How much should be lapped in the construction project brick concrete structure structural column rei

c20：53d； c25：46d；c30：41d。

The lap length is the double anchorage length.

Extended introduction: Setting up specifications.

1.According to the requirements of the seismic code, the structural column is mainly arranged in the seismic wall;

2, 120 (or 100) thick wall when the wall height is less than or equal to 3 meters, the width of the opening is less than or equal to, if not satisfied, the structural column or reinforced concrete horizontal tie beam should be added;

or 190) thick wall When the wall height is less than or equal to 4m, the width of the opening is less than or equal to, if it is not satisfied, the structural column or reinforced concrete horizontal tie beam should be added.

4. When there is no frame column at the corner of the wall and at the junction of the wall of different thicknesses, structural columns should be set.

5. When the wall length is more than 8m (or the wall length is more than 2 times the height of the storey), the structural column should be set in the middle of the wall length (at the edge of the hole when there is a hole).

6. Structural columns should be set on both sides of the larger openings and at the ends of the unconstrained walls, and the structural columns and the wall tie bars should be 2 6@500, and arranged along the full height of the wall.

Different seismic grades have different lap lengths, and different concrete strength grades have different lap lengths. For details, you can take a look at the atlas "11G101-1", which is very clear.

According to the principle of economy and revolution, 1 must try to reduce robbery as much as possible.

HRB400 steel bars with a diameter of 16, concrete strength grade.

is C30, the lap length of the column reinforcement.

ll still needs to be based on the percentage of lap reinforcement area in the same section.

Selection: <>

References: 16G101-1 (replaces 11G101-1) Concrete structure construction drawing plane overall representation method drawing rules and construction details (cast-in-place concrete frame, shear wall.

beams, plates).

In the case of lashing lap joints, and the columns are connected by tension reinforcement, the lap length is equal to millimeters. In the case of compression reinforcement, its lap length is a multiple of the above calculation, which is about 550 mm.

The minimum lap length of the longitudinal stressed steel bar is not only related to the steel bar level, concrete strength, but also related to many factors such as the stress state of the steel bar, the percentage of the joint area, whether it is seismic and the thickness of the concrete protective layer.

Please choose the diameter of the reinforcement according to the concrete strength grade, the type of reinforcement and the percentage of the overlapping reinforcement area in the same section.

Please choose the diameter of the reinforcement according to the seismic grade, concrete strength grade, type of reinforcement and the percentage of lap reinforcement area in the same section.

Reference: 16G101-1 (instead of 11G101-1) Concrete structure construction drawings plane whole body representation method drawing rules and structural details (cast-in-place concrete frame, shear comic wall, beam, slab).

Dear, we are glad to serve you, and the answer is as follows: This is a common mistake we make in construction. The bottom column root is the key part of our overall structure, and special attention should be paid to the lack of integrity of the embedded part of the structure. The embedded part, according to the structural design, can be above the foundation, or above the basement, according to the structural design requirements.

The upper end of the bottom column and the two ends of the other layer columns, at h 6, h (the size of the long side of the column section, the diameter of the circular column), > 500mm, the maximum value of the size of the three dimensions. Within this maximum range, it is not suitable to design the longitudinal reinforcement of the column to connect the late locust head (including mechanical joints, welded joints, and lap joints).

The frame column adopts electroslag pressure welding, and the frame beam adopts the double-sided welding of secondary welders greater than or equal to 5D, both of which are desirable and preferentially adopted, which is the requirement of the specification, see 03G-101However, both joints need to be inspected, and double-sided welding must require concentric circle welding.

Other connection methods include flash butt welding, lap jointing, etc., but columns and beams usually prefer these two connection methods you mentioned.

What is the concrete strength grade C30, the type of reinforcement HRB400, the diameter of the reinforcement 16, and the lap length of the column reinforcement?

The percentage of overlap reinforcement area in the same section is missing.

If the percentage of lap reinforcement area in the same section is 25%, the lap length of longitudinal tensile reinforcement ll is 42d;

If the percentage of lap reinforcement area in the same section is 50%, the lap length of longitudinal tension reinforcement ll is 49d;

If the percentage of lap reinforcement area in the same section is 100%, the lap length of longitudinal tensile reinforcement ll is 56d;

If the percentage of lap reinforcement area in the same section is between 25% and 50%, 50% and 100%, the lap length can be interpolated.