Design of steel structure girders, dimensions of frame structure beams

Landlord, like this kind of problem that needs to be calculated, you still give a little point First of all, the span is too large, and it is recommended to use truss steel beams.

If you have to use H-beams, the cross-sectional height will be large.

Here's how to design:

1.Primary selection of cross-sections.

I estimate that hot-rolled H-beam can no longer meet your requirements, and the highest hot-rolled steel is only 900

You use hn900x300 to calculate first, most of them are not enough. (The calculation is as follows). If it is not enough, only welded H-beams are used. The advantage can also be considered to make a variable cross-section according to the constraints of your beam ends.

2.Strength check.

3.Overall stability check.

4.Local stability check.

5.Stiffness check.

6.Stiffener design.

7.Node design.

8.Beam splicing design.

Then it's OK, just draw the picture above.

The relevant formulas of each step, I will not type it out here (I'm afraid I have to type thousands of words) and ask the landlord to read the "Steel Structure Design Code" and "Steel Structure Design Manual" by himself

There are detailed calculation methods and formulas for each step.

Above is a do-it-yourself method.

In fact, if you use more software design, you will have more design software.

I'm not going to type them all out here.

Generally, according to the design of simply supported beams, the 22-meter span is normally controlled by deflection and other deformations, as long as the deflection is controlled, the strength should not be a big problem.

There are many factors that go into consideration in the design!

The 22-meter span is quite large! Then high overall and local stability is required!

Hey, I can't say! Your load is not given! Can't design!

Steel structure girder design steps:

Here's how to design:

1.Primary selection of cross-sections.

HN900X30 can be used, if it is not enough, only welded H-beam is used. The advantages can also be considered to be made into variable cross-sections according to the constraints of the beam ends.

2.Strength check.

3.Overall stability check.

4.Local stability check.

5.Stiffness check.

6.Stiffener design.

7.Node design.

8.Beam splicing design.

Next, just draw the picture above.

For the relevant formulas of each step, you can read the "Steel Structure Design Code" and "Steel Structure Design Manual", which have detailed calculation methods and formulas for each step.

Introduction to steel structure:

Steel structure is a structure that is mainly composed of steel materials and is one of the main types of building structures. The structure is mainly composed of steel beams, steel columns, steel trusses and other components made of section steel and steel plates, etc., and the components or components are usually connected by welds, bolts or rivets. Because of its light weight and simple construction, it is widely used in large-scale factories, venues, super high-rise buildings and other fields.

Beams of such spans! How can there be such an exaggerated span in housing construction?

The dimensions of the frame structure beam are 25 cm wide for the main beam, 50 cm for the high base brightness, 20 cm for the width of the secondary beam, and 30 cm for the height.

The two-way stress of the monolithic plate bridge has a large stiffness, which is convenient to make various special-shaped structures, and is generally a solid cross-section, and the material utilization rate is low. The frame beam and the frame column form a frame structure system, which is the main beam of the frame structure, which bears the load from the secondary beam and the floor slab, and transfers the load to the frame column.

What are the precautions for the construction of cast-in-situ slab beams:

1. The use of full shelves for construction, you need to do a foundation treatment under the shelves. The shelf is also to pass a preload, the gravity of the accumulation can be said to be twice the weight of the plate beam heavy oak filial piety, the bracket preload can not be less than seven days, and the detection of the decline is also to be flat, the preload for three consecutive days can not be greater than three millimeters, the foundation can meet the requirements.

2. Before pouring the cast-in-place slab beam, check the expansion joints, railings, and whether the embedded parts such as drainage holes and bearings are complete. The top and bottom plates of the plate girder will be relatively thinner, so it is necessary to use the appropriate aggregate particle size and carry out the inspection. When vibrating, it is necessary to prevent damage to the PVC pipe, and plugging plates should be set on both sides of the pipe, so as to prevent concrete and water from dripping inside the pipe.

3. Before pouring the concrete of the bridge deck, it is necessary to remove the slurry and oil stains on the top of the beam, so as to ensure that the old and new are mixed together, and the frame should be slowly settled, and its distance should be symmetrical. <>

As the name suggests, a structural beam is a structural beam made of steel.

