1 General
1.0.1 This specification is established to standardize and guide the design of highway assembled concrete bridges, to promote the industrialization of bridges and to enhance the quality of bridge projects.
1.0.2 This specification applies to the design of highway assembled concrete girder bridges.
1.0.3 The design of highway assembled concrete bridges shall follow the principles of safety, durability, applicability, environmental protection, economy and aesthetics, taking into account prefabrication, transportation, installation and other construction factors.
1.0.4 The design of highway assembled concrete bridges shall conform to the provisions of this specification, in addition to the provisions of the relevant national and industry standards in force.
2 Terminology and symbols
2.1 Terminology
2.1.1 assembled concrete bridge precastconcretebridge
A concrete bridge consisting of prefabricated concrete elements combined in a reliable manner to form a whole.
2.1.2 glue jointepoxyjoint
A joint in which the joint surfaces of precast sections of concrete elements are coated with an epoxy-based resin material.
2.1.3 Mortar-filled joint mortarjoint
A joint in which the joint surface of precast concrete sections is filled with cement-based mortar and then compacted.
2.1.4 cast-in-placeconcretejoint
A joint between prefabricated sections of concrete elements connected by cast-in-place concrete, also known as a wet joint.
3 Basic provisions
3.1 General provisions
3.1.1 Roadway assembled concrete bridges shall be designed using the limit state of load carrying capacity and normal service limit state design method based on probability theory and expressed in terms of sub-factors.
3.1.2 The prefabricated components of bridges shall be designed in blocks taking into account the requirements of the overall load bearing characteristics of the structure and the conditions of transport and installation. The joints shall be of clear force and reliable construction.
Article description
The design of precast bridge components in blocks determines the size of the components, the position of the connection section and other key factors, which have a certain influence on the load bearing properties of the structure, the overall load bearing capacity and the cost of the project. The joint section is the weak link of the assembled concrete structure and the key point of design. The main design concept is to choose safe and reliable connection technology, and to combine the assembled components into a whole through reasonable connection node construction measures to ensure that they have basically the same load-bearing capacity, integrity, ductility and durability as the cast-in-place concrete structure, and to achieve the same use function as the cast-in-place concrete structure. 3.2 Role and the combination of action effects
3.2.1 The classification of the action, the representative value, the combination of action and the value of the structural importance factor shall be in accordance with the current "General Specification for Highway Bridge Design" (JTGD60).
3.2.2 prefabricated components in lifting, transport and other transient conditions of the construction of the verification, the gravity of the components shall be multiplied by the power coefficient. The power factor shall be adopted in accordance with the provisions of the current General Specification for the Design of Highway Bridges and Culverts (JTGD60). The design of lifting points may be carried out in accordance with Appendix A of this specification.
3.3 Design requirements
3.3.1 The design of assembled concrete bridges shall comply with the provisions of the current Code of Practice for the Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts (JTG3362).
3.3.2 The splice joints of precast piers of assembled concrete bridges shall not be set in the water level change area and wave splash area. 3.3.3 The durability design of the in-body prestressing system shall meet the following requirements:
1 In vitro prestressing reinforcement may be epoxy-coated strand, unbonded strand or finished strand ropes, etc., according to environmental conditions.
4 Materials
4.1 Concrete, reinforcement and steel
4.1.1 The design specifications of concrete, common reinforcement, prestressing steel and steel shall comply with the current "Design Code for Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts" (JTG3362) and "Design Code for Highway Steel Bridges" (JTGD64).
4.1.2 The concrete strength grade of reinforced concrete precast members shall not be lower than C30; the concrete strength grade of prestressed concrete precast members shall not be lower than C40; the concrete strength grade of wet joints shall not be lower than the concrete strength grade of precast members.
4.1.3 Hot-rolled ribbed steel bars shall be used for ordinary reinforcement when connected by grouting sleeves and grouted corrugated steel pipes. 4.2 Connection materials
4.2.1 Grouted connection sleeves may be cast grouted sleeves or machined grouted sleeves according to the processing method, and may be made into full grouted sleeves or half grouted sleeves according to the reinforcement connection method.
