What does the middle span of the beam mean, how to determine the number of spans of the beam, and wh

The middle span inside the beam refers to the middle of the span, that is, the center position between the two supports of the beam.

Beams: There are a large number of bent rods in machinery, construction and other projects, such as crane girders and train axles.

In a broad sense, we call this kind of component in which the external force generally bears is mainly transverse force and shear force, and the member deformation is mainly bent as the deformation is called a beam. The classifications of beams are:

1. Functionally, there are structural beams, such as foundation beams, frame beams, etc.; with columns, load-bearing walls.

and other vertical components together constitute a spatial structural system, and there are structural beams, such as ring beams.

Lintel beams, connecting beams, etc., play a structural role such as crack resistance, earthquake resistance, and stability.

2. Beams can be divided into frame beams and shear walls according to structural engineering attributes.

Supported frame beams, inner frame beams, beams, masonry wall beams, masonry lintels, shear wall connecting beams, shear wall dark beams, shear wall frame beams.

3. From the construction technology, there are cast-in-place beams, prefabricated beams, etc.

4. From the material, there are shaped steel beams, reinforced concrete beams, wooden beams, ladled concrete beams, etc. commonly used in the project.

5. According to the cross-sectional form, the beam can be divided into: rectangular cross-section beam, T-shaped cross-section beam, cross-sectional beam, I-shaped cross-section beam, cross-sectional beam, cross-sectional beam, irregular cross-section beam.

6. From the stress state, it can be divided into statically determined beam and super-static fixed beam. A statically determined beam is a beam that has no geometrical change and no redundant constraints. A superstatically fixed beam is a beam that has an invariant geometry and has excess constraints.

7. According to its different parts of the house, the beam can be divided into: roof beam, floor beam, underground frame beam, and foundation beam.

The mid-span refers to the position of the clear span of the beam except for the beam support.

The middle span is the center of the two supports of the beam.

Let's explain the in-situ annotation of the span beam in the figure below

1.JL1: No. 1 foundation girder.

2.(5b): The main beam of the No. 1 foundation has a total of 5 spans, and the two ends are carefully bent and extended.

3.400x800: cross-sectional dimensions of the beam, width 400mm, height 800mm.

4.Y1200x400x300: Foundation beam.

The width of the lower foundation is 1200mm, and the beam plus the armpit: the axillary length is 400mm, and the axillary height is 300mm.

5.Beam stirrups: HRB400 grade boring steel bar, diameter 10mm, spacing 200mm, 4 limb hoops.

6.The bottom of the beam is 4 HRB400 grade steel bars, and the straight diameter is 25mm.

7.The top of the beam is also 4 HRB400 grade steel bars, with a diameter of 25mm.

8.The rib of the stressed steel bar under the beam is 16mm, and the ribs are distributed.

5 ribs 12mm.

Here's an explanation of the codenames:

JL: The code name of the main beam of the foundation.

5b: 5 means that the number of spans of the beam is 5 spans, b here means that there is an extension at both ends of the foundation beam, and a means that there is an extension at one end of the foundation beam.

b: represents the reinforcement at the bottom of the beam.

t: represents the reinforcement at the top of the beam.

y: Here represents the reinforcement at the flange.

For more information on the labeling of JL (foundation beams), please refer to pages 1-30 of the 22G101-3 atlas.

The foundation beam 1,5b represents five spans of hail per mu, cross-sectional width = 400mm, height = 800mmy means plus armpits, and the length of the fast-skinned sail is the grip beam plus the axillary foundation beam length = 1200mm, width = 400mm, height = 300mm

The second row is stirrups, and the number of limbs is in parentheses.

The third row b is the bottom reinforcement, and T is the upper reinforcement.

The fourth row is reinforced with axillary beam stirrups.

1. The concept is different.

The mid-span side beam and the mid-beam are concepts on multiple T-beams, the T-beams on both sides of the mid-span cross-section are mid-span side beams, and the middle T-beams (out of the two pieces on the most side) are mid-span mid-beams.

2. The location of the state is different.

The beam of the bridge is transverse, that is, along the roadbed, the middle is called the middle beam, and the two sides are the side beams, and the side beams are divided into outer beams and inner beams.

A beam has n supports, and there are n-1 spans. The distance between the two support mountain seats is called the span of the beam, and from one support to the other is called a span.