Steel structure is a structure mainly made of steel, which is one of the main types of building structure. Steel is characterized by high strength, light weight and high stiffness, so it is particularly suitable for building large-span and ultra-high and super-heavy buildings; The material has good homogeneity and isotropy, which is an ideal elastomer, which is most in line with the basic assumptions of general engineering mechanics. The material has good plasticity and toughness, can have large deformation, and can bear the dynamic load well; short construction period; It has a high degree of industrialization and can carry out specialized production with a high degree of mechanization; The processing accuracy is high, the efficiency is high, and the airtightness is good, so it can be used to build gas tanks, oil tanks and transformers. Its disadvantage is poor fire resistance and corrosion resistance.

It is mainly used for load-bearing skeletons in heavy-duty workshops, plant structures under dynamic loads, plate-shell structures, towering TV towers and mast structures, long-span structures such as bridges and warehouses, high-rise and super high-rise buildings, etc.

The beams of the steel structure are made of steel plates.

Beams made of steel structure!!

The steel box girder is generally composed of a roof, a bottom plate, a web, and a diaphragm, a mediastinum and a stiffener that are connected by all-welding. The roof is an orthotropic bridge deck composed of a cover plate and a longitudinal stiffener.

The thickness of each plate of the typical steel box girder can be: cover plate thickness 14mm, longitudinal U-shaped rib thickness 6mm, upper mouth width 320mm, lower mouth width 170mm, height 260mm, spacing 620mm; The thickness of the bottom plate is 10mm, and the longitudinal U-shaped stiffener; The thickness of the oblique web is 14mm, and the thickness of the middle web is 9mm; Diaphragm spacing, thickness 12mm; Beam height 2.

Steel plate box girder is a common structural form in engineering. In order to study the influence of diaphragm spacing on the distortion of simply supported steel box girders under concentrated load, the variation curve of the maximum distortion effect with the number of diaphragms was obtained by setting up simply supported steel box girders with different numbers of diaphragms and comparing their distortion effects and rigid torsional effects under concentrated loads. The concentrated load is applied at the top of the box girder web, and the load decomposition method is used to calculate according to the four working conditions of distortion, rigid torsion, symmetrical bending and eccentric load.

From Duoduoluo Bridge to Sutong Bridge, from Hangzhou Bay Sea-crossing Bridge to Xihuomen Bridge, steel box girders have been more and more widely used. This topic will introduce the development history and classic engineering of steel box girders, the construction and design, testing and maintenance of steel box girders, and lead everyone to understand steel box girders, and hope to achieve the effect of throwing bricks and attracting jade.

How to avoid rebar by punching holes in beams.

1. Understand the intention of each hole before punching, and understand the structure of the house and the internal and external conditions;

2. Mark each hole position clearly, and observe the direction of the hydropower pipeline;

3. Punch on both sides of the beam as much as possible, and the force on both sides is minimal;

4. Punch the hole on the beam with a wall below;

5. Punch the hole at the top of the beam as much as possible, and the top is less stressed;

6. Make small holes in the beam as much as possible;

7. The height of the beam is 20 cm, and the upper and lower holes shall not be punched; The lower five centimeters of the beam are strictly forbidden to be punched. Usually there is a main reinforcement at the lower three centimeters of the beam, and it is strictly forbidden to hit the main reinforcement.

If the horizontal hole is in the middle, because the force of the beam is distributed in this way, the beam is subjected to pressure, and its reinforcement is auxiliary reinforcement, generally two auxiliary reinforcement. The beam is subjected to tensile force, and its reinforcement is the main reinforcement, if the span is large, it will exceed two main reinforcements, (generally three).Even if the span of the beam is large, the waist tendon is also on the upper side, not in the middle, only the middle is between the two, so it should be punched in the middle of the potato state.

If you play vertical space, you have to count the span of your beam, the span is very small in the middle, and the span is large and a little bit in the middle, because there is also a main reinforcement in the middle, only in this way will the structure not be damaged.