timber structures ... 147 
Appendix B Requirements for light wood frame constructions ... 161 
Appendix C Requirements for inspection and maintenance of timber structures
... 168 
Appendix D Design values of strength and modulus of elasticity for imported
structural timber ... 170 
Appendix E Characteristic values of strength and modulus of elasticity for
structural timber ... 180 
Appendix F Determination of characteristic values for manufactured structural
timber ... 190 
Appendix G Reference design values and calculation for cross laminated-
timber ... 193 
Appendix H Names of timber and main characteristics of common species in
this standard ... 197 
Appendix J Identification requirements, basic characteristics and main
processing properties of main imported timber ... 210 
Appendix K Determination of number of fasteners and group action factor
... 227 
Appendix L Specific gravities of commonly-used wood species ... 232 
Appendix M Design values of strength for truss plates ... 234 
Appendix N Design values of the shear strength for wood-based structural
panel shear walls ... 237 
Appendix P Design values of the shear strength for wood-based structural panel
floors and roofs ... 240 
Appendix Q Calculation method of vibration control for floor joists ... 246 
Appendix R Combustibility and fire resistance rating of timber members .. 251 
Explanation of wording in this standard ... 256 
List of quoted standards ... 257 
Standard for design of timber structures
1 General provisions
1.0.1 In order to implement the national technical and economic policies in the
design of timber structures, to achieve advanced technology, safety and
applicability, economic rationality, quality and environmental protection, this
standard is hereby formulated.
1.0.2 This standard applies to the design of swan and log timber structure, glued
laminated-timber structure, light-wood frame construction for construction
engineering.
1.0.3 In addition to complying with this standard, the design of the timber
structure shall also comply with the requirements of current relevant national
standards.
2 Terms and symbols
2.1 Terms
2.1.1
Timber structure
A load-bearing structure made of wood-based members.
2.1.2
Log
Short-cut wood which is made through branch-removal of the felled trunk
and bucking process.
2.1.3
Sawn timber
Finished or semi-finished materials which are made through bucking
process of logs, divided into plank and square timber.
2.1.4
Square timber
Sawn timber which has a right-angle sawing and a width-to-thickness ratio
of less than 3, also known as square-edged timber.
2.1.5
Plank
Sawn timber which has a right-angle sawing and a width-to-thickness ratio
more than or equal to 3.
2.1.6
Dimension lumber
The normalized timber which is made by processing the timber according to
the specified sizes of cross-sectional width and height.
2.1.7
Structural composite lumber
also known as laminated timber or structural glulam.
2.1.14
Cross laminated timber
A timber product obtained by laminating, assembling, gluing the orthogonal
laminates which have a thickness of 15 mm ~ 45 mm, also known as
orthogonal laminated timber.
2.1.15
Laminated log
A timber product obtained by gluing a sawn timber which has a thickness of
more than 30 mm and number of layers of not more than 4 in the direction
parallel to grain. It is commonly used in log cabins or beam-post timber
structure.
2.1.16
Wood I-joist
A bending member which has an I-shaped cross-section, formed by using
the dimension lumber or structural composite lumber as flange, the wood-
based structural planks as web, the structural adhesive for gluing.
2.1.17
Stud
Vertical load-bearing frame members in light wood frame structure which are
arranged at regular intervals.
2.1.18
Visually stressed-graded lumber
The timber the grade of which is determined by visual inspection.
2.1.19
Machine stress-rated lumber
The timber the strength grade of which is determined based on the timber’s
bending strength and elastic modulus which are obtained by using a
mechanical stress measuring device to carry out non-destructive test against
the timber.
An architectural structure consisting of timber-frame walls, floor panels, roof
systems which are made of dimension lumber, wood-based structural panels,
or gypsum board.
2.1.27
Glued laminated timber structures
An architectural structure whose load-bearing members are mainly made of
glued-timber, also known as glued laminated timber structure.
2.1.28
Log cabins; log house
The timber structure whose main load-bearing system is made from the well-
shaped timber wall which uses the logs, square timbers, laminated log
whose cross-section is appropriately processed as the basic members,
superimpose the members in layers upwards, uses the inter-layer cross-bite
connection at the intersection ends of the members.
2.1.29
CHUANDOU-style timber structure
According to the spacing of the roof purlin, erect a row of timber columns
along the depth direction of a house, the purlin is directly braced by column,
there is no beam between columns, which are laterally-tied by the square-
column which penetrates through the column, to form a truss of timber
structure. Use DOUFANG and pike to connect every two trusses of timber
structures to form a load-bea...