In one or more spans of a beam, the most marginal span is called the side span, and there are two side spans. Among them, it is called the middle span, and the others are called the middle span.

In a building, the distance between the load-bearing structures at both ends of the beam and arch, and the distance between the centers of the two fulcrums, is called the span of the beam.

Generally speaking, there are 3 types of spans of beams commonly used in design:

1. Net belt span: that is, the net distance seen by adjacent supports, the seepage brother does not include the size of the node area, which is considered in the design and construction.

2. Calculate the span: that is, the spacing of the axis of the adjacent support, which is used for model calculation.

3. The total span of the beam: the net span and the supporting width of the two supports; It is used for reed materials and concrete dosage under steel bars.

The number of spans of the beam is the length that defines the beam trial.

In the plate-column structure, a span is counted between the two columns, strictly according to the model at the time of calculation, and according to the way of force transmission, the beam section between the two adjacent fulcrums when calculating Lu Lao is counted as a span. When one end is cantilevered, a is added in parentheses of the beam span number, and when both ends are overhanged, b is added. As with primary and secondary beams, the number of spans is calculated according to the supports calculated by the beam.

Span counting method for beams:

1. The number of spans of the beam is calculated by the number of its supports. That is, the column is the support of the main beam, and the main beam is the early rising bearing of the secondary beam, and each support is a span between the seats.

2. There are n fixed support points in the middle of the beam, and the number of beam spans is n minus one.

The number of spans of the beam is the length that defines the beam trial.

In the slab-column structure, a span is counted between the two columns, which is strictly based on the model of calculating the rolling state dress, and according to the way of force transmission, the beam section between the two adjacent fulcrums at the time of calculation is counted as a span. When one end is cantilevered, the bracket of the beam span number is marked with note A, and when both ends are overhanged, B is added. The primary and secondary beams are the same, and the number of spans is calculated according to the support calculated by the beam.

Span counting method for beams:

1. The number of spans of the beam is calculated by the number of its supports. That is, the column is the support of the main beam, and the main beam is the support of the secondary beam, and there is a span between each support.

2. There are n fixed support points in the middle of the beam, and the number of beam spans is n minus one.

Summary. Good evening, dear, in architecture, a "cross-story beam" refers to a beam that spans between two floors to facilitate the passage of workers or the transportation of materials.

What is the meaning of the cross-layer beam?

Good evening, dear, in architecture, a "cross-story beam" refers to a beam that spans between two floors to facilitate the passage of workers or the transportation of materials.

Kiss, in the construction of the Tomb and the Beam, it is a source of load-bearing structural components, that is, it is usually placed horizontally between the columns, used to support and distribute the load.

The cross-floor beam is a special kind of beam, which not only plays the role of supporting the load, but also connects the structure of two different floors.

It connects the structure of two different floors, and the load is relatively large.

In short, dear, the "cross-floor beam" is a kind of beam connecting two different floors in the building, which has the role of supporting and dispersing the load dissipation, and needs to be professionally designed and constructed to ensure safety and stability.

It is reserved for construction.

Yes, dear, cross-layer beams are generally used in building construction, as temporary structures, to facilitate workers to pass, transport materials activities.

On a construction site, different levels of structures need to be connected so that workers can work between different floors.

The cross-layer beam is a temporary structural component that can easily connect two different levels of structure.

Summary. The mid-span distance between two beams is often referred to as a "beam span" or "inter-beam span", which refers to the length of the span formed between two adjacent beams. In the fields of architecture and structural engineering, beam span is one of the important design parameters, which directly affects the size, material selection, and bearing capacity of the beam.

The mid-span distance of two beams is often referred to as the "beam branch car span" or "span between beams", which refers to the span length formed between two adjacent beams. In the fields of architecture and structural engineering, beam span is one of the important design parameters, which directly affects the size, material selection, and bearing capacity of the beam.

You've done a great job! Can you elaborate on that?

Beam span is an important parameter in architectural or structural engineering that describes the length of the span between two adjacent beams, also known as the "inter-beam span". In the design and construction process, it is necessary to reasonably determine the beam span bucket imitation according to the actual situation, so as to ensure the lifting strength and stability of the beam, and meet the bearing requirements.