GB 50666-2011 PDF English
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GB 50666-2011: Code for construction of concrete structures---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB50666-2011
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50666-2011
Code for Construction of Concrete Structures
Issued on. JULY 29, 2011
Implemented on. AUGUST 1, 2012
Issued by. Ministry of Housing and Urban-Rural Development of PRC;
General Administration of Quality Supervision, Inspection and
Quarantine of PRC.
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Code for Construction of Concrete Structures
Chief Development Department. Ministry of Housing and Urban-Rural Development
of the People's Republic of China
Approval Department. Ministry of Housing and Urban-Rural Development of the
People's Republic of China
Implementation Date. August 1, 2012
Beijing 2011
Announcement of the Ministry of Housing and Urban-Rural
Development of the People's Republic of China
No. 1110
Announcement on Publishing the National Standard of "Code for
Construction of Concrete Structures"
"Code for Construction of Concrete Structures" has been approved as a national
standard with a serial number of GB 50666-2011 and will be implemented from
August 1, 2012.4.1.2, 5.1.3, 5.2.2, 6.1.3, 6.4.10, 7.2.4(2), 7.2.10, 7.6.3(1), 7.6.4 and
8.1.3 are compulsory provisions and must be enforced strictly.
Authorized by the Research Institute of Standards and Norms (RISN) of our ministry,
this Code is published and distributed by China Architecture and Building Press.
Ministry of Housing and Urban-Rural Development of the People's Republic of
China
July 29, 2011
Table of Contents
1 General Provisions... 9
2 Terms... 10
3 Basic Requirements... 12
4 Formwork... 15
5 Reinforcement... 27
6 Prestressed Concrete... 37
7 Concrete Production and Transportation... 51
8 Cast-in-situ Concrete... 63
9 Precast Concrete... 85
10 Construction in Cold, Hot and Rainy Weather... 97
11 Environmental Protection... 105
Appendix A -- Characteristic Value of Loads Acting on Formwork... 107
Appendix B -- Nominal Diameter, Nominal Sectional Area, Calculation Sectional Area and
Theoretical Weight of Common Reinforcement... 110
Appendix C -- Minimum Splicing Length of Longitudinal Reinforcement... 112
Appendix D -- Calculation and Measurement Method for Elongation of Prestressed
Tendon... 114
Appendix E -- Testing Method for Prestressing Loss Due to Friction... 116
Appendix F -- Specification of Concrete Materials... 118
Explanation of Wording in This Code... 124
List of Quoted Standards... 125
1 General Provisions
1.0.1 This Code is formulated with a view to implementing the national technical and
economic policies, ensuring the engineering quality, and realizing advanced
technology, reasonable process, resources conservation and environmental
protection during the construction of concrete structures.
1.0.2 This Code is applicable to the construction of concrete structures in building
engineering, not to the construction of lightweight aggregate concrete and special
concrete.
1.0.3 This Code contains the basic requirements for the construction of concrete
structures. When there are special requirements for the construction stated in the
design documents, the construction shall also be implemented in accordance with the
design documents.
1.0.4 Construction of concrete structures shall not only meet the requirements of this
Code but also comply with those in the current relevant standards of the nation.
2 Terms
2.0.1 Concrete structure
The structure mainly made of concrete, including plain concrete structure, reinforced
concrete structure and prestressed concrete structure, which may be classified into
cast-in-situ concrete structure and precast concrete structure according to the
construction method.
2.0.2 Cast-in-situ concrete structure
The concrete structure that is made by erecting formwork in situ and integral casting,
hereinafter referred to as cast-in-situ structure.
2.0.3 Precast concrete structure
The concrete structure that is made by assembling and connecting the precast
concrete members or parts, hereinafter referred to as precast structure.
2.0.4 Workability of concrete
The features that shall be possessed of by the concrete mixture in order to meet the
construction operation requirements and ensure the concrete uniformity and
compactness, mainly including flowability, cohesiveness and water-retaining property.
It is hereinafter referred to as workability of concrete.
2.0.9 Construction joint
It refers to the joint formed by segmented placing according to the design
requirements or the construction demands. The joints will be formed when concrete
continues to be placed after the previously-placed concrete reaches a certain
strength.
2.0.10 Post-cast strip
The concrete strip in certain width, placed after a certain time, which is reserved in
such structures as beam, slab (including foundation slab) and wall, in order to adapt to
the influence of such factors as the ambient temperature changes, concrete shrinkage
and structural differential settlement.
3 Basic Requirements
3.1 Construction Management
3.1.1 The construction organizations for the concrete structures shall have
corresponding qualification and establish corresponding quality management system
as well as construction quality control and inspection system.
3.1.2 Organization structuring and manning of construction project department shall
meet the construction management requirements of concrete structures. Construction
operation personnel shall receive training to acquire the basic knowledge and skills
required for their respective posts.
