In what direction is the stressed reinforcement of a reinforced concrete unidirectional slab arrange

The reinforcement in the direction of the length of the slab span is placed at the bottom, and the reinforcement in the direction of the length of the long span is placed on top of the reinforcement in the direction of the length of the short span.

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The difference between one-way and two-way plates is actually this force problem. The direction of the stress ribs of the one-way plate is parallel to the beam, that is, the direction of the short side.

The stressed reinforcement of the unidirectional plate is arranged parallel to the short side, and the reinforcement should be arranged in the lower row.

In the design of one-way slabs, there are three types of stress reinforcement, distribution reinforcement and structural reinforcement. Where:

1) Arrange the stressed steel bar along the short span direction as a tensile steel bar, which is used to bear the bending bearing capacity of the positive section of the slab;

2) The non-stressed reinforcement arranged in the vertical stress direction is distributed reinforcement. Its function is to better distribute the load to the stressed reinforcement, and at the same time to fix the position of the stressed reinforcement when pouring concrete, and to resist the tensile stress caused by the shrinkage and temperature change in the perpendicular direction to the stressed reinforcement.

3) The structural reinforcement of the slab mainly refers to: 1) the negative reinforcement of the superstructure of the simply supported edge of the slab; 2) when the stressed reinforcement of the unidirectional plate is parallel to the beam, the negative reinforcement of the superstructure perpendicular to the beam arranged along the beam direction; 3) Structural reinforcement that controls the temperature of the plate and shrinkage cracks. Structural reinforcement generally refers to the reinforcement that is not stressed much but is more cumbersome and complex to calculate, so it is configured according to the specification.

The action is to resist the additional stresses that arise due to various causes. Structural reinforcement is not only found in slabs, but also in beams, columns, foundations, and other components. In a sense, the distributed reinforcement in the slab is also a type of structural reinforcement.

cast-in-place concrete floor slab.

1. The lower steel bar of the floor slab (by the template), the short-span steel bar is below, and the long-span steel bar is on the top;

2. The upper steel bar of the floor slab (by the concrete surface), the long-span steel bar is at the bottom, and the short-span steel bar is at the top;

Because your question is not clear, Sun Zaohao doesn't know if what you want to ask is this rock slippery question.

Concrete. Concrete, for short"Concrete (tóng).": Yes, it refers to the general term of engineering composite materials that cement aggregates into a whole by cementitious materials.

1. Single rib is used for one-way plates, that is, plates with long sides that are more than twice as long as the short side.

The load of the unidirectional plate is transferred to the short side, i.e. to the long side.

2. Double ribs are used for two-way plates, that is, boards with long sides and short sides that are almost as long.

The load distribution of the two-way plate should be divided into load areas, and the plate should be divided into two closed equilateral triangles with the bottom of the short side and two isosceles trapezoidal load areas with the bottom of the long side, the load area of the two long sides is trapezoidal, and the load area of the two short sides is triangular.

After the load is transferred to the old sedan ear beam, it is applied to the beam in the situation of uniform wiring load.

Summary. Dear, hello, the short direction of the one-way plate is right to arrange the stressed steel bar, the one-way plate, parallel to the short side of the plate is the direction of the stressed steel bar, and the other direction is the direction of the distribution of the steel bar.

Kiss, hello sleek and lacking, the short direction of the one-way plate is arranged in the direction of the stressed steel bar, so that the orange argument is right, the one-way plate, parallel to the short side of the plate is the direction of the stressed steel bar, and the other direction is the direction of the distribution of the steel bar.

Rebar refers to steel for reinforced concrete and prestressed reinforced concrete, which is circular in cross-section, sometimes square with sails and premature fillets. Including round steel bars, ribbed steel bars, and torsion steel bars. The steel bar for reinforced concrete refers to the straight bar or wire strip steel used for reinforced concrete reinforcement, and its shape is divided into two types: light round steel residual bar and deformed steel bar, and the delivery state is straight bar and disc round.

The light round steel bar is actually the small round steel and disc round steel of ordinary low carbon steel.

Answers]: c, d, e

2021 new textbook p21 page.

This question assesses the characteristics and reinforcement requirements of reinforced concrete components. The main components include beams, plates, columns, and the stress characteristics of the plate masking: according to the bending situation

One-way and two-way plates. According to the support situation: simply supported plate and multi-span continuous plate.

1) One-way plate: two pairs of side support, bending in one direction; When the long side and the short side are 3, it can be calculated as a one-way plate that is stressed along the direction of the short side. (2) Two-way board:

Four-sided support, two-way bending. When the long side and the short side are 2, it should be calculated as a two-way plate; When 2 long side and short side 3, it should be calculated according to the two-way plate; (3) Continuous beams and plates: there are positive bending moments in the span and negative bending moments in the supports.

In the reinforced concrete unidirectional slab, the area and spacing of the distributed steel bars should meet the cross-sectional area of not less than 15% of the area of the stressed steel bar, and the spacing should not be more than 300mm.

Reinforced concrete floor slab with two-way reinforcement for span 5 meters, HRB400, 8 10, @120 150

Slab reinforcement provisions: reinforced concrete slab is a flexural member, according to its role is divided into: bottom stress bar, upper negative bar, distribution bar.

1. Stress tendons.

It is mainly used to withstand tensile forces. The arrangement of the stressed reinforcement of components such as cantilever slab and basement floor is at the upper part of the slab.

Second, the distribution of steel bars.

It is mainly used to make the load acting on the plate surface evenly transferred to the stressed steel bar; Resistance to tensile stresses arising from temperature changes and concrete shrinkage perpendicular to the slab span; At the same time, it is also tied together with the stressed steel bar to form a skeleton to prevent the displacement of the stressed steel bar when the concrete is poured.

3. Structural reinforcement.

In order to avoid cracks in the upper part of the support after the grip plate is stressed, it is usually arranged in the upper part of these parts with tension reinforcement, which is called negative reinforcement.

Fourth, the board is opened.

1. When the side length of the round hole or square hole perpendicular to the direction of the plate span is less than 300mm, the stressed steel bar of the plate can be bypassed the hole, and there is no need to strengthen the comma key.

2. When 300 d 1000mm, reinforcing steel bars should be arranged along each side of the hole edge, and its area is not less than 1 2 of the area of the stressed steel bar that is cut off within the width of the hole, and not less than 2a10, 3, when d > 300mm and there is a concentrated load around the hole or when d > 1000mm, a side beam should be added to the edge of the hole.

The one-way plate is often referred to as the cantilever plate, in which the configuration method should be single-layer bidirectional, and the main difference between the two methods is the spacing of the plate reinforcement. Normally, the spacing is equal, and in special cases, one third of the plate and beam will be insulated, and the other two-thirds will be arranged with conventional spacing.

The one-way plate is not a cantilevered plate, it is relative to the two-way plate, the two-way plate refers to the 4 sides are stressed, and the one-way plate is only stressed in two directions (the 4 directions actually have supports), and it is a relative two directions. Usually, when the length exceeds the width of the board, it is considered a one-way board.

If it is two adjacent directions, such as an air conditioning panel, it also belongs to the cantilever panel.

As for the reinforcement mode, it is generally a double-layer two-way, or a single-layer two-way + support reinforcement, when a single layer, according to the design requirements, when the plate is relatively thick, the temperature reinforcement may be added, which is connected to the support reinforcement to play the role of surface layer crack prevention.