Article description:
Grouted connection sleeves are now a more commonly used connection method for prefabricated assembled substructures, which serve to transfer the force from one bar to another. The full grouting sleeve has a prefabricated installation end at one end and a field assembled end at the other end. The sleeve has a reinforcement limit stop in the middle, a pressure port at the lower end of the sleeve and a grout outlet at the upper end of the sleeve. The semi-grouted sleeve has a prefabricated installation end and a field assembled end, with a pressure port at the lower end of the sleeve and a grout outlet at the upper end.
5 Superstructure
5.1 General provisions
5.1.1 The superstructure of assembled concrete bridges may be prefabricated in transverse sections or longitudinal sections, and a standard span arrangement is desirable. Commonly used section types and standard span diameters can be adopted in accordance with Table 5.1.1.
5.2 Structural provisions
5.2.1 The superstructure of transversely segmented assembled concrete bridges shall meet the provisions of this section in addition to the current Code of Practice for the Design of Reinforced Concrete and Prestressed Concrete Bridges and Culverts for Highways (JTG3362).
5.2.2 simply supported system bridge deck longitudinal continuous cast-in-place layer should be set at the centre of the pier cut joints, bridge deck continuous section cast-in-place layer and precast girders can be set between the thickness of not less than 2mm isolation layer. Bridge deck longitudinal continuous transmission reinforcement in the top of the pier at the length of the unbonded section should not be less than 1m, and should be waterproof measures.
5.2.3 In the continuous section at the top of the pier of the first simply-supported and then continuous structural system, the precast girders should be reserved for longitudinal reinforcement at the end of the girders, and the end surfaces of the precast girders should be made into a rough surface with a convexity of not less than 6 mm.
6 Sub-structure
6.1 General provisions
6.1.1 The connection of precast sections of assembled concrete piers may be determined according to the structural form, construction conditions and other factors in accordance with Table 6.1.1.
7 Seismic design
7.1 General provisions
7.1.1 This chapter applies to the seismic design of assembled concrete bridges in areas with a basic peak ground acceleration of 0.1g and below. Where the peak acceleration of the fundamental ground shaking is 0.1g or more, seismic isolation measures shall be used.
Article description
Research on the seismic performance of precast bridge piers with different joint types, applied axial pressure ratios, pre-loaded axial pressure ratios and energy-consuming reinforcement amounts is mainly focused on areas with a peak fundamental ground vibration acceleration of 0.1g and below, with less research in medium and high intensity zones.
The seismic isolation design utilises seismic isolation devices installed on the bridge to reduce the structural seismic response by increasing the damping and/or period of the structural system to achieve the desired seismic protection requirements. For assembled bridges in areas where the fundamental peak ground vibration acceleration is 0.1g or above, when the traditional ductile design is difficult to meet the seismic requirements, it is recommended that a vibration damping system be installed between the bridge superstructure and substructure to reduce the seismic response of the structure.
7.1.2 The substructure system and joint selection for assembled concrete bridges shall meet the requirements for seismic protection. Article description
The seismic performance of assembled piers formed by different connection methods varies, and the selection of substructure systems and joints should be determined in conjunction with the seismic protection requirements.
Appendix A Suspension point design
Appendix B Material properties of activated powder concrete
1 General
2 Terminology and symbols
3 Basic provisions
4 Materials
5 Superstructure
6 Sub-structure
7 Seismic design
Appendix A Suspension point design
Appendix B Material properties of activated powder concrete
Standard
JTG/T 3365-05-2022 Specifications for Design of Highway Precast Concrete Bridges (English Version)
Standard No.
JTG/T 3365-05-2022
Status
valid
Language
English
File Format
PDF
Word Count
43000 words
Price(USD)
1290.0
Implemented on
2022-8-1
Delivery
via email in 1~5 business day
Detail of JTG/T 3365-05-2022
Standard No.
