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GB 55002-2021: Code for seismic design of buildings Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
GB 55002-2021: Code for seismic design of buildings---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/GB55002-2021GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA UDC P GB 55002-2021 General code for seismic precaution of buildings and municipal engineering Issued on. APRIL 09, 2021 Implemented on. JANUARY 01, 2022 Issued by. Ministry of Housing and Urban-Rural Development of PRC; State Administration for Market Regulation. Table of ContentsForeword... 3 1 General... 6 2 Basic provisions... 6 2.1 Performance requirements... 6 2.2 Earthquake effects... 7 2.3 Seismic fortification classification and fortification criteria... 8 2.4 Engineering seismic system... 10 3 Seismic requirements of site and foundation... 11 3.1 Site seismic survey... 11 3.2 Earthquake resistance of base and foundation... 13 4 Seismic action and structural seismic verification... 14 4.1 General provisions... 14 4.2 Seismic action... 15 4.3 Seismic check... 18 5 Seismic measures for construction projects... 21 5.1 General provisions... 21 5.2 Concrete structure houses... 25 5.3 Steel structure house... 27 5.4 Steel-concrete composite structure house... 28 5.5 Masonry structure houses... 30 5.6 Wooden houses... 35 5.7 Earth and stone structure houses... 36 5.8 Mixed load-bearing structures... 38 6 Anti-seismic measures for municipal engineering... 40 6.1 Urban bridge... 40 6.2 Urban rural water supply & drainage and gas thermal engineering... 43 6.3 Underground engineering structure... 471 General1.0.1 This Code is formulated, in order to implement the national laws and regulations on earthquake prevention and disaster reduction of buildings and municipal projects, implement the principle of prevention first, so that buildings and municipal projects can achieve the target of reducing earthquake damage, avoiding casualties, reducing economic losses after seismic fortification. 1.0.2 All kinds of newly-built, expanded, reconstructed buildings and municipal projects, in areas which have a seismic fortification intensity of 6 degrees and above, must be seismically fortified. The survey, design, construction, use maintenance of engineering projects must comply with this Code. 1.0.3 Whether the technical methods and measures, which are adopted in the construction of the project, meet the requirements of this Code, shall be determined by the relevant responsible entities. Among them, innovative technical methods and measures shall be demonstrated to meet the performance requirements in this Code.2 Basic provisions2.1 Performance requirements 2.1.1 For all kinds of buildings and municipal projects with seismic fortification, their seismic fortification objectives shall meet the following requirements. 2.1.2 For buildings and municipal works with seismic fortifications, the exceedance probability level of frequent ground motions, fortified ground motions, rare ground motions shall not be lower than those specified in Table 2.1.2. 2.2 Earthquake effects 2.2.1 The seismic fortification intensity, of various buildings and municipal works, shall not be lower than the local seismic fortification intensity. 2.2.2 The earthquake impact, which is suffered by each region, shall be characterized by the design basic seismic acceleration and characteristic period, which is corresponding to the seismic fortification intensity; meanwhile it shall meet the following requirements. 2.4.3 The seismic system of urban water supply & drainage and gas-fired thermal engineering shall meet the following requirements. 2.4.4 Structural joints, such as expansion joints, settlement joints, anti-vibration joints, between adjacent buildings (structures) OR between different structural units of the same building, shall take effective measures, to avoid damage caused by collision or extrusion under earthquakes. 2.4.5 The special requirements of the seismic structural system, for structural materials (including special structural equipment) and construction technology, shall be indicated on the design documents.3 Seismic requirements of site and foundation3.1 Site seismic survey 3.2 Earthquake resistance of base and foundation 3.2.1 The seismic check calculation of natural foundation shall be carried out, by adopting the standard combination of earthquake action effect and foundation seismic bearing capacity. The seismic bearing capacity of the foundation shall be the product of the characteristic value of the foundation bearing capacity multiplied by the adjustment coefficient of the foundation seismic bearing capacity. The adjustment coefficient of the seismic bearing capacity of the foundation shall be selected, according to the properties of the foundation soil, BUT it shall not exceed 1.5. 3.2.2 For buildings and municipal projects whose seismic fortification intensity is not less than 7 degrees, when there is saturated sand and saturated silt, within 20 m below the ground, it shall perform liquefaction judgement. For the foundation, where there is liquefaction soil layer, it shall take corresponding anti-liquefaction measures, based on the seismic fortification category and the liquefaction grade of the foundation, in combination with the specific circumstances. 