CECS : 10499 Technical Specification for High Strength Concrete Structures CECS104:99
Some standard content:
Attachment_10499
CECS 104:99
China Association for Engineering Construction Standardization Standard
Technical Specification for
High-Strength Concrete Structures1999
China Association for Engineering Construction Standardization Standard
Technical Code for High-Strength Concrete Structures
CECS104:99
Editor: High-Strength and High-Performance Concrete Committee of China Civil Engineering SocietyApproving Unit: China Association for Engineering Construction StandardizationApproval Date: June 30, 1999
1999 Beijing
In order to make supporting regulations for the technical requirements for the design and construction of high-strength concrete structures to promote their further development, in accordance with the requirements of Document No. 31 of China Association for Engineering Construction Standardization (1996), the High-Strength and High-Performance Concrete Committee of China Civil Engineering Society organized Tsinghua University, China Academy of Building Research, Southeast University, Ministry of Railways Research Institute, China State Construction Engineering Corporation, Changhai Building Materials Engineering Company, Beijing Urban Construction Group Building Science Research Institute, Beijing Urban Construction Group General Public Component Factory, Beijing Architectural Design Institute and other units to jointly prepare this code. This code is based on the "Guidelines for Design and Construction of High-Strength Concrete Structures" HSCC93-1 and 2 compiled by the High-Strength and High-Performance Concrete Committee of the China Civil Engineering Society, and has been revised and supplemented. Two key scientific research projects jointly funded by the National Natural Science Foundation of China and the Ministry of Construction and other units have been of great help in the preparation of this code. This code was finalized after extensive consultation with experts and a review meeting. The "Technical Code for High-Strength Concrete Structures" is now approved, numbered CECS104:99, and recommended to engineering design and construction units for use. This code is interpreted by the Department of Civil Engineering of Tsinghua University (North Haidian District, Postal Code: 100084). If you find any need for modification and supplementation during the implementation of this code, please send your opinions and information to the interpretation unit in a timely manner for future revisions.
Editor-in-chief: High Strength and High Performance Concrete Committee of China Civil Engineering Society Main drafters: Chen Zhaoyuan, Cai Shaohuai, Zhu Jinquan, Zhuang Yaping, Qian Jiaru, Jiang Yongsheng, Ye Lieping, Wu Peigang, Zang Xuanwu, Feng Naiqian, Qin Weizu
China Association for Engineering Construction Standardization
June 1999
Main symbols
Calculation index of concrete structure materials
Basic design provisions for concrete structures
Ultimate state calculation of bearing capacity of concrete structures 5.1
Bearing capacity calculation of normal section·
Bearing capacity calculation of inclined section
Bearing capacity and shear bearing capacity calculation of twisted section 5.4
Bearing capacity calculation of local compressive load
Verification of limit state of normal serviceability of concrete structures Concrete structure structure?
Design of concrete structural members:
Seismic design of concrete structures·
Design and construction of concrete-filled steel tube columns
General provisions
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Bearing capacity calculation
Local compression calculation
Deformation calculation
Node construction
Construction quality requirements
Design of steel-reinforced concrete members
Concrete construction
Concrete raw materials
Concrete mix ratio
Concrete mixing
(2)
(42)
(45)
Appendix A
Appendix B
Appendix ℃
Appendix D
Concrete transportation and flow,Www.bzxZ.net
Concrete pumping construction
Concrete curing
Concrete quality inspection
(46)
(49)
Performance requirements and water requirement ratio test method for fly ash used in preparing high-strength concrete
Test method for compatibility of high-efficiency water reducer and cement Test method for workability of high-strength concrete
Terms used in this code
China Construction Information Network
1.0.1 This code is specially formulated to promote the application of modern high-strength concrete technology in my country and to achieve advanced technology, safety, reliability, economy and quality assurance in the design and construction of high-strength concrete structures.