3.1.5 The construction organization shall establish specific construction schemes
according to the requirements of the design documents and construction organization
design, which shall be implemented after examined and approved by the supervision
organization.
3.1.6 Before construction of concrete structures, the construction organization shall
establish emergency plan upon the contingent hazards, disasters and emergencies at
the construction site. Technical disclosure and training shall be carried out for the
emergency plan, and drilling shall be carried out if necessary.
3.2 Construction Technology
3.2.1 Before construction of concrete structures, the construction process shall be
determined according to the structure types, characteristics and construction
conditions, and each preparation work shall be completed.
3.2.2 Construction process monitoring should be carried out and construction control
measures shall be timely adjusted for the concrete structures that have complex
shape, relatively large height or span, complex subgrade conditions and particular
construction environment conditions.
4 Formwork
4.1 General Requirements
4.1.1 Special construction scheme shall be prepared for the formwork. Technology
demonstration shall be carried out for the special construction schemes of tall
formwork support and such tool-type formwork as sliding formwork and creeping
formwork.
4.2 Materials
4.2.1 Technical indexes of formwork and support materials shall meet the
requirements of the current relevant standards of the Nation.
4.2.2 Light-weight, high-strength and durable materials should be used in the
formwork and support. The standard approved products should be selected as the
connection.
4.3 Design
4.3.1 Types and construction of formwork and support shall be determined according
to such conditions as engineering structure type, load, subsoil category, construction
equipment and material supply.
4.3.4 As for the design of formwork and support, the loads under different operating
conditions and their combinations shall be calculated according to the actual
conditions. Characteristic value of each load may be determined according to
Appendix A of this Code.
4.3.10 Height-width ratio of support should not be greater than 3, otherwise the overall
stability measures shall be strengthened.
4.3.13 In the case of continuous formwork erecting for multi-layer floor, it shall be
analyzed that the influence of load transfer between multi-layer floors on the support
and floor structure.
4.3.14 In the case of support column or vertical formwork supported on the soil layer,
the soil layer shall be checked according to the relevant requirements of the current
national standard "Code for Design of Building Foundation".
4.4 Fabrication and Installation
4.4.1 Formworks shall be processed and fabricated according to the drawings.
Strongly-universal formworks should be fabricated into the approved ones.
5 Reinforcement
5.1 General Requirements
5.1.1 Reinforcement should adopt the fabricated steel bar produced in a specialized
way.
5.2 Materials
5.2.1 Properties of the reinforcement shall meet the requirements of the current
relevant standards of the Nation. Nominal diameter, nominal sectional area,
calculation sectional area and theoretical weight of common reinforcement shall meet
the requirements of Appendix B of this Code.
5.2.3 During construction, measures shall be taken to prevent the confusion, rusting
or damage of reinforcement.
5.2.4 During construction, if there is brittle failure, poor welding performance or
obviously abnormal mechanical performance in the reinforcement, this batch of
reinforcement shall be taken out of service, and then chemical composition inspection
or other special inspection shall be carried out for this batch of reinforcement.
5.3 Reinforcement Fabrication
5.3.1 The surface of reinforcement shall be cleaned up before fabrication.
Reinforcement with granular or flaky old rust or damage shall not be used.
5.3.2 Reinforcement fabrication should be carried out under normal temperature.
During the fabrication process, the reinforcement shall not be heated. Reinforcement
shall be bent in place at one time.
5.4 Reinforcement Connection and Fixing
5.4.1 Reinforcement joints should be arranged at a position under small load; as for
the structure with requirements for seismic resistance, reinforcement joints should not
be arranged within the range of stirrup densified area at the beam end and column
end, within which area the reinforcement splicing shall not be carried out.
5.4.2 Reinforcement mechanical connection construction shall meet the following
requirements.
5.4.3 Reinforcement welding construction shall meet the following requirements.
5.4.4 Where the longitudinal stressed reinforcement adopts mechanical joints or
welded joints, the arrangement of joints shall meet the following requirements.
5.4.6 As for such members as beam and column, stirrups shall be configured within
the splicing length range of their longitudinal stressed reinforcement according to the
design requirements, which shall meet the following requirements.
5.4.7 The reinforcement binding shall meet the following requirements.
5.5 Quality Control
5.5.1 Site inspection of reinforcement shall meet the following requirements.
6 Prestressed Concrete
6.1 General Requirements
6.1.1 Special construction scheme shall be prepared for the prestressed concrete.
The in-depth design shall be carried out by the construction organization according to
the design documents, if necessary.
6.1.2 During the construction of prestressed concrete, necessary quality assurance
measures shall be taken according to the ambient temperature, which shall meet the
following requirements.