3.2.3 The reinforcement range of piles, in liquefied soil and seismically subsided soft soil, shall be the FROM the top of the pile TO the depth of not less than 1.0 m below the bottom of the liquefied soil layer or the bottom of the seismically subsided soft soil layer. The longitudinal reinforcement shall be in line with the top of the pile. The stirrups shall be reinforced.4 Seismic action and structural seismic verification4.1 General provisions 4.1.1 When calculating the seismic action of various buildings and municipal projects, the design ground motion parameters shall be determined, according to the relevant provisions of Article 2.2 of this Code, based on the fortification intensity. It shall be adjusted according to the following provisions. 4.1.2 The seismic action of various types of buildings and municipal works shall be calculated, using an analysis model, that conforms to the actual working conditions of the structure; it shall meet the following requirements. 4.2 Seismic action 4.2.1 The determination of horizontal seismic action of buildings and municipal works shall meet the following requirements. 4.2.2 For the value of the horizontal earthquake influence coefficient of various buildings and municipal works, it shall meet the following requirements. 4.2.3 Under frequent earthquakes, the standard value of horizontal seismic shear force, of various buildings and municipal engineering structures, shall meet the following requirements. 4.3 Seismic check 4.3.1 The seismic bearing capacity of the section of the structural members shall meet the requirements of the following formula. 4.3.3 The deformation check calculation of various structures, under seismic action, shall meet the following requirements.5 Seismic measures for construction projects5.1 General provisions 5.1.1 The architectural design shall clarify the regularity of the architectural form, according to the requirements of the seismic conceptual design. For irregular buildings, it shall take strengthening measures, according to requirements. For special irregular buildings, it shall be specially studied and demonstrated AND take special strengthening measures. It shall not adopt serious irregular building plans. 5.1.2 For houses with concrete structure, steel structure, steel-concrete composite structure, wood structure, the appropriate structural system shall be selected, according to the comprehensive analysis and selection of factors, such as fortification category, fortification intensity, building height, site foundation conditions, use requirements, building shape. In concrete structure houses and steel-concrete composite structure houses, the concrete strength grade of frame-supported beams, frame pillars as well as the frame beams, columns and joint core areas, whose seismic grade is not lower than grade 2, shall not be lower than C30. 5.1.8 The structure, below the seismic isolation layer, shall be able to ensure the safe operation of the seismic isolation layer, under rare earthquakes; meanwhile it shall meet the following requirements. 5.1.9 The connection, between the isolation bearing and the upper and lower structures, shall be able to transmit the maximum reaction force of the isolation bearing, under rare earthquakes. 5.1.13 In the main structure of the building, at the installation locations of non- structural components, such as curtain walls, enclosure walls, partition walls, parapets, awnings, trademarks, billboards, ceiling brackets, large storage racks, etc., it shall take reinforcing measures, to withstand the seismic action, which is transmitted by non-structural members. 5.1.14 The design and construction of non-load-bearing walls, such as enclosure walls, partition walls, parapet walls, shall meet the following requirements. 5.1.15 The design and construction of architectural decorative components shall meet the following requirements. 5.2 Concrete structure houses 5.2.1 The reinforced concrete structure house shall adopt different seismic grades, according to the fortification category, fortification intensity, structure type, house height. Meanwhile, it shall meet the corresponding requirements for internal force adjustment and seismic structure. The seismic grade shall meet the following requirements. 5.2.2 The potential plastic hinge area of frame beams and frame columns shall be reinforced with stirrups. For the wall piers, coupling beams, frame beams, frame columns, frame-supported frames of seismic wall structures, partially frame-supported seismic wall structures, frame-seismic wall structures, at the potential plastic hinge areas and local stress concentration areas, it shall take reinforcing measures. 5.3 Steel structure house 5.3.1 The steel structure house shall adopt different seismic grades, according to the fortification category, fortification intensity, building height. It shall meet the corresponding requirements for internal force adjustment and seismic structure. The determination of the seismic grade shall meet the following requirements. 5.3.2 For frame structures and unsupported frames in frame-central support structure and frame-eccentric support structure, the upper and lower flanges of the potential plastic hinge area, on the frame beams, shall be provided with lateral supports OR take other effective measures, to prevent out-of-plane instability and damage. 