GB 50206-2012 PDF English (GB 50206-2002: Older version)
Standard Briefing:Stadard ID: GB 50206-2012 Stadard Title: Code for acceptance of construction quality of timber structures Price (USD): 165 Lead time: 9 seconds. Download online + auto-delivery via email (Full-Copy in True-PDF & Invoice). Click to see step-by-step procedureStatus: Valid Evolution and Historical Versions:
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Contents, Scope, and Excerpt:GB 50206-2012
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50206-2012
Code for Acceptance of Construction
Quality of Timber Structures
ISSUED ON: MARCH 30, 2012
IMPLEMENTED ON: AUGUST 1, 2012
Issued by: Ministry of Housing and Urban-Rural Development of the
People's Republic of China;
General Administration of Quality Supervision, Inspection
and Quarantine of the People's Republic of China.
Table of Contents
Foreword ... 4
1 General Provisions ... 8
2 Terms ... 9
3 Basic Requirements ... 14
4 Rough Sawn and Round Timber Structure ... 17
4.1 General Requirements ... 17
4.2 Dominant Items ... 17
4.3 General Items ... 22
5 Glued-laminated Timber Structure ... 25
5.1 General Requirements ... 25
5.2 Dominant Items ... 25
5.3 General Items ... 27
6 Light Wood Frame Construction ... 30
6.1 General Requirements ... 30
6.2 Dominant Items ... 30
6.3 General Items ... 33
7 Protection of Timber Structure ... 37
7.1 General Requirements ... 37
7.2 Dominant Items ... 37
7.3 General Items ... 41
8 Acceptance of Sub-subsection Project of Timber Structure ... 43
Appendix A Timber Strength Grade Inspection Method ... 44
Appendix B Standard for Materials of Rough Sawn Timber, Log and Panel 45
Appendix C Inspection Method for Moisture Content of Timber ... 48
Appendix D Bending Test of Steel Nail ... 50
Appendix E Allowable Error for Manufacture and Installation of Wood
Structure ... 53
Appendix F Test Method for Mechanical Property of Bending Wood Members
... 58
Appendix G Inspection Method for Material Grade of Dimension Lumber 62
Appendix H Mechanical Properties Index of Wood-based Structural Panel 71
Appendix J Requirements for Nailed Connection of Light Wood Frame
Construction Designed Based on Structure ... 73
Appendix K Requirements for Retention and Penetration of Various
Protective-treated Wood Members ... 75
Explanation of Wording in this Code ... 79
List of Quoted Standards ... 80
Code for Acceptance of Construction
Quality of Timber Structures
1 General Provisions
1.0.1 This code is formulated with a view to strengthening the quality management
of construction work, unifying the construction quality acceptance of timber work and
guaranteeing the project quality.
1.0.2 This code is applicable to the construction quality acceptance for timber
structure works like rough sawn and round timber structure, glued-laminated timber
structure and light wood frame construction.
1.0.3 The construction quality acceptance of timber structure work shall be based on
engineering design document. The requirements of construction quality acceptance in
design document and engineering contracting contract shall not be lower than those
specified in this code.
1.0.4 This code shall be used together with the current national standard "Unified
Standard for Constructional Quality Acceptance of Building Engineering" (GB 50300).
1.0.5 The construction quality acceptance for timber structure work shall not only
meet the requirements in this code, but also comply with those specified in the current
relevant ones of the nation.
2 Terms
2.0.1 Rough sawn and round timber structure
Load bearing member structure manufactured from rough sawn timber (including slab)
or log.
2.0.2 Glued-laminated timber structure
Load bearing member structure manufactured from glued-laminated timber.
2.0.3 Light wood frame construction
Wood structure composed of shear wall and tabula (floor system and roof)
manufactured from dimension lumber and wood-based structural panel through nailed
connection, generally used for 1~3F buildings.
2.0.4 Dimension lumber
A kind of wood product made through drying, polishing, grading and stamping on a
series of log sawn timber with section width and height within certain limits.
2.0.5 Visually stress-graded dimension lumber
The dimension lumber for which the lumber and strength grade are divided according
to the severity of various defects visible to naked eyes based on the specified
standard.
2.0.6 Machine stress-grated dimension lumber
The dimension lumber for which nondestructive test is carried out with mechanical
stress determination equipment, and the lumber grade and strength grade are divided
according to the measured elasticity modulus or other physical and mechanical
indexes based on the specified standard, hereinafter referred to as machine
stress-graded dimension lumber.
