工程建設標準強制性條文cpecs-b-6房屋建筑部分（英文版）-預覽頁

　

【正文】 degree lower than the protection intensity of the region, and will not be lowered for intensity degree 6. 2. Basic Provisions Seismic Impact, Site and Ground Foundation Antiseismic design specification for buildings GBJ 11 – 89 A building site shall be selected on the basis of the need of the project and the mastery of relevant data on seismic activities and engineering geology, and a prehensive assessment shall be made. When it is not possible to avoid an unfavorable ground section, appropriate antiseismic provisions shall be made。 when antiseismic joints are provided, sufficient width shall be provided according to the intensity, ground class and building type, and the superstructures on both sides of the joint shall be pletely separated. All expansion joints and settlement joints shall ply with the requirements for antiseismic joints. An antiseismic structural system shall ply with all the following requirements: I. There shall be explicit calculation sketches and reasonable transmission route for the seismic actions。 III. The strength grade of concrete shall be no lower than C30 for frame beams, columns and nodes in case of antiseismic class I, no lower than C15 for structural columns, stems, girths and expanded foundations, and no lower than C20 for other types of members。 III. For structures with apparent uneven or asymmetric mass and rigidity distribution, the torsion effect of horizontal seismic action shall be taken into consideration。 T — Self vibration period of structure。 ?Eh, ?Ev — Respectively the partial safety factor of horizontal and vertical seismic action, and shall be taken from Table 。 Evk — Vertical seismic action standard value。 R — Bearing capacity design value of structural member. Bearing capacity antiseismic adjustment coefficient Table Material Structural member Loading status γRE Steel Columns Support between columns in structural steel factory buildings Support between columns in reinforced concrete factory buildings Welding seam on members Deflected pression Masonry Antiseismic walls with structural columns and stems at both ends Other types of antiseismic walls Shearing Shearing Reinforced concrete Beams Columns with axial pression ratio less than Columns with axial pression ratio not less than Antiseismic walls Members of various types Bending Deflected pression Deflected pression Deflected pression Shearing and Deflected tensile In the calculation of standard value of rarely encountered seismic action, the horizontal seismic influence coefficient shall be taken as per Fig. , and its maximum value shall be taken as per Table . Max. value of horizontal seismic influence coefficient for rarely encountered seismic action Table Intensity 7 8 9 amax Design and construction regulations for bent structures JGJ 7 – 91 In areas with antiseismic design protection intensity of degrees 8 or 9, vertical antiseismic proof calculation shall be performed for bent roofing structures. In areas with antiseismic design protection intensity of degree 8, the horizontal antiseismic proof calculation may be omitted for medium and smallspan bent structures with peripheral supports。 III. The anchoring length of longitudinal reinforcement in the frame beams and columns and antiseismic wall connection beams for Grade I and II shall be 5 times of the diameter of longitudinal reinforcement longer than the minimum anchoring length in the nonantiseismic design。 hb the beam height. The minimum total reinforcement ratio of column longitudinal reinforcement shall be taken from Table , and the values in the table shall be increased by for tall highrise buildings on ground of Class IV. Min. total reinforcement ratio of column longitudinal reinforcement (%) Table Type Antiseismic grade I II III IV Central and side columns in frames Corner columns in frames and frame columns The stirrup spacing and diameter in column densified zone shall ply with the following requirements: I. Under normal conditions, the maximum spacing and minimum diameter of stirrups shall be taken from Table 。 the spacing of tying bars between the two rows of reinforcement shall be no greater than 700mm, and their diameter not less than 6mm. The spacing of tying bars at bottom reinforced portions shall be further reduced as appropriate. The reinforcing ratio for the vertical and transversal distributed reinforcement in antiseismic wall plates shall all meet the requirements in Table 。 V. The flue duct, air duct and rubbish duct shall not weaken the wall body。 ?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