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【正文】 nt to the foundation and superstructure D It is permissible not to take any provision It is permissible not to take any provision Treatment to the foundation and superstructure, or other economic provisions Building Layout and Structural Type Selection Antiseismic design specification for buildings GBJ 11 – 89 If a building with plicated shape is not provided with any antiseismic joint, its local stress and deformation concentration and torsion effect shall be estimated, and its portion likely to be damaged be determined, to take measures for better antiseismic capacity。 III. It shall have necessary strength, good deformation ability and energy dissipation ability。 in the sectional antiseismic proof calculation, the maximum value for horizontal seismic influence coefficient shall follow Table . Max. value for horizontal seismic influence coefficient in the sectional antiseismic proof calculation Table Intensity 6 7 8 9 amax Fig. Seismic influence coefficient curve a — Seismic influence coefficient。 GE — Gravitational load characteristics value。, with the straight portion of the hook no less than 10 times the stirrup diameter. II. Welding or mechanical connection shall be adopted for the longitudinal reinforcement joints in frame beams and columns and in edge members of antiseismic walls, all portions for Grades I and II and the bottom storey column bottom for Grade III and the bottom reinforced portion of antiseismic walls。 in frame for Grade II where the stirrup diameter is not less than ?10, the maximum spacing can be 150mm。 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。 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 。 V. The splicing length of tied reinforcement for Grade I and II shall be 5 times of the diameter of tied reinforcement longer than the minimum splicing length in the nonantiseismic design。 ?w — Wind load bined value coefficient, not considered for ordinary structures, and taken as for relatively tall highrise buildings。 II. Sectional antiseismic proof calculation shall be performed for tall highrise buildings on type IV site for intensity degree 6 and for structures for intensity degree 7 or above. The basic bination of seismic action effect and other load effect in the structural members shall be calculated using the following formula: S=γGCGGE + γEhCEhEhk + γEvCEvEvk + ΨwγwCwwk () Where S — Design value of bined internal force of the structural member, including the design value of bined bending moment, axial force and shearing force。 II. The ratio of measured yield strength value of the bars to the standard strength value of the bars shall be no greater than for design with antiseismic grade I, and shall be no greater than for design with antiseismic grade II. Technical regulations on structural steel for highrise civilian buildings JGJ 99 – 98 The strength to yield ratio of antiseismic structural steel shall be no less than , and the elongation shall be greater than 20%. Seismic Action and Antiseismic Proof Calculation for Structures Antiseismic design specification for buildings GBJ 11 – 89 The seismic action of various types of building structures shall be taken into consideration according to the following principles: I. Under normal conditions, horizontal seismic action can be taken into consideration in both main axes directions of the building structure, and antiseismic proof calculation performed, the horizontal seismic action in each direction shall be fully undertaken by the antilateral force members in that direction。 Buildings of Classes A, B and C shall not be build on dangerous ground sections. For building site of Class I, except for buildings of Class D, the antiseismic structural provisions can be taken at one degree lower than the original intensity, and the seismic action shall still be calculated according to the original intensity, provided that no reduction shall be made in structural provisions for degree 6. The building sites shall be classified into four categories according to ground soil types and thickness of site coverage layer. In the site geological survey, the site shall be divided into favorable, unfavorable and dangerous sections to the building according to the actual needs, and the site class for the building and rock and soil seismic stability (. landslide, collapse) assessment shall be provided。 IV. Provisions shall be made to increase the antiseismic capacity at possible weak portions. — 4 — Structural Materials Antiseismic design specification for buildings GBJ 11 – 89 Any special requirement of the antiseismic structure on materials and construction quality shall be indicated in the design documents. The performance parameters of structural materials shall ply with the following minimum requirements: I. The strength grade of clay bricks shall be no lower than , and that of mortar for the brick ma