2.0.7 Log
Cut down trunk, removing bark, branch and treetop.
2.0.8 Rough sawn timber
tension and shear force between members, and are mainly used for connection of
timber truss nodes manufactured with dimension lumbers.
2.0.16 Truss connected with truss plates
The truss made of dimension lumber together with truss plate, which is mainly used
for the floor system and roof load bearing member of the light wood frame
construction.
2.0.17 Nailed connection
A pin connection type transmitting acting force between members through utilizing the
bending resistance and shear capacity of the round nail and the pressure-bearing
capacity of the nail hole wall.
2.0.18 Bolted connection
A pin connection type transmitting acting force between members through utilizing the
bending resistance and shear capacity of the bolt and the pressure-bearing capacity
of the bolt hole wall.
2.0.19 Step joint
A connection type transmitting acting force between members through utilizing the
pressure-bearing and shear capacity where the wood member is grooved to bear
another wood member.
2.0.20 Stud
The vertical member in the wall of light wood frame construction, serving as the main
compression member and guaranteeing the stability and integrity of the out-of-plane
structural sheathing.
2.0.21 Structural sheathing
Wood-based structural panel of light wood frame construction which is nailed on
single side or both sides of the wall timber frame, or on the top surface of the floor joist
or rafter, respectively referred to as wall panel, floor panel and roof panel.
2.0.22 Joist
The bending wood member with relatively small section size (including wood I-joist)
used for floor system or ceiling, which is respectively referred to as floor joist or ceiling
joist.
The stamp pattern indicating the place of origin, manufacturer, quality grade,
specification, executive standard, certification body etc. of the material, member and
accessory.
2.0.32 Inspection lot
The inspection body composed of a certain quantity of samples collected for
inspection according to the same production condition or the specified mode.
2.0.33 Product lot
The inspection scope divided due to the difference of material, manufacturing,
approach time or production batch within the range of the specified inspection lot.
2.0.34 On-site acceptance
The inspection carried out for the materials, members, accessories and equipment
approaching the construction site according to relevant standard requirements so as
to verify whether the product quality is acceptable or not.
2.0.35 Handover inspection
The verification activity for the construction quality through mutual inspection by the
undertaking party of the next procedure and the completing party of the previous
procedure for the completed procedures.
2.0.36 Evidential testing
The test carried out by the testing organization with corresponding qualification
through field sampling by personnel concerned of the construction organization under
the supervision of supervision organization or construction organization.
timber and the timber surface shall be polished with abrasive paper.
2 Grade B: structural member is exposed, the painting on appearance is
mechanically polished; occasional skips-in-planting and tiny defect and gap are
allowable on the surface but the hole on floppy node is unallowable.
3 Grade C: structural member is not exposed, and the member surface is not
required to be processed or polished.
3.0.6 Construction quality of timber structure project shall be controlled according to
the following requirements:
1 Design document of this project shall be provided.
2 On-site acceptance shall be carried out for the timber, wood product, steel and
connector used for the timber structure project. For materials or semi-finished
products involved in structure safety and use function, evidential testing shall be
carried out according to this code or corresponding professional engineering quality
acceptance standard, and the sampling and delivery for inspection shall be carried out
under the supervision of supervision engineer or the technical principal of the
construction organization.
3 Quality control for each procedure shall be carried out according to the relevant
requirements of this code; inspection shall be carried out on completion of each
procedure.
4 Handover inspection shall be carried out for relevant disciplines, and shall be
recorded. The construction of next procedure shall not be carried out without the
inspection by the supervision engineer and the technical principal of construction
organization.
5 Completion documents like completion drawing and written materials of timber
structure project shall be provided.
3.0.7 Where new technology (new material, new structure and new process)
required for timber structure construction hasn't listed in current relevant national
standard, the construction organization shall obtain the approval of the local
competent administrative department of construction engineering quality, and
organize expert panel to demonstrate together with the design, supervision and
construction organizations; meanwhile, it shall determine the construction quality
acceptance method and inspection standard, hereby determine the dominant item for
the construction of relevant timber structure project.
3.0.8 The lumber grade of the material, member and accessory adopted for the
round steel adopted for lower chord of wood-and-steel composite truss, not only the
performance inspection for tensile yield strength, ultimate strength and elongation, but
also the cold bending inspection shall be carried out. It shall also meet the round steel
material standard specified in design document.
Inspection quantity: randomly take 2 pieces from each steel species in each
inspection lot.
