Can the dark beam in the plate bear the load, and whether the dark beam on the plate is the same as

Dark beam: A flexural member that bears a vertical load.

We can recognize the dark beam from the following attributes:

1. The position of the dark beam is that it is completely hidden in the slab component or concrete wall component, which is the reason why it is called the dark beam.

2. The reinforcement arrangement of the dark beam is very similar to that of the single beam and the frame beam components.

3. The dark beam always works together with the plate or wall components.

4. The dark beam in the plate can improve the bending capacity of the plate, so it still has the general force characteristics of the beam.

5. The dark beam in the concrete wall is more complex, and it is no longer a simple flexural component, which strengthens the node structure of the wall and the roof on the one hand, and provides edge constraints for the transverse stress wall on the other hand. Strengthen the rigid connection between the wall and the roof.

Extended information: the position relationship between the dark beam and the vertical and horizontal reinforcements of the shear wall:

The vertical reinforcement of the shear wall should be continuously penetrated on the outside of the longitudinal reinforcement of the dark beam, and the vertical distribution of the reinforcement of the upper and lower floors of the floor should not be considered for anchoring in the dark beam; The horizontal distribution reinforcement of the shear wall is continuously arranged on the outside of the stirrups of the dark beam, and a horizontal distribution reinforcement at the same horizontal height with the longitudinal reinforcement of the dark beam can not be provided;

When the designer separately arranges the side longitudinal bars for the dark beam, the horizontal reinforcement of the shear wall is only arranged to the bottom position of the dark beam, and the side longitudinal bars of the dark beam are arranged outside the stirrups of the dark beam.

In the actual construction, there are dark beams on the same wall at the same time.

Dark beams in plates-in-plates can bear loads.

The function of the dark beam is to enhance the horizontal resistance of the shear wall or to improve the stress distribution of the local vertical concentrated load. The main function of the concealed beam is to increase the integrity of the structure, strengthen the out-of-plane stiffness of the shear wall, and the purpose of setting stiffeners for the steel beams in the steel structure. The concrete of the dark beam is the concrete of the wall, and the dark beam is only added with the reinforcement cage specified in the specification.

Dark beams in the slab can:

1. On the mezzanine on the stairs, leave a hole when the sandwich plate is reinforced, and set up a dark beam on the edge of the hole.

2. The living room and dining room are sometimes L-shaped, which is beautiful and has a short dark beam.

3. Some problems should be beautiful or high, and dark beams need to be set.

4. The beamless floor is set up with dark beams in the column belt range due to shear and punching resistance.

5. For the complex structure of the force transmission system, such as the irregular floor knot, the dark beam is usually set to divide it into a regular grid.

Dark beams are also known as anti-beams. It manifests itself not under the slab, but above the slab, and the presence of the beam cannot be seen from below. Only adding steel bars to the floor slab can only be regarded as the reinforcement of the floor slab, strictly speaking, it cannot be regarded as a girder or ring beam.

Dark beams on the slab are different from frame beams.

Functionally, the frame beams and columns work together to play the role of earthquake resistance. Dark beams are generally used in the case of openings, walls on the slabs or corner windows in the house, etc., to strengthen the floor slab.

In construction, the structure of the frame beam is also more complex than the dark beam on the plate, the frame beam can see the flat atlas, and the general design of the dark beam requires an anchorage length.

It depends on what is used as the support, and the frame column is the same, not the same.

Different. Functionally, it plays a role in strengthening the floor slab.

In terms of construction, the dark beam should be simple, and the general design requires an anchorage length.

Kiss! Hello, happy to answer your <>

Pro: Don't set the dark beam too thin. The middle beam, the dark beam is too small and not enough to weigh. If the formwork is removed, the floor slab will open and sink as a whole.

There are generally two ways to add dark beams, one is to directly wear several large steel bars in the paved roof reinforcement. For example, we have two layers of roof steel bars paved, and then this roof steel bar is 12, and then add a few larger ones, plus two or more 20 ones. The load bearing of the prefabricated slab itself is relatively high, but of course if you add the beam below, the load will be higher, which is certain, but whether it needs to be increased, it is known only after the budget and calculation of civil engineering, otherwise the amount must not be good to look at after the addition, and it is good to decide according to the need, but the load bearing must be beneficial to the floor slab after the increase.

Hope mine can help you <>

Do you have any other questions?

Summary. We are happy to answer for you, and the answer to your question is: the 12 cm floor slab can be used as a dark beam with a diameter of 22 mm steel bars does not play a big role.

This is because in the 12 cm floor slab, the steel content in the concrete structure is too large when the 22 mm diameter steel bar is used for the dark beam, and it does not play its due role.

I am glad to answer for you, and the answer to your question is: the 12 cm floor slab can be used as a dark beam, and the steel bar with a diameter of 22 mm is not very useful. This is because in the 12 cm floor slab, the steel content in the concrete structure is too large when the 22 mm diameter steel bar is used for the dark beam, and it does not play its due role.

There are no beams in the hall with a span of 4 meters 9 x a depth of 8 meters 6, and now I want to use a double Luchang layer with a two-way diameter of 10 mm of steel bars, and then pour 12 cm of concrete, is there a problem with the span of the floor slab? The mold is ready. If you are afraid that it is not stable, what is the best solution to guess and disperse it?

I would like to ask if the 12 cm concrete floor slab can be added with dark beams?

Is it useful to add dark beams to 12 cm floor slabs?

Dear Yes.

The specification of the stirrups of the pro-12 cm plate thick dark beam is 12. A steel bar with a diameter of 10 mm should be used for the upper part of the bench beam, and a steel bar with a diameter of 25 mm should be used for the lower part of the brigade. In order to stabilize the girder, 2 should be buried in the upper part and 5 in the lower part.

In addition, it is necessary to put a steel bar with a diameter of 10 mm on the side of the girder, a total of 4, and 2 on each side to ensure stability.

Pro: Useful.