1 General provisions
1.0.1 In order to achieve safety, serviceability, advanced technology, economy efficiency and easy construction in the design of tall building concrete structures, including the mixed structure of steel and concrete, in Guangdong Province, this specification is formulated based on the design experience and engineering practice in the province.
1.0.2 This specification is applicable to residential buildings with 10 and more stories or with a height larger than 28m, and other civil building concrete structures with a height larger than 24m. This specification does not apply to tall buildings in areas susceptible to hazards such as landslides, subsidences, and dam failure during earthquakes.
1.0.3 Buildings in the areas with a seismic fortification intensity of 6 degrees or above shall be subjected to seismic design. The seismic fortification intensity of tall buildings shall be determined in accordance with the documents issued by the state designated authority. In general, the basic seismic intensity of China's ground motion parameter zoning map is adopted. The seismic fortification level may be raised if specially required by the employer, but shall not be reduced.
1.0.4 Tall buildings in seismic design are divided into three seismic fortification categories: A, B and C.
Category A buildings are major construction works and buildings that may lead to serious secondary disasters during earthquakes. Category B buildings are buildings the functions of which shall not be interrupted during an earthquake or should to be restored as soon as possible. Category C buildings are general tall buildings other than Category A and Category B. The classification of seismic fortification categories shall comply with the relevant provisions of the current national standard GB 50223 Standard for classification of seismic protection of building constructions and GB 50011 Code for seismic design of buildings.
Note: Categories A, B, and C buildings in this specification respectively refer to the special fortification category, key fortification category, and standard fortification category specified in the current standard GB 50223 Standard for classification of seismic protection of building constructions.
1.0.5 Tall building structure shall emphasize conceptual design, highlight the selection of structure type and the regularity of plan and elevation layouts, strengthen the structural measures, and select economic effective structural system with optimal seismic and wind resistance.
1.0.6 When the concrete structure of tall building in seismic design exceeds the applicable scope of this specification or has particularly irregular plan and elevation layouts leading to special requirements for the seismic performance, performance-based seismic design of structures may be used for supplementary analysis and demonstration.
1.0.7 In order to improve the seismic safety and use comfortableness of tall buildings, seismic isolation and energy dissipation design may be adopted.
1.0.8 In addition to this specification, the design and construction of tall building concrete structures shall also comply with the compulsory provisions given in the relevant current national standards.
2 Terms and symbols
2.1 Terms
2.1.1 tall building, high-rise building
residential buildings with 10 stories or more or with a building height greater than 28m and other high-rise civil buildings with a building height larger than 24m
2.1.2 building height
height from the outdoor ground to the main roof of the building, excluding the height of, among others, the elevator room, water tank, and frame that protrudes from the roof
2.1.3 frame structure
structure that is composed of beams and columns as main components and bears vertical and horizontal actions
2.1.4 shearwall structure
structure composed of shear walls that bears vertical and horizontal actions
2.1.5 frame-shearwall structure
structure in which the frame and the shear wall jointly bear the vertical and horizontal actions
2.1.6 slab-column-shearwall structure
structure in which slab-column frame composed of beamless slabs and columns, together with shear wall,bears vertical and horizontal actions
2.1.7 tube structure
tall building structure that is composed mainly of a tube, which may be classified into thin-walled tube with shear walls on the periphery, frame tube with dense column frame or wall frame on the periphery, and oblique grid tube composed of oblique cross members, and bears vertical and horizontal actions
2.1.8 frame-corewall structure
tall building structure composed of a core tube and a sparse column frame on the periphery
2.1.9 tube in tube structure
tall building structure composed of a core tube and an outer frame tube, oblique grid tube, among others
2.1.10 mixed structure, hybrid structure
structure that is composed of a steel frame (frame tube), section steel concrete frame (frame tube), steel tube concrete frame (frame tube) and a reinforced concrete core tube which jointly bear horizontal and vertical actions
2.1.11 structural transfer member
structural member, including transfer beams, transfer trusses, transfer plates, etc., set to complete the structural transformation from the upper story to the lower story or change in the structural arrangement from the upper story to the lower story, with the transfer beams of partial frame-supported shearwall structures also called “frame-supported beams”
2.1.12 transfer story
story where the structural transfer members are located, including the horizontal structural member and the vertical structural member thereunder
2.1.13 story with outriggers and/or belt members
story with a horizontal outrigger (beam or truss) structure that connects the inner tube and the peripheral structure, along the peripheral structure of which a horizontal beam belt or truss may be set if necessary
2.1.14 towers linked with connective structure(s)
structure with a connecting body (including a corridor) between two or more towers, except podium
2.1.15 multi-tower structure with a common podium
structure in which the upper part of the podium above the ground that is not separated by structural joints has two or more towers
2.1.16 performance-based seismic design of structures
seismic design of structures based on structural seismic performance objectives
2.1.17 structural seismic performance objectives
structural seismic performance levels set with respect to the actions of small, medium, and large earthquakes
2.1.18 structural seismic performance levels
definition of seismic performance of structures, such as damage and possibility of continued use after the earthquake
2.1.19 isolation structure
structural system formed by installing seismic isolation devices in the building structure, including the superstructure, seismic isolation layer, substructure and foundation
2.1.20 energy dissipation structure
structure with energy dissipater, including the main structure and energy dissipation component
2.2 Symbols
2.2.1 Mechanical properties and resistance of materials
C20——the concrete strength grade with the characteristic cube strength of 20N/mm2;
Ee——the elastic modulus of concrete;
Es——the elastic modulus of rebar;
fek, fe——respectively the characteristic value and design value of concrete axial compressive strength;
ftk, ft——respectively the characteristic value and design value of concrete axial tensile strength;
fyk——the characteristic strength of ordinary rebar;
fy, ——the design values of respectively tensile and compressive strength of ordinary rebar;
fyv——the design value of tensile strength of beam and column stirrup;
fyh,fyw——the design values of the tensile strength of respectively the horizontally and vertically distributed rebars of shearwall;
Kh——the horizontal equivalent stiffness of isolation layer;
Ki——the lateral stiffness of the i-th story of the structure;
Ra——the characteristic value of the vertical bearing capacity of a single pile;
Rd——the design bearing capacity of member.
