【導(dǎo)讀】state.buildings.

　　

【正文】 50 50 35 25 ? Frameshearing wall and frame silo Castinsitu 130 130 120 100 50 Assembled integral 100 100 90 70 ? Castinsitu shearing wall Wall with no support frame 140 140 120 100 60 Wall with part of support frame 120 120 100 80 ? Silo in silo and bundle of silos 180 180 150 120 70 Notes: ① The building height refers to the height from outdoor ground surface to eave, not including that of the part locally protruding out of the roofing, such as water tank and elevator chamber. ② When the building height has exceeded the values specified in the table, there shall be reliable basis for the design and effective measures shall be taken. ③ The height in the table shall be lowered as appropriate for buildings on type IV ground or for irregular buildings. The antiseismic joints shall be provided along the full height of the building. The antiseismic joint can be omitted for the foundation, provided that the structure and connection of the foundation at the location of antiseismic joints shall be enhanced. Between the structural units or between the tower building and skirt, antiseismic joints shall not be provided by using bracketed beams. The width of settlement joints and antiseismic joints shall take into account the requirements for structural top point displacement due to foundation rotation. Light Aggregate Reinforced Concrete Structures Design regulations for light aggregate reinforced concrete structures JGJ 12 – 99 In the antiseismic design for light aggregate reinforced concrete structural members, different antiseismic grades shall be adopted according to the structure type, building height and protection intensity, and the corresponding calculation and structural provision requirements shall be plied with. For frame beams, columns and nodes, when they are designed for antiseismic grade I, the strength grade of light aggregate concrete shall be no lower than CL30, and when they are — 12 — designed for antiseismic grade II and III, the strength grade of light aggregate concrete shall be no lower than CL20. The strength grade of light aggregate concrete for shearing walls shall be no less than CL20. In the light aggregate concrete structures in seismic zones, the strength grade of light aggregate concrete shall be no greater than CL40. 4. Antiseismic Design for Multistoreyed Masonry Structures General Provisions Antiseismic design specification for buildings GBJ 11 – 89 The total height and number of storeys of multistoreyed masonry buildings shall not exceed the provisions in Table 。 the total height of buildings with less transversal walls, such as hospitals and teaching buildings, the height shall be reduced by 3m and the number of storeys reduced by one from the provisions in Table 。 the total height and number of storeys of buildings with very few transversal walls on each floor shall be further reduced as appropriate according to actual conditions. Limit values for total height (m) and number of storeys of masonry buildings Table Type of masonry Min. wall thickness (m) Intensity 6 7 8 9 Height Storeys Height Storeys Height Storeys Height Storeys Clay brick 24 8 21 7 18 6 12 4 Small concrete blocks 21 7 18 6 15 5 Not appropriate Note: The total building height refers to the height from outdoor ground surface to eave, and it can be counted as from the outdoor ground surface for full basement. The structural system of multistoreyed buildings shall ply with the following requirements: I. The structural system with transversal wall bearing the load or longitudinal and transversal wall bearing the load jointly shall be adopted in preference。 V. The flue duct, air duct and rubbish duct shall not weaken the wall body。 when the wall body is weakened, reinforcing measures shall be taken for the wall body。 The spacing of transversal walls in multistoreyed buildings shall not exceed those listed in Table . — 13 — Max. spacing of antiseismic transversal walls (m) Table Type of building and building roofing Clay brick building Small block building Degree 6 Degree 7 Degree 8 Degree 9 Degree 6 Degree 7 Degree 8 Castinsitu assembled reinforced concrete 18 18 15 11 15 15 11 Assembled reinforced concrete 15 15 11 7 11 11 7 Wood 11 11 7 4 Not appropriate The antiseismic shearing strength design value for damage along stepped section in various types of masonry shall be determined using the following formula: fvE=?Nfv () Where fvE — Antiseismic shearing strength design value for damage along stepped section in the masonry。 fv — Shearing strength design value for masonry in nonantiseismic design。 ?N — Masonry strength normal stress influence coefficient, to be taken from Table . Masonry strength normal stress influence coefficient Table Type of masonry ?0/fv Clay bricks Small concrete blocks Note: ?0 is the average pressive stress on the masonry section corresponding to the characteristics value of gravitational load. Building of Clay Bricks and Porous Bricks Antiseismic design specification for buildings GBJ 11 – 89 In multistoreyed clay brick buildings, reinforced concrete structural columns (hereinafter referred to as structural column) shall be set according to the following requirements: I. The locations of structural columns shall normally meet the requirements in Table . — 14 — Requirements on setting structural columns in brick buildings Table Number of storeys Location of structural columns Degree 6 Degree 7 Degree 8 Degree 9 4 and 5 3 and 4 2 and 3 Corners of outer walls, intersection of transversal wall and outer longitudinal walls at staggered portion, both sides of fairly large openings, intersection of inner and outer walls of large roo