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GB 55004-2021: Code for Construction of Steel-Concrete Composite Structures
GB 55004-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
Code for Construction of Steel-Concrete Composite
Structures
ISSUED ON: APRIL 09, 2021
IMPLEMENTED ON: JANUARY 01, 2022
Issued by: Ministry of Housing and Urban-Rural Development of the PRC;
State Administration for Market Regulation.
Table of Contents
Foreword ... 3
1 General ... 6
2 Basic Provisions ... 7
3 Materials ... 9
3.1 Steel and reinforcement ... 9
3.2 Concrete ... 10
3.3 Wood ... 10
3.4 Fibre reinforced composite materials ... 11
4 Design of Structure System ... 13
4.1 General rules ... 13
4.2 Building structure system ... 13
4.3 Bridge structure system... 15
5 Design of Composite Member... 17
5.1 General provisions ... 17
5.2 Steel-concrete composite beam ... 17
5.3 Steel-concrete composite slabs ... 18
5.4 Concrete-filled steel tube members... 19
5.5 Steel-reinforced concrete members ... 19
5.6 Steel-concrete composite shear wall... 19
5.7 Steel-concrete composite bridge deck system ... 20
5.8 Timber composite member ... 20
5.9 Composite members of composite material ... 21
6 Construction and Acceptance ... 23
6.1 Construction ... 23
6.2 Acceptance ... 23
7 Maintenance and Demolition ... 25
7.1 Maintenance ... 25
7.2 Demolition ... 26
1 General
1.0.1 This Code is formulated, aiming to ensure the quality and safety of composite
structure projects, promote the promotion and application of composite structures,
protect the ecological environment, ensure the safety of people's lives and property
and personal health, and improve the level of green development of composite
structure projects.
1.0.2 The composite structure projects must implement this Code.
1.0.3 Whether the technical methods and measures adopted in the project construction
meet the requirements of this Code shall be determined by the relevant responsible
entities. Among them, innovative technical methods and measures shall be
demonstrated and meet the relevant performance requirements in this Code.
2 Basic Provisions
2.0.1 The safety level of composite structures and members shall be no lower than
Class-II. When the safety level of the composite structure and the member is
inconsistent, it shall be clearly marked in the design document.
2.0.2 The design working life of the composite structure shall meet the following
requirements:
1 The structure of the building (structure) shall be no less than 50 years;
2 The bridge structure shall be no less than 30 years;
3 When the design working life of composite members and components is lower
than that of the structure, it shall be clearly indicated in the design documents;
and a replaceable connection structure shall be adopted.
2.0.3 Within the design working life, the performance of the composite structure shall
meet the following requirements:
1 Able to withstand the structural effects that may occur during normal use;
2 During the normal construction period or during the period when the combined
effect of the structure is not formed, it can withstand the possible load effect;
3 Able to meet the design and use requirements of composite structures and
members;
4 In the event of accidental effects such as explosions, impacts, and rare
earthquakes, the structure shall maintain overall stability;
5 In the event of a fire, the structure shall maintain sufficient bearing capacity and
overall stability within the specified time.
2.0.4 Within the design working life, measures shall be taken to ensure the safe use of
the composite structure and members, and shall meet the following requirements:
1 Without technical appraisal or design permission, the functions and conditions of
use specified in the design shall not be changed;
2 For matters that affect the safety and durability of the main structure, regular
inspection, testing and maintenance shall be carried out;
3 The members, nodes, supports, anchors, components, etc. shall be replaced in
time according to the design provisions
4 The anti-corrosion, fire-proof and other protective layers on the surface of the
3 Materials
3.1 Steel and reinforcement
3.1.1 The steel for composite structure shall meet the following requirements:
1 The steel shall have the qualified guarantee of tensile strength, yield strength,
elongation and carbon, sulfur and phosphorus content;
2 The steel used for the main structure shall have the qualified guarantee of carbon
equivalent and cold bending performance;
3 The welded structural steel that needs to check fatigue shall have the qualified
guarantee of impact toughness;
4 The design requires that the steel with the resistance to layered tearing in the
thickness direction shall have the qualified guarantee of the reduction of area;
5 The ratio of the measured value of the yield strength to the standard value of the
steel in the member or node part that undergoes plastic deformation under the
action of rare earthquakes shall be no greater than 1.35.
3.1.2 Reinforcing bars for composite structure shall meet the following requirements:
1 Reinforcing bars shall have qualified guarantee of tensile strength and yield
strength;
2 The longitudinally stressed reinforcing bars and their stirrups shall have qualified
guarantees of ductility and weldability.
3.1.3 When using the limit state design method based on probability theory, the
strength design value of steel and reinforcing bars shall be determined according to
the standard value of their strength and the material sub-coefficient;
The determination of the material sub-coefficient shall meet the following requirements:
1 For steels and reinforcing bars with reliability analysis conditions, the statistical
results of their material strength tests shall be used as the basis of statistical
analysis; and the target reliability indicators shall be determined by
comprehensive analysis.
2 Steels and reinforcing bars that do not yet have reliability analysis conditions or
apply new steel grades shall be determined based on actual project experience
or test results; and shall comply with the provisions of Table 3.1.3.
Table 3.1.3 – Material Sub-Coefficient of Steel and Reinforcing Bar
with the purpose and the working life of the structure; and shall meet the
requirements of environmental protection; and the glue material shall have a
qualified guarantee of the bonding ability.
3.3.2 The strength design value of the timber in the composite structure shall be
determined according to the standard value of its strength and the material sub-
coefficient; and shall meet the following requirements:
1 Pure wood shall be determined according to the classification of tree species and
its strength grade, material grade, etc.;
2 Glulam shall be determined according to the classification of symmetrical
heterogeneous combination, asymmetric heterogeneous combination,
equivalent combination, parallel to grain, perpendicular to grain, etc.;
3 The design value of wood strength shall be corrected according to the conditions
of use, design working life, member size, load type, etc.
3.4 Fibre reinforced composite materials
3.4.1 Fibre-reinforced composite materials for composite structures shall meet the
following requirements:
1 High-performance fibres such as carbon fibre, glass fibre, aramid and basalt fibre
shall be used; the glass fibre composite material shall use the alkali-free or alkali-
resistant glass fibre;
2 T...