5.4 Steel-concrete composite structure house 5.4.1 The steel-concrete composite structure house shall adopt different seismic grades, according to the fortification category, fortification intensity, structure type, house height, based on the following provisions. Meanwhile, it shall meet the corresponding requirements for internal force adjustment and seismic structure. 5.5 Masonry structure houses 5.5.1 The number of floors and height of multi-floored masonry buildings shall meet the following requirements. 5.5.2 The spacing of seismic transverse walls of masonry structures shall meet the following requirements. 5.5.5 In the seismic design of the house of reinforced small block masonry seismic wall structure, the seismic grade of the seismic wall shall be adopted, according to Table 5.5.5, based on the fortification intensity and the height of the house. When the height of the house is close to or equal to the height boundary in Table 5.5.5, the seismic grade shall be determined, according to the irregularity of the house AND the conditions of the site and foundation. 5.5.6 The design value of seismic shear strength of various types of masonry, which is damaged along the stepped section, shall be a reasonable value.6 Anti-seismic measures for municipal engineering6.1 Urban bridge 6.1.1 The seismic design category of urban bridges shall be selected, according to the seismic fortification intensity AND the seismic fortification category to which it belongs, as shown in Table 6.1.1. 6.1.2 According to the classification in Article 6.1.1 of this Code, the seismic design of urban bridges shall meet the following requirements. 6.1.8 The use of seismic measures for urban bridges shall not lead to major changes in the seismic response of the main components; otherwise, the mutual influence, between the seismic measures and the main components, 6.2 Urban rural water supply & drainage and gas thermal engineering 6.2.1 Urban rural water supply & drainage and gas-fired thermal engineering shall meet the following requirements. 6.2.2 The width of seismic joints of water-containing structures shall not be less than 30 mm. When the maximum deformation value of the structures, on both sides of the joints, exceeds 10 mm, under frequent earthquakes, they shall be appropriately widened. At the same time, it shall clarify the corresponding technical requirements of the water-stop. For double-wall pools that are built next to each other AND work independently, the width of the seismic joints shall not be less than twice the maximum displacement of the single-sided water retaining wall, in case of frequent earthquakes, meanwhile it shall not be less than 50 mm. 6.2.3 The seismic grade of single-floored cast-in-place concrete structures, in urban rural water supply & drainage and gas-fired thermal engineering, shall not be lower than those specified in Table 6.2.3. 6.2.4 The seismic check calculation of various structures in urban rural water supply & drainage and gas-fired thermal engineering shall meet the following requirements. 6.2.5 Gas storage tanks, in gas engineering, shall meet the following requirements. 6.2.6 In urban rural water supply & drainage and gas-fired thermal engineering, the materials for pipes and their connections shall still meet the following requirements. 6.2.7 Rectangular pipes of mixed brick masonry structures shall meet the following requirements. 6.2.8 In urban water supply & drainage and gas-fired thermal engineering, for directly buried socket-type circular pipes and rectangular pipes, flexible connection joints or deformation joints shall be provided, at the following positions. 6.3 Underground engineering structure 6.3.1 The general layout of underground works shall be simple, symmetrical, regular, smooth. The structural system shall be determined, according to the use requirements, site engineering geological conditions, construction methods, etc. It shall have good integrity, to avoid sudden changes in lateral stiffness and bearing capacity of the lateral force-resistant structure. For the slopes on both sides of the entrance and exit passages AND the upwards slope of the entrance, it shall select a reasonable type of opening structure, according to the terrain and geological conditions, to improve its seismic stability. 6.3.3 Earthquake response analysis shall be carried out, for underground works, except for the following situations. 6.3.4 The seismic response analysis model of the underground work shall be able to reflect the actual stress conditions of the surrounding earth retaining structures and internal components. For long-line underground work, which has uniform and regular distribution of surrounding strata and with a symmetrical axis, it is allowed to use the plane strain analysis model; in other cases, it shall use the spatial structure analysis model. 6.3.5 When the seismic response analysis of underground work is carried out, each design parameter shall meet the following requirements. 6.3.10 For underground works located in rocks, it shall take the following anti- seismic measures. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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