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GB 50206-2012 English PDF (GB50206-2012)

GB 50206-2012 English PDF (GB50206-2012)

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GB 50206-2012: Code for acceptance of construction quality of timber structures

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. 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.
GB 50206-2012
NATIONAL STANDARD OF THE
PEOPLE 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-laminate...

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