1.0.2 This code is applicable to the design and construction of reinforced concrete and prestressed concrete load-bearing structures using high-strength concrete in industrial and civil buildings and general structures. Among them, high-strength concrete is C50-C80 grade concrete prepared by conventional process using cement sand, stone, high-efficiency water reducing agent and other admixtures and fly ash, ultrafine slag, silica fume and other mineral admixtures.
1.0.3 The structural design part of this code is formulated according to the principles of the national standard "Uniform Standard for Building Structure Design" GBJ68-84; the symbols and terms are based on the provisions of the national standard "Standard for Terms and Symbols for Building Structure Design" GB/T50083-97. 1.0.4 In addition to the provisions of this code, when designing high-strength concrete structures, other provisions of the "Concrete Structure Design Code" GBJ10-89 must be followed; when designing high-strength concrete structures in seismic areas, other provisions of the "Building Seismic Design Code" GBJ11-89 must be followed; when designing steel tube high-strength concrete columns, other provisions of the "Steel Tube Concrete Structure Design and Construction Code" CECS28:90 must be followed; when designing steel-framed high-strength concrete components, other provisions of the "Steel Frame Concrete Structure Design Code" YB9082-97 must be followed.
1.0.5 In addition to the provisions of this code, when constructing high-strength concrete structures, the current national standard "Concrete Structure Engineering Construction and Acceptance Code" GB50204-92 shall also be followed.
Concrete Structure
2 Main symbols
elastic modulus of concrete;
feu,10
fek, f
fk, f
foy, fy'
elastic modulus of steel bars;
indicates the concrete strength grade with a standard value of cube compressive strength of 60N/mm2;
compressive strength of concrete with a side length of 150mm; compressive strength of concrete with a side length of 100mm; standard value and design value of axial compressive strength of concrete; Standard value and design value of axial tensile strength of concrete: Design value of tensile and compressive strength of ordinary steel bars: Design value of tensile and compressive strength of pre-edged steel bars; The resultant force of prestressed steel bars and non-prestressed steel bars when the normal prestress of concrete is equal to zero;
Design value of shear force:
Design value of shear bearing capacity of concrete and stirrups on the inclined section of the component: Longitudinal tensile steel bar stress calculated according to the combination of short-term effects of loads or, equivalent stress:
Prestressed steel bars when the normal stress of concrete at the resultant point of prestressed steel bars is equal to zero Reinforcement stress;
Maximum crack width considering the combined influence of uneven crack width distribution and long-term load effect:
Rectangular section width, web width of T-shaped and I-shaped sections; Reinforcement diameter;
Concrete cover thickness;
Eccentricity of axial force to the center of gravity of the section:
Section height;
A, A
Asy, Ash
Effective height of the section,
Spacing of transverse reinforcement along the axis of the member:
Height of concrete compression zone;
Cross-sectional area of longitudinal non-prestressed steel bars in tension zone and compression zone; total cross-sectional area of vertical and horizontal stirrups of each limb in the same section; local compression area of concrete;
Coefficient related to calculated height of concrete in compression zone; influence coefficient of plasticity of concrete in tension zone;
Shear span ratio of calculated section
Reinforcement ratio of longitudinal tension steel bars;
Coefficient considering influence of long-term load combination on deflection increase: strain non-uniformity coefficient of longitudinal tension steel bars between cracks. Concrete-filled steel tube column
Cross-sectional area of steel tube;
Cross-sectional area of concrete in steel tube;
Local compression area;
Outer diameter of steel tube;
Elastic modulus of steel material;
Eccentricity of axial pressure at the larger moment end of column to the centroidal axis of column section or pressure centroidal axis;
Yield strength of steel material;
Length of concrete-filled steel tube column or member;
Equivalent calculation length of concrete-filled steel tube column or member; Design value of axial force;
Design value of bearing capacity of axially compressed short column of concrete-filled steel tube: Design value of axial compressive bearing capacity of member: Inner radius of steel tube;
Wall thickness of steel tube;
Hoop index of concrete-filled steel tube.
