What is the difference between bridge reinforcement and building reinforcement

There used to be a big difference between bridge reinforcement and building reinforcement.

For steel structures:

In the early days of the founding of the People's Republic of China, there was a shortage of steel, in order to ensure the national economy.

construction, steel priority is given to key industrial sectors, including bridges. And in general industrial civil buildings.

The amount of steel used on it is very small.

It should be, in order to build the Wuhan Yangtze River Bridge.

In particular, the high-strength steel of the time, 16MNQ (16 manganese bridge steel), which is equivalent to the current Q345, was specially developed.

Now that the national economy has developed greatly, we are no longer a country where there is no money to engage in construction, but people are stupid and have money to come quickly, and the vigorous development of steel structure has appeared in the field of construction.

Because I don't know the steel structure of the house construction, I don't know what the mainstream steel model of the steel structure on the house is the A3 (Q235) steel in the past?

The steel grade in the bridge will generally be above Q345.

In addition, the bridge bears dynamic loads, so the impact toughness and fatigue performance of the steel will be very high.

There are other minor differences.

In general, bridge steel will be more conservative than structural steel.

For reinforcement, because the concrete structure of the bridge is mostly a prestressed structure, the prestressed concrete.

The stressed steel bars of the beam are mainly prestressed steel strands.

Tensile strength. The standard value is 1860MPa, and the design strength is 1260MPa.

The ordinary steel bar is in the prestressed beam, which is mainly used as a structural steel bar and safety reserve, and the main reinforcement is HRB335.

It is worth pointing out that shear reinforcement should be used more often, and it should be used strongly.

Charpy beams. Shear reinforcement is generally used with diameters of 12, 14, HRB335.

In the past, R235 was used in housing construction, but now it is developing very strongly, and it is necessary to eliminate HRB335 and promote HRB400 steel bars.

The steel bar used in construction is thinner than that of the bridge, and the bridge generally has a larger span and the steel bar is thicker. In addition, the representation method is different, the building has centralized labeling, and the reinforcement of the bridge is sometimes marked with the spacing of the reinforcement.

What kind of steel bars are generally used in buildings are made of high-quality first-class steel, and there is no difference in the steel bars themselves, but there are differences in the drawings.

See below for specific model indicators and welding.

Kiss. Bridges generally use steel bars for: ordinary steel bars:

r235、hrb335、hrb400、kl400。Prestressed steel bars: steel strands, steel wires, finished rolled rebar.

Specifically, the steel bar model should be selected with reference to: "Technical Code for Bridge and Culvert Construction". Extensions:

Bridge reinforcement mesh: also known as: welded reinforcement mesh, reinforcement welded mesh, reinforcement welded mesh, reinforcement welding branch ruler connected mesh, reinforcement fierce mesh and so on.

It is a mesh in which the longitudinal and transverse steel bars are arranged at a certain distance and at right angles to each other, and all the intersections are welded together. The application of steel mesh is in the fields of beams, columns, floor slabs, roofs, walls, concrete pavement, bridge deck pavement, airport runways, tunnel linings, box culverts, wharf floors, prefabricated components and other fields of industrial and civil buildings. The welding procedure of the welded steel mesh is controlled by the computer to ensure the welding quality and the stability of the steel mesh spacing, and does not lose the strength and cross-sectional area of the original steel bar.

The use of steel welded mesh saves 30% 40% of steel, shortens the construction period by 80%, saves labor by 60%, and greatly reduces costs, thus bringing huge economic and social benefits. If my answer is helpful to you, please give a thumbs up (in the lower left corner), I look forward to your like, your efforts are very important to me, and your support is also the motivation for my progress. If you feel that my answer is still satisfactory, you can click on my avatar for one-on-one consultation.

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There are bottom reinforcement, gluten (support reinforcement), stirrup and waist reinforcement in reinforced concrete beams.

1. The bottom reinforcement is used to bear the positive bending moment of the beam, also called the main reinforcement, in the concrete structure, the basic components such as bending, compression, and tension are mainly used to bear the tensile stress or compressive stress caused by the load. Those that bear tensile stress are usually called longitudinal tensile steel bars and tensile steel bars, and those that bear the stress of pressing silver branches are usually called longitudinal compression steel bars and compression bars, collectively referred to as stressed tendons.

2. Gluten (support bar) is used to bear the negative bending moment of the beam and the erection effect.

3. Stirrups are used to connect the stressed main reinforcement and the frame reinforcement to form a reinforcement skeleton, which mainly bears the shear force and torque. The beam will be subjected to the joint action of shear force and bending moment in the bending and shear area, and the main tensile stress trace in this section is oblique, which will produce oblique cracks, because the stirrups are vertical and intersect with oblique cracks, so they can prevent or limit the generation and development of oblique cracks! Torque works on a similar principle.

4. The effect of the waist tendon is the torsion resistance of the beam It belongs to the structural reinforcement in the design, that is, the mechanics do not need to design to calculate the size of the specific force, and this data can be found according to the structural requirements of the national design code. When the beam is high to a certain requirement, it is necessary to add waist reinforcement, according to how much, how much to add specifications according to the structural requirements and specifications.

5. The hanging bar is a kind of steel bar that transmits the concentrated force acting on the bottom of the concrete beam component to the top, and is a kind of steel bar that improves the shear resistance of the beam to bear the concentrated load, and the shape is like ingots, also known as ingots.

The main effect is: because a certain part of the beam is subjected to a large concentrated load, it may cause oblique cracks on the beam, especially the force acts in the tension zone, in order to make the beam body not produce local serious damage, and at the same time make the material of the beam body play its respective role and set up, mainly arranged in the shear force has a large abrupt change in the part, to prevent the part from producing excessive cracks, causing the destruction of the structure, it is necessary to be equipped with suspension bars, but also with additional stirrups.

Ordinary steel bar: R235, HRB335, HRB400, KL400

Prestressed steel bars: steel strands, steel wires, finished rolled rebar.

The substructure comprises: pier body, pier cap, ear back wall, cushion cap, tie beam, cap beam, stopper, supporting pad stone.

The 403-2 substructure reinforcement comprises the following:

403-2-A R235 Round Steel Bar (Grade).

403-2-B-1 HRB335 Ribbed Steel Bar (Grade)403-2-B-2 HRB400 Ribbed Steel Bar (Grade)403-2-C Other steel (longitudinal stress section steel).

Including pile foundation, cushion cap, pier body.

Don't know what to ask? Is it a rebar specification model or what?

Kiss. Hello, happy to answer your <>

There are more than five kinds of steel bars used in pro-bridge engineering: R235, HRB335, HRB400, and KL400. Prestressed reinforcement:

Steel strands, steel wires, finished rolled rebar. Rebar refers to steel for reinforced concrete and prestressed reinforced concrete, which has a circular cross-section and sometimes a square with rounded corners. Including light round steel bars, ribbed steel wheels, 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 bar and deformed steel bar, and the delivery state is straight bar and disc round two-eyed tung burning. Hope mine can help you <>

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