Inspection method: the sampling method, sample preparation and tensile test method
shall respectively comply with the relevant requirements of the current national
standards "Rules for Sampling in Mechanical and Technological Testing of Steel
Products" (GB 2975) and "Metallic Materials - Test Pieces for Tensile Testing" (GB
6397) and "Metallic Materials -Tensile Testing at Ambient Temperature" (GB/T 228).
4.2.7 Electrodes shall meet the requirements of the current national standard
"Carbon Steel Covered Electrodes" (GB 5117) and "Low Alloy Steel Covered
Electrodes" (GB 5118); their type shall be matched with the adopted steel and they
shall have product quality certificate.
Inspection quantity: total number of inspection lot.
Inspection method: inspect by comparison between physical object and product
quality certificate.
4.2.8 The bolt and nut shall have product quality certificate, and their performance
shall meet the requirements of the current national standard "Hexagon Head Bolts"
(GB 5782) and "Hexagon Head Bolts - Product Grade C" (GB 5780).
Inspection quantity: total number of inspection lot.
Inspection method: inspect by comparison between physical object and product
quality certificate.
4.2.9 The round nail shall have product quality certificate, and its performance shall
meet the relevant requirements of the current professional standard "Round Nails for
General Uses" (YB/T 5002). Evidential testing for bending strength of nail shall be
carried out where the bending yield strength of nail is specified in design document.
Inspection quantity: randomly take 10 round nails from each specification in each
inspection lot.
Inspection method: inspect the product quality certificate and testing report. Strength
evidential testing method shall meet those specified Appendix D of this code.
4.2.10 Round steel tie bar shall meet the following requirements:
1 The round steel tie bar shall be straight and flat, and double-side splice welding
shall be adopted for the joint. The splice diameter shall not be less than 75% of the tie
bar diameter, and the length on one side of the joint shall not be less than 4 times of
the tie bar diameter. The weld leg height and weld length shall meet the requirements
of the design document.
2 The subplate under the nut shall meet the requirements of the design document
and shall not be less than the requirements of Item 2 in Article 4.3.3 of this code.
3 Where the diameter of the lower chord round steel tie bar of wood-and-steel
composite truss, the main tension web rod of truss and the pedal-type node tie bar
and bolt is greater than 20mm, double-nut self-locking shall be adopted. The
protruding length of screw rod from the nut shall not be less than 80% of the screw rod
diameter.
Inspection quantity: total number of inspection lot.
Inspection method: measurement, inspection of handover inspection report.
4.2.11 For the bearing steel member, the height of node weld leg shall not be less
than the requirements of design document; unless otherwise stated in the design
document, the weld quality shall not be less than Grade III while that of the tension
member working below -30 shall not be less than Grade II.
Inspection quantity: all stressed welds of the inspection lot.
Inspection method: inspect according to the relevant requirements of the current
professional standard "Technical Specification for Welding of Steel Structure of
Building" (JGJ 81), and inspect the handover inspection report.
4.2.12 The specification and quantity of connectors (nails and bolts) used for
nailed connection and bolted connection shall meet the requirements of the
design document.
Inspection quantity: total number of inspection lot.
Inspection method: visual inspection and measurement.
4.2.13 For the step joint of timber truss support node, the end timber shall be free
from defects like rotting, cracking and diagonal grain, and the shear surface shall not
be located on the pith side of timber; for bolted tension joint, the timber and
connecting plate of connection segment shall be made of Ia material and shall meet
4 The column and foundation shall be connected with pre-embedded angle steel,
and shall be fixed with bolt.
5 For wooden roof building, the purline in node position shall be fixed on the
horizontal beam embedded part of the gable and internal cross wall; the bearing
length shall not be less than 120mm, and reliable bolt anchoring shall be provided.
Inspection quantity: total number of inspection lot.
Inspection method: visual inspection and measurement.
4.3 General Items
4.3.1 The allowable deviation for the manufacturing of various log and rough sawn
timber members shall not exceed the requirements of Table E.0.1 in this code.
Inspection quantity: total number of inspection lot.
Inspection method: see Table E.0.1 in this code.
4.3.2 Step joint shall meet the following requirements:
1 The bearing surface shall not only meet the requirements of the design document,
but also be vertical to the axis of compression rod. the axis of compression rod for
single step joint shall pass through the center of bearing surface; for double step joint,
the first tooth end shall be located in the intersection point of the top edges of upper
and lower chord rods, and the second tooth end shall be located in the intersection
point of the upper cord axis and the lower chord top edge; the second tooth bearing
surface shall be deeper than the first tooth bearing surface by 20mm at least.