JTG/T 3365-05-2022
English Name
Specifications for Design of Highway Precast Concrete Bridges
1 General
1.0.1 This specification is established to standardize and guide the design of highway assembled concrete bridges, to promote the industrialization of bridges and to enhance the quality of bridge projects.
1.0.2 This specification applies to the design of highway assembled concrete girder bridges.
1.0.3 The design of highway assembled concrete bridges shall follow the principles of safety, durability, applicability, environmental protection, economy and aesthetics, taking into account prefabrication, transportation, installation and other construction factors.
1.0.4 The design of highway assembled concrete bridges shall conform to the provisions of this specification, in addition to the provisions of the relevant national and industry standards in force.
2 Terminology and symbols
2.1 Terminology
2.1.1 assembled concrete bridge precastconcretebridge
A concrete bridge consisting of prefabricated concrete elements combined in a reliable manner to form a whole.
2.1.2 glue jointepoxyjoint
A joint in which the joint surfaces of precast sections of concrete elements are coated with an epoxy-based resin material.
2.1.3 Mortar-filled joint mortarjoint
A joint in which the joint surface of precast concrete sections is filled with cement-based mortar and then compacted.
2.1.4 cast-in-placeconcretejoint
A joint between prefabricated sections of concrete elements connected by cast-in-place concrete, also known as a wet joint.
3 Basic provisions
3.1 General provisions
3.1.1 Roadway assembled concrete bridges shall be designed using the limit state of load carrying capacity and normal service limit state design method based on probability theory and expressed in terms of sub-factors.
3.1.2 The prefabricated components of bridges shall be designed in blocks taking into account the requirements of the overall load bearing characteristics of the structure and the conditions of transport and installation. The joints shall be of clear force and reliable construction.
Article description
The design of precast bridge components in blocks determines the size of the components, the position of the connection section and other key factors, which have a certain influence on the load bearing properties of the structure, the overall load bearing capacity and the cost of the project. The joint section is the weak link of the assembled concrete structure and the key point of design. The main design concept is to choose safe and reliable connection technology, and to combine the assembled components into a whole through reasonable connection node construction measures to ensure that they have basically the same load-bearing capacity, integrity, ductility and durability as the cast-in-place concrete structure, and to achieve the same use function as the cast-in-place concrete structure. 3.2 Role and the combination of action effects
3.2.1 The classification of the action, the representative value, the combination of action and the value of the structural importance factor shall be in accordance with the current "General Specification for Highway Bridge Design" (JTGD60).
3.2.2 prefabricated components in lifting, transport and other transient conditions of the construction of the verification, the gravity of the components shall be multiplied by the power coefficient. The power factor shall be adopted in accordance with the provisions of the current General Specification for the Design of Highway Bridges and Culverts (JTGD60). The design of lifting points may be carried out in accordance with Appendix A of this specification.
3.3 Design requirements
3.3.1 The design of assembled concrete bridges shall comply with the provisions of the current Code of Practice for the Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts (JTG3362).
3.3.2 The splice joints of precast piers of assembled concrete bridges shall not be set in the water level change area and wave splash area. 3.3.3 The durability design of the in-body prestressing system shall meet the following requirements:
1 In vitro prestressing reinforcement may be epoxy-coated strand, unbonded strand or finished strand ropes, etc., according to environmental conditions.
4 Materials
4.1 Concrete, reinforcement and steel
4.1.1 The design specifications of concrete, common reinforcement, prestressing steel and steel shall comply with the current "Design Code for Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts" (JTG3362) and "Design Code for Highway Steel Bridges" (JTGD64).
4.1.2 The concrete strength grade of reinforced concrete precast members shall not be lower than C30; the concrete strength grade of prestressed concrete precast members shall not be lower than C40; the concrete strength grade of wet joints shall not be lower than the concrete strength grade of precast members.
