1, plate
One-way slab: the minimum thickness of one-way slab of roof slab is 60mm, that of civil building is 60mm, that of industrial building is 70mm, and that of floor slab under roadway is 80mm.
Two-way slab: the minimum thickness is 80 mm
Multi-ribbed floor: the minimum thickness is 50 mm.
Thickness of cantilever plate root: when the cantilever length is not more than 500mm, the minimum thickness is 60mm；; When the cantilever length does not exceed 1200mm, the minimum thickness is 100mm.
Flat plate: the minimum thickness is150 mm.
Cast-in-place hollow floor slab: the minimum thickness is 200mm.
Step 2 light
The size of the beam is not given in the specification, but the diameter of the steel bar should not be less than10 mm; When the beam height is not less than 300mm; When the beam height is less than 300mm, the steel bar diameter should not be less than 8 mm
The width of frame beam of seismic frame structure should not be less than 200mm.
According to the topic, the beam section can be less than 300 mm with two steel bars with a diameter of 8.
3. Cylinders
According to the seismic grade and the number and shape of buildings, the minimum cross section of columns is different.
The minimum section of the column is 300mm * 300mm； when the four-level earthquake resistance or the building does not exceed two floors; When the first, second and third level seismic fortification and the building is more than two floors, the minimum section of the column is 400 mm× 400 mm.
The diameter of the cylinder, the minimum diameter is 350mm when the earthquake resistance is level 4 or the building does not exceed two floors; When the earthquake resistance is Grade I, II and III and the building has more than two floors, the minimum diameter is 450 mm..
Extended data
When the structure is a reinforced concrete shear wall structure, the minimum thickness of the shear wall shall meet the following requirements:
Class I and II earthquake resistance, the minimum thickness of the wall is 160mm, and should not be less than1/20 of the height of the floor or the length without limbs; Grade III and IV earthquake resistance, the minimum thickness of the wall is 140mm, and should not be less than 1/25 of the story height or limb length. When there is no wing wall or end column, the first and second levels should not be less than116, and the third and fourth levels should not be less than 1/20.
Strengthen part of the bottom wall, the first and second level earthquake resistance, the minimum thickness of the wall is 200mm, and it should not be less than116 of the height of the floor or the length of no limbs; Grade III and IV earthquake resistance, the minimum thickness of the wall is 160mm, and should not be less than 1/20 of the story height or limb length. When there are no wing walls or end columns, the first and second levels should not be less than112 with storey height or without limb length, and the third and fourth levels should not be less than116 with storey height or without limb length.
Code for Design of Concrete Structures (GB 500 10-20 15), Articles 9. 1.2 and 9.2. 1 (published by China Building Industry Press).
National Code for Seismic Design of Buildings (GB 500 10-20 16), Articles 6.3. 1, 6.3.5, 6.4. 1 (published by China Building Industry Press).