2 The bearing surface shall be flat and smooth, and the partial gap shall not exceed
1mm; about 5mm wedge-shaped gap shall be remained at the outer opening of the
non-bearing surface.
3 The safety bolt at the step joint of truss support shall be vertical to the upper cord
axis; the wood web rod and upper/lower chord rod shall be fastened with clincher.
4 For the center line of crosser of truss end support, the rough sawn timber truss
shall pass the intersection point of the center lines in net sections of upper/lower
chord rods; the log truss shall pass through the intersection point of the center lines in
gross sections of upper/lower chord rods.
Inspection quantity: total number of inspection lot.
bearing surface vertical to member axis shall be adopted; the thickness of cover plate
on both sides shall not be less than 50% of the butt joint member width, while the
height shall be consistent with that of the butt member. The bearing surface shall be
sawn flatly and mutually tightened, and the partial gap shall not exceed 1mm. The bolt
diameter, quantity and arrangement shall meet the requirements of the design
document.
Inspection quantity: total number of inspection lot.
Inspection method: visual inspection, measurement, inspection of handover
inspection report.
4.3.6 The allowable deviation for installation of timber truss, beam and column shall
not exceed the requirements of Table E.0.2 in this code.
Inspection quantity: total number of inspection lot.
Inspection method: see Table E.0.2 in this code.
4.3.7 The allowable deviation for installation of roof timber frame shall not exceed
the requirements of Table E.0.3 in this code.
Inspection quantity: total number of inspection lot.
Inspection method: visual inspection and measurement.
4.3.8 The integrity of roof structure support system shall meet those specified in
design document.
Inspection quantity: total number of inspection lot.
Inspection method: contrast with design document, measurement of physical object
and inspection of handover inspection report.
5 Glued-laminated Timber Structure
5.1 General Requirements
5.1.1 This chapter is applicable to the acceptance of construction quality of timber
structure with main load bearing member manufactured and installed with
glued-laminated timber.
5.1.2 The ordinary glued-laminated timber and visually-graded or
mechanically-graded equivalent composite glued-laminated timber respectively glued
with ordinary glued-laminated timber lamination and visually-graded or
mechanically-graded lamination according to the specified member section
combination of laminations, as well as the inequivalent composite symmetrical and
asymmetrical composite glued-laminated timber may be adopted for the
glued-laminated timber.
5.1.3 Glued-laminated timber shall be manufactured by professional processing
enterprise passing qualification certification.
5.1.4 A building of glued-laminated timber structure shall be regarded as an
inspection lot for the quality control of materials, members and accessories; a floor of
a whole building or a floor between the deformation joints shall be regarded as an
inspection lot for the quality control of member manufacturing and installation.
5.2 Dominant Items
5.2.1 The structure type, structural arrangement and member section size
shall meet the requirements of the design document.
Inspection quantity: total number of inspection lot.
Inspection method: comparison between physical object and design document;
measurement.
5.2.2 The category, strength grade and combination of laminations of
structural glued-laminated timber shall meet the requirements of the design
document, and shall also have product quality certificate and product stamp;
meanwhile, integrity inspection for glue line and strength test for lamination
finger joint meeting the requirements of product standard shall be available.
Inspection quantity: total number of inspection lot.
5.2.7 The category, specification and quantity of connector in each connection
node shall meet the requirements of the design document. The shear section on
the end of glued-laminated timber at the step joint of truss end node and the
bolt position in bolted connection shall not be overlapped with the leaked glue
line.
Inspection quantity: total number of inspection lot.
Inspection method: visual inspection and measurement.
5.3 General Items
5.3.1 The construction and appearance of glued-laminated timber shall meet the
following requirements:
1 The wood grain of each layer of wood board of glued-laminated timber shall be
parallel to the length direction of the member. Each layer of wood board in length
direction shall be of finger joint. The finger joint spacing on the same lamination within
the range of 1/10 the section height of the tension area of tension member and
bending member shall not be less than 1.5m; the finger joint position between the
upper and lower laminations shall be staggered by not less than 10 times the
thickness of wood board. Plain adapter may be adopted for lamination in width
direction; however, the joint between the upper and lower laminations shall not be less
than 40mm.
2 The glue line of glued-laminated timber shall be uniform, and the thickness shall
be 0.1~0.3mm. The continuous length of the glue line with thickness exceeding
0.3mm shall not be greater than 300mm, and the thickness shall not exceed 1mm.