2.2.2 Actions and effects
FEk——the characteristic value of total horizontal seismic action of structure;
FEvk——the characteristic value of total vertical seismic action of the structure;
GE——the representative value of total gravity load of the structure for seismic action calculation;
Geq——the representative value of equivalent total gravity load of the structure;
M——the design value of bending moment;
N——the design value of axial force;
Qk——the characteristic value of the vertical force of a single pile;
Sd——the design value of the load effect or the combination of the load effect and the seismic effect;
SGk——the characteristic value of permanent load effect;
SQk——the characteristic value of the floor live load effect;
SWk——the characteristic value of wind load effect;
SEhk——the effect of the characteristic horizontal seismic action;
SEvk——the effect of the characteristic vertical seismic action;
V——the design value of shear force;
w0——the reference wind pressure;
w10——the wind pressure with a return period of 10 years;
wk——the characteristic value of wind load;
Fn——the characteristic value of the additional horizontal seismic action at the structure top;
u——the lateral displacement of story;
u——the story drift;
θi——the story drift angle of the i-th story of the structure;
θE——the elastic story drift angle of structure;
θP——the elasto-plastic story drift angle of structure.
Foreword ii
1 General provisions
2 Terms and symbols
2.1 Terms
2.2 Symbols
3 Basic requirements of structural design
3.1 General requirement
3.2 Materials
3.3 Height and aspect ratio limitations
3.4 Structural plan layout
3.5 Structural vertical arrangement
3.6 Diaphragm system
3.7 Limitations for story drift and comfort
3.8 Strength design of members
3.9 Seismic design grade of structural members
3.10 Requirement for members of special seismic design grade
3.11 Performance-based seismic design of structures
3.12 Requirement for preventing structural progressive collapse
4 Loads and seismic actions
4.1 Vertical load
4.2 Wind load
4.3 Seismic action
5 Structural analysis
5.1 General requirement
5.2 Analysis parameters
5.3 Analysis modeling
5.4 Second-order effects and structural stability
5.5 Elastio-plastic analysis and check of story drift of weak and/or soft stories
5.6 Effects of combinations of loads and/or seismic actions
6 Design of frame structure
6.1 General requirement
6.2 Strength design
6.3 Requirement for detailing of frame beams
6.4 Requirement for detailing of frame columns
6.5 Requirement for splices and anchorage of rebar
7 Design of shearwall structure
7.1 General requirement
7.2 Strength design and detailing
8 Design of frame-shearwall structure
8.1 General requirements
8.2 Strength design and detailing
9 Design of tube structure
9.1 General requirements
9.2 Frame-corewall structure
9.3 Tube in tube structure
10 Mega-frame-core tube structure
10.1 General requirements
10.2 Strength design and detailing
11 Design of complex tall buildings
11.1 General requirements
11.2 Structure with transfer story
11.3 Structure with outriggers and/or belt members
11.4 Structure with staggered stories
11.5 Towers linked with connective structure
11.6 Structure with setback and/or cantilever
12 Design of mixed structures
12.1 General requirements
12.2 Structural layout and arrangement
12.3 Structural analysis
12.4 Design of structural members
13 Design of basement and foundation
13.1 General requirement
13.2 Design of basement
13.3 Design of foundation
13.4 Requirement for detailing of pile
14 Design of isolation and energy dissipation structure
14.1 General requirement
14.2 Design of isolation structure
14.3 Energy dissipation structure
14.4 Wind vibration control structure
15 Construction of tall building
15.1 General requirement
15.2 Surveying
15.3 Foundation
15.4 Vertical transportation
15.5 Scaffold and falsework
15.6 Formworks
15.7 Steel reinforcement
15.8 Concrete
15.9 Massive concrete
15.10 Mixed structures
15.11 Complex concrete structures
15.12 Construction safety
15.13 Construction in hot weather and rainy weather
15.14 Green construction
Annex A Calculation of vertical vibration acceleration of diaphragm structure
Annex B Reference wind pressure and wind shape factor in Guangdong Province
Annex C Time-domain explicit random simulation method
Annex D Check of stability of structural wall
Annex E Lateral stiffness requirements for stories adjacent to transfer story
Annex F Design of circular steel tube reinforced concrete column
Annex G Design method of bearing capacity of ring beam at the joint of RC beam and circular steel tube reinforced concrete column
Explanation of wording in the specification
List of quoted standards