6.2 Materials
6.2.1 Performance of the prestressed tendons shall meet the requirements of the
current relevant standards of the Nation. Nominal diameter, nominal sectional area,
calculation sectional area and theoretical weight of common prestressed tendons
shall meet the requirements of Appendix B of this Code.
6.3 Fabrication and Installation
6.3.1 Fabrication length of prestressed tendon shall be determined through
calculation; the prestressed tendon shall be cut off by such mechanical methods as
abrasive cutoff saw or cut-off machine. During the fabrication or installation process,
the prestressed tendons shall not be used as earthing wires, which shall also be
prevented from being damaged by welding slag or earthing spark.
6.3.2 During the on-site handling and laying process of unbonded prestressed
tendons, their plastic sheathes shall not be damaged. In the case of slight damage,
the sheathes shall be timely sealed with waterproof tape; the tendons with badly
damaged sheathes shall not be used.
6.4.4 Post-tensioning control stress of prestressed tendon shall meet the
requirements of design and special construction scheme. Where over-post-tensioning
is required during construction, the adjusted post-tensioning control stress (σcon) shall
meet the following requirements.
6.4.6 Post-tensioning sequence of prestressed tendon shall meet the design
requirements as well as the following requirements.
6.5 Grouting and Anchorage Protection
6.5.1 In post-tensioning, the holes shall be grouted as early as possible after
post-tensioning the bonded prestressed tendon and passing the inspection; the
cement grout in holes shall be full and compact.
7 Concrete Production and Transportation
7.1 General Requirements
7.1.1 Premixed concrete should be used in concrete structure construction.
7.1.2 Production of concrete shall meet the following requirements.
7.2 Materials
7.2.1 The key technical indexes of the materials for concrete shall meet the
requirements of Appendix F in this Code as well as current relevant standards of the
Nation.
7.2.4 Fine aggregate should adopt natural sand or manufactured sand with good
gradation, hard character and clean particle, and it shall meet the following
requirements.
7.2.7 Mineral admixtures shall be selected according to the design and construction
requirements, and the environment conditions of the engineering location, and its
dosage shall be determined by test.
7.2.8 Additives shall be selected by test according to the design and construction
requirements, the properties of materials for concrete and the environment conditions
of the engineering location, and they shall meet the following requirements.
7.3 Mix Proportioning
7.3.1 The design mix proportion of concrete shall be determined by test, and meet the
following requirements.
8 Cast-in-situ Concrete
8.1 General Requirements
8.1.1 The following works shall be completed before placing of concrete.
8.1.2 The temperature of casting concrete mixture shall not be lower than 5°C and it
shall not be higher 35°C.
8.2 Conveying
8.2.1 Concrete conveying should adopt pumping mode.
8.2.3 Setting of concrete pump pipe and support shall meet the following
requirements.
8.2.4 The setting of concrete conveying feeding equipment shall meet the following
requirements.
8.2.5 Pipe, vessel and down-spouting for concrete conveying shall not absorb water
and leak slurry, and they shall guarantee smooth conveying. Thermal insulation, heat
insulation and rain-proof measures shall be applied for conveying concrete according
to environment conditions.
8.2.7 Conveying concrete with hoisting bucket vessel shall meet the following
requirements.
8.3 Placing
8.3.1 Prior to concreting, sundries in formwork or on bedding shall be removed. Dry
foundation, cushion, formwork should be watered; when the environment temperature
is higher than 35 °C, metal formwork should be watered for cooling; after watering,
there shall be no left water.
9 Precast Concrete
9.1 General Requirements
9.1.1 A special construction scheme shall be prepared for precast concrete. If
necessary, the professional construction organization shall carry out a deepening
design according to the design document.
9.1.4 After inspection qualified, a reliable designation shall be provided on the precast
member. Throughout the construction of precast concrete, measures shall be taken to
prevent the precast member against damage or contamination.
9.1.5 If a special approved product is adopted during the construction of precast
concrete, the special approved product and construction practice shall meet the
requirements of the current relevant national standards and product application
technology manual.
9.2 Checking
9.2.1 Before the construction of precast concrete structure, necessary checking shall
be carried out in accordance with the design requirements and construction scheme.
9.2.3 The checking of precast member shall meet the design requirements. If there is
no specific design requirement, the following requirements should be complied with.
9.3 Production
9.3.1 The place for producing precast member shall be flat, smooth and solid and
shall take drainage measures. When a pedestal is adopted for producing precast
member, the pedestal surface shall be flat and smooth; the evenness of the surface
within the length of 2m shall not be larger than 2mm; and expansion joints shall be
provided in areas with large temperature variation.
9.4 Storage and Transportation
9.4.1 The bearing position for the storage and transportation of precast member shall
be determined through calculation.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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