The leakage length in the member position withstanding the plane shear force parallel
to glue line shall not be greater than 75mm while that in other positions shall not be
greater than 150mm. Under the Category 3 operating environment condition, the plain
joint and in the width direction of lamination and the plate bottom groove shall be filled
up with glue.
6 Light Wood Frame Construction
6.1 General Requirements
6.1.1 This chapter is applicable to the acceptance of construction quality of timber
structure manufactured and installed with main materials of dimension lumber and
wood-based structural panel.
6.1.2 For the quality control of material, member and accessory of light wood frame
construction, the light wood frame construction building in the same development
project and constructed at the same period, with each building area not exceeding
300m2 and total building area not exceeding 3000m2 are considered as an inspection
lot; the one with total area less than 3000m2 shall be considered as one inspection lot,
while that with individual building area exceeding 300m2 shall be separately
considered as an inspection lot; for the quality control for manufacture and installation
of light wood frame construction, one floor of one building shall be considered as an
inspection lot.
6.2 Dominant Items
6.2.1 The arrangement and anti-overturning measures of load bearing wall
(including shear wall), column, floor system and roof of light wood frame
construction, and anti-disengaging measures of roof shall meet the
requirements of design document.
Inspection quantity: total number of inspection lot.
Inspection method: comparison between physical object and design document.
6.2.2 Dimension lumber approaching the construction site shall be provided
with product quality certificate and product stamp.
Inspection quantity: total number of inspection lot.
Inspection method: comparison between physical object and certificate.
6.2.3 For each product lot of visually-graded dimension lumber approaching the
construction site, visual grade evidential testing or bending strength evidential testing
shall be carried out by qualified professional grading personnel; bending strength
evidential testing shall be carried out for each product lot of machine rated dimension
lumber approaching the construction site and requirements in Appendix G of this code
shall be met.
report for plane-bending or edge-on bending performance specified in the design
document.
Structural performance inspection shall be carried out for bending members of wood
I-joist and structural composite lumber (SCL) approaching the construction site under
the action of standard load effect combination; under the action of the inspection load,
the member shall be free from damages like cracking; the maximum deflection shall
not be greater than those specified in Table 5.2.3 and the average mid-span deflection
shall not be greater than 1.13 times of the theoretical calculation value.
Inspection quantity: randomly take 3 sticks from each specification in each inspection
lot.
Inspection method: inspect the product quality certificate, inspection report for
material strength and elasticity modulus of structural composite lumber (SCL) as well
as inspection report for member performance according to those specified in
Appendix F of this code.
6.2.8 Truss connected with truss plates shall be processed and manufactured by
professional processing plant and be provided with product quality certificate.
Inspection quantity: total number of inspection lot.
Inspection method: inspect by comparison between physical object and product
quality certificate.
6.2.9 Steel, electrode, bolt and round nail shall meet those specified in Articles
4.2.6~4.2.9 of this code.
6.2.10 Metal connector shall be molded through punching and be provided with
product quality certificate and material qualification guarantee. The thickness of
galvanized rust-proof layer shall not be less than 275g/m2.
Inspection quantity: total number of inspection lot.
Inspection method: inspect by comparison between physical object and product
quality certificate.
6.2.11 For light wood frame construction, the specification of metal connector
connecting each member as well as specification and quantity of nail used for
nailed connection shall meet the requirements of design document.
Inspection quantity: total number of inspection lot.
Inspection method: visual inspection and measurement.
6.2.12 Where structure design is adopted, the nailed connection among each
member shall not be lower than those specified in Appendix J of this code.
Inspection quantity: total number of inspection lot.
Inspection method: visual inspection and measurement.
6.3 General Items
6.3.1 The following items of load bearing wall (including shear wall) shall meet the
requirements of design document and shall not be lower than relevant structural
requirements in current national standard "Code for Design of Timber Structures" (GB
50005).
1 Stud spacing.
2 Wall terminal, both sides of opening, wall corner and the junction; the arrangement
and quantity of stud.
3 Size and position of stud slotting or opening.
4 Corrosion- and moisture- proof of ground beam plate and anchoring measures for
foundation.
5 Number of stories of wall raising-plate dimension lumber, joint treatment and the
arrangement of two-floor raising-plate at wall corner and the junction.
6 The grade, thickness and nailing arrangement mode of wall structural sheathing.
7 The spacing between wall structural sheathing and nail f......
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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