Calculation index of concrete structure material
Standard value of high-strength concrete strength shall be adopted according to the provisions of Table 3C0.1. Table 3.0.1
Strength type
Axial compression
Standard value of high-strength concrete strength (N/mm2)Strength
The design value of high-strength concrete strength shall be adopted according to the provisions of Table 3.0.2. The design value of flexural strength of high-strength concrete shall be equal to the design value of axial compressive strength. Table 3.0.2
Strength axial type
Auxiliary compression
Note: 1
Design value of high-strength concrete strength (N/mm2)Strength
When calculating the axial compression and eccentric compression members of cast-in-place reinforced concrete, if the long side or diameter of the section is less than 300mm, the strength design value in the table shall be multiplied by a coefficient of 0.8. The strength design value of centrifugal concrete shall be specified separately. The elastic modulus E of high-strength concrete when subjected to compression or tension. It shall be adopted according to the provisions of Table 3.0.3.
Strength grade
Elastic modulus
Note: 1 The elastic modulus of high-strength concrete is related to the type of coarse aggregate, sand ratio and air entraining agent used: for important projects, it should be taken as 0.95 times the measured average value. 2 For pumped concrete with air entraining agent and high sand ratio, when there is no measured data, the E value in the table should be multiplied by the reduction factor 0.900.95. 3
The values in the table are not applicable to self-compacting concrete and concrete with a sand ratio greater than 0.44. 3.0.4 The fatigue strength design value of high-strength concrete should be determined by multiplying the specified value in Table 3.0.2 by the fatigue strength correction factor. It can be adopted according to the provisions of "Concrete Structure Design Code" GBJ 10-89. For components that are often exposed to moisture, it should be multiplied by the reduction factor 0.8. The fatigue deformation modulus E of high-strength concrete should be adopted as Q.47 times the specified value of the elastic modulus E in Table 3.0.3.
3.0.5 The shear modulus Gc of high-strength concrete can be adopted according to 0.4 times the value specified in the elastic modulus E in Table 3.0.3. The linear expansion coefficient and Poisson's ratio of high-strength concrete can be adopted according to the provisions of the "Concrete Structure Design Code" GBJ10-89. 3.0.6 High-strength concrete reinforcement should use higher strength grades of reinforcement, and prestressed reinforcement should preferably use high-strength carbon steel wire, notched steel wire, steel strand and heat-treated reinforcement: non-prestressed force-bearing reinforcement should use Grade II to IV reinforcement. The strength and elastic modulus design values of reinforcement should be adopted according to the provisions of the "Concrete Structure Design Code" GBJ10-89. 4 Basic design regulations for concrete structures
4.0.1 The basic design regulations for high-strength concrete structures shall be implemented in accordance with the provisions of Chapter 3 of the "Concrete Structure Design Code" GBJ 10-89. High-strength concrete load-bearing structures must be equipped with reinforcement. For beams and column components in important projects, their key load-bearing parts should be designed as confined concrete. In the case of high-strength concrete beams and columns, the favorable factor of smaller concrete creep can be considered.
4.0.2 The internal force calculation of high-strength concrete over-static structural members can consider the redistribution of plastic internal forces caused by inelastic deformation according to the provisions of CECS51:93 of the "Design Code for Reinforced Concrete Continuous Beams and Frames Considering Internal Reinforcement Distribution", but the upper limit of the relative calculation height of the concrete in the compression zone on the maximum moment section should be taken as β/0.8, and the β value should be determined according to Table 5.1.1.
4.0.3 When prestressing, under the condition of meeting the strength requirements for local pressure cracking in the anchorage area, the calculated concrete cube compressive strength can be lower than 5% of the concrete strength design value, but should not be lower than 70%.
4.0.4 When the prestress loss of prestressed components caused by concrete shrinkage and creep is calculated according to the formula listed in Article 3.4.11 of the Code for Design of Concrete Structures GBJ10-89, the constant 220 in the formula can be multiplied by the reduction factor
(when the value is greater than 1, it is taken as 1). f. is the design value of concrete compressive strength, which shall be adopted according to the provisions of Table 3.0.2.
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