4.1.3 Hot-rolled ribbed steel bars shall be used for ordinary reinforcement when connected by grouting sleeves and grouted corrugated steel pipes. 4.2 Connection materials
4.2.1 Grouted connection sleeves may be cast grouted sleeves or machined grouted sleeves according to the processing method, and may be made into full grouted sleeves or half grouted sleeves according to the reinforcement connection method.
Article description:
Grouted connection sleeves are now a more commonly used connection method for prefabricated assembled substructures, which serve to transfer the force from one bar to another. The full grouting sleeve has a prefabricated installation end at one end and a field assembled end at the other end. The sleeve has a reinforcement limit stop in the middle, a pressure port at the lower end of the sleeve and a grout outlet at the upper end of the sleeve. The semi-grouted sleeve has a prefabricated installation end and a field assembled end, with a pressure port at the lower end of the sleeve and a grout outlet at the upper end.
5 Superstructure
5.1 General provisions
5.1.1 The superstructure of assembled concrete bridges may be prefabricated in transverse sections or longitudinal sections, and a standard span arrangement is desirable. Commonly used section types and standard span diameters can be adopted in accordance with Table 5.1.1.
5.2 Structural provisions
5.2.1 The superstructure of transversely segmented assembled concrete bridges shall meet the provisions of this section in addition to the current Code of Practice for the Design of Reinforced Concrete and Prestressed Concrete Bridges and Culverts for Highways (JTG3362).
5.2.2 simply supported system bridge deck longitudinal continuous cast-in-place layer should be set at the centre of the pier cut joints, bridge deck continuous section cast-in-place layer and precast girders can be set between the thickness of not less than 2mm isolation layer. Bridge deck longitudinal continuous transmission reinforcement in the top of the pier at the length of the unbonded section should not be less than 1m, and should be waterproof measures.
5.2.3 In the continuous section at the top of the pier of the first simply-supported and then continuous structural system, the precast girders should be reserved for longitudinal reinforcement at the end of the girders, and the end surfaces of the precast girders should be made into a rough surface with a convexity of not less than 6 mm.
6 Sub-structure
6.1 General provisions
6.1.1 The connection of precast sections of assembled concrete piers may be determined according to the structural form, construction conditions and other factors in accordance with Table 6.1.1.
7 Seismic design
7.1 General provisions
7.1.1 This chapter applies to the seismic design of assembled concrete bridges in areas with a basic peak ground acceleration of 0.1g and below. Where the peak acceleration of the fundamental ground shaking is 0.1g or more, seismic isolation measures shall be used.
Article description
Research on the seismic performance of precast bridge piers with different joint types, applied axial pressure ratios, pre-loaded axial pressure ratios and energy-consuming reinforcement amounts is mainly focused on areas with a peak fundamental ground vibration acceleration of 0.1g and below, with less research in medium and high intensity zones.
The seismic isolation design utilises seismic isolation devices installed on the bridge to reduce the structural seismic response by increasing the damping and/or period of the structural system to achieve the desired seismic protection requirements. For assembled bridges in areas where the fundamental peak ground vibration acceleration is 0.1g or above, when the traditional ductile design is difficult to meet the seismic requirements, it is recommended that a vibration damping system be installed between the bridge superstructure and substructure to reduce the seismic response of the structure.
7.1.2 The substructure system and joint selection for assembled concrete bridges shall meet the requirements for seismic protection. Article description
The seismic performance of assembled piers formed by different connection methods varies, and the selection of substructure systems and joints should be determined in conjunction with the seismic protection requirements.
Appendix A Suspension point design
Appendix B Material properties of activated powder concrete
Contents of JTG/T 3365-05-2022
1 General
2 Terminology and symbols
3 Basic provisions
4 Materials
5 Superstructure
6 Sub-structure
7 Seismic design
Appendix A Suspension point design
Appendix B Material properties of activated powder concrete
