How big should a 4.2 meter span beam be, and how many steel bars should be placed?

The beam height is 12-15% of the span of the beam, 13% of the beam span is taken, the beam height is about meters, and the reinforcement depends on the balance load and live load on the beam, it is estimated that 300 kg per square is calculated, and the beam is equipped with 3 16 threaded steel bars, and the beam is equipped with 3 14 threaded steel bars.

For example: the span of 7 meters is not large, generally speaking, the beam height is 500-700, and the heavier the wall on the beam, the greater the beam height. It is recommended that the beam height should not be lower than 500.

As for the reinforcement, the higher the beam height, the less reinforcement there will be. The beam is calculated according to 200x500, the hollow brick wall on the beam is calculated, and the bottom reinforcement needs 3 18 stirrups.

6@200. If it is a solid brick, the reinforcement has to become 3 22 and stirrups 8@200.

Single-span beams. There are mainly the following three forms, namely simply supported beams.

Outrigger beams, cantilever beams.

and fixed beams at both ends. Single-span beams are mainly subjected to bending moments.

It belongs to the bending effect structure, so minimizing the vertical bending moment of the single-span beam is the main problem in the research of single-span beam. Reasonable modeling can reduce the bending moment of the beam, so that it can give full play to its material properties.

If it is 4 meters 4 meters, the column adopts 300 300, the concrete adopts C25, the main reinforcement of the reinforcement adopts 4 secondary steel bars of 18, and the stirrups adopt a diameter of 8mm and a spacing of 150mm; Frame beams are adopted 200 400;C25 is used for concrete, 3 secondary steel bars of 18 are used for the bottom reinforcement of the reinforcement, 2 secondary steel bars with a diameter of 14mm are used for the gluten, and stirrups are made of 250*500 beam sections with a diameter of 8mm and a spacing of 150mm.

As for the reinforcement, if there are no special use requirements, 3 x 16mm steel bars in the upper part and 4 x 20mm steel bars in the lower part can be used.

According to the convention, the beam height is 12-15% of the span of the beam, 13% of the beam span, the beam height is about meters, and the reinforcement depends on the balance load and live load on the beam, give you an estimate, 300 kg per square calculation, the beam is equipped with 3 16 thread steel bars, the beam is equipped with 3 14 thread steel bars, and the stirrups are used with 8 ·@200!

4 m2 span beam, upper slab, slab made of bricks 120 cm high, covered with tiles. How big should I put a few steel bars on the lintel? Thank you.

The general cross-section of the span meter girder is made into 200 500, the lower part of the beam is equipped with 3 18, the upper part is equipped with 2 18 stirrups with 8 spacing 200, and the bearing is encrypted with a length of 750 and a spacing of 100. The height of the meter beam is 50cm, which already includes the height of the floor slab, which means that the floor slab of 12cm is only 38cm under the floor. The reinforcement ratio is the ratio of the area of the longitudinally stressed reinforcement in the reinforced concrete member to the effective area of the member (the area of the axial compression member is the area of the full cross-section).

Among them, it is the reinforcement ratio; as is the cross-sectional area of the longitudinal reinforcement in the tension zone; b is the width of the rectangular section; h 0 is the effective height of the cross-section. ρ=as/bh0。The reinforcement ratio is a parameter that reflects the number of reinforcements.

The reinforcement ratio is a parameter that affects the stress characteristics of the component, and the control of the reinforcement ratio can control the failure mode of the structural component, and the over-reinforcement failure and the less-reinforcement failure do not occur, and the reinforcement ratio is the main index reflecting the economic effect. Controlling the minimum reinforcement ratio is to prevent the failure of the component with less reinforcement, and the failure of less reinforcement is brittle failure, which should be avoided during design. 7 meters span beam height 7000 12=, beam is 50 a modulus, so beam height should be 600mm.

The beam width is 250mm, and the beam size is determined to be 250x600. The beam reinforcement must provide the bending moment and shear force at the beam end, and the reinforcement can be calculated by calculation. Reinforcement:

The reinforcement of houses in construction is generally represented graphically. According to the reinforcement diagram, determine the position, shape and type of reinforcement used in the building.

If it is 4 meters 4 meters, the column is 300 300, the concrete is C25, the main reinforcement of the steel friend hall is 4 secondary steel bars of 18, the stirrups are used with a diameter of 8mm, and the spacing of the file is 150mm; Frame beams are adopted 200 400;The concrete is made of C25, the bottom reinforcement of the steel bar is made of 3 secondary steel bars of 18, the gluten is made of 2 secondary steel bars with a diameter of 14mm, the stirrups are made of a diameter of 8mm, the spacing is 150mm, and the beam section is made into 250*500.

20'40 beams, span 4 meters, 18 steel bars 4, please ask the connoisseur, how much weight can be carried.

Dear, hello, I am happy to serve you, and the answer is as follows: The weight of the 20*40 beam bearing weight is about 20-30 tons. It depends on the size, for example, the concrete should be in C25 or C30, and the maximum bearing capacity per square meter should be between tons and 4 tons.

Under normal circumstances, if all the materials are used in accordance with the regulations, the ground beam of 25 40 can at least bear a weight of about 20 to 30 tons. Therefore, the load of 20*40 beams is about 30 tons.

This question is up to me, it takes a little time to type, so please be patient.

Hello, glad to answer for you, 20'40 girders, span 5 meters, 16 steel bars 4, 20 steel bars 2, the weight that can bear the weight is, this is the result of the software calculation, true and reliable, the code "Building Structure Load Code" also says, I hope my answer will be helpful to you

The size and reinforcement of the load-bearing beam with an 8-meter span should be calculated and designed according to the specific load situation, structural form, material strength and other factors, and cannot be generalized. Based on some engineering experience and references, the following general examples can be given:

Beam section size: 240 500mm or 200 550mm can be taken.

Longitudinal reinforcement at the bottom of the beam: 3 20 or 3 22 can be taken.

Longitudinal reinforcement on the upper part of the beam: you can take 2 18 or 2 16, and add 1 16 at each end of Wuxiang.

Beam waist tendons: you can take 2 left and right 16. Base pulse.

Beam stirrups: You can take No. 8 steel bar, spacing 180-200mm or No. 6 steel bar, spacing 140-160mm, and the spacing at the support is halved.

Beam concrete strength: C25-C30 can be taken.