Which of the trusses is the strongest? Structural design What are the advantages of trusses

Fixed trusses: The strongest of the trusses, with high reusability, the only drawback is the higher cost of transportation. The products are divided into two types: square tube and round tube.

Folding trusses: The biggest advantage is that the transportation cost is low and the reusability is slightly less. The products are divided into two types: square tube and round tube.

Butterfly truss: the most artistic one of the trusses, with a peculiar shape and beautiful shape. Ball joint truss:

It is also called the ball joint, which has beautiful shape and good solidity, and is also the one with the highest cost in the truss. I believe that everyone is very familiar with the stage truss, whether it is in real life or on TV, we will often see gorgeous stage effects, these are to play a supporting role. In practice, this kind of truss not only needs to be able to build the stage, hang the background cloth and audio and video lighting, etc., but most importantly, to ensure its sturdiness.

As we have seen, there are many different styles and categories of stage trusses, and the one we see the most is the standard type, which is processed and formed in accordance with the relevant standards in the industry and then built, and the structure is relatively simple and the installation is not complicated. There is also a lightweight type, which is obviously designed for smaller stages, and its composition material is slightly thinner than that of the standard type, so the bearing capacity is smaller than that of the standard type, and it is only suitable for small performances. There is also the super strong type, which is specially designed for some special large stages, and this kind of truss is the strongest of all and has the greatest bearing capacity.

In addition to the above classifications, stage trusses are sometimes divided according to their shape, such as triangular trusses, trapezoidal trusses, and polygonal trusses.

Construction method: first connect all the columns on the ground; Connect all the beams to the ground as well; erect two columns in any adjacent area, with someone below them to hold them on, to prevent them from falling over; Place the corresponding beam under the two columns, place a ladder under each of the two columns, one person holds one end of the beam, and the other person holds the other end of the beam, and climbs the ladder at the same time, and connects the beam to the column through screws; After the beam is connected, someone below should be held to prevent it from falling over; Then erect the nearest column, and then connect another beam in the same way, noting that the beam that is connected after it is best to be at an angle to the previous beam, so that these rows of frames will not fall down; After all the columns are erected, connect all the beams and check whether the screws are tightened to prevent sliding buckles; Framed light box cloth screen. <>

Truss features:

1. Lightweight. 2. Large span.

3. Save the amount of steel.

4. The force system is simple.

5. All of them are two-force rod units.

6. The construction is convenient and the construction speed is fast.

Advantages of truss: 1) The design, production and installation of the truss are simple;

2) The truss adapts to a wide range of spans, so its application is very extensive.

Disadvantages of truss: 1) the structural space is large, and the height h of the middle span is large, generally (1 101 5) l0, which brings a heavy hill to the building body, and the single-story building is particularly difficult to deal with;

2) The lateral stiffness is small, especially the steel roof truss, and the support needs to be set up, and the truss is connected into a whole to make it have spatial rigidity to resist the longitudinal lateral force, and the support determines the cross-section according to the structural (slenderness ratio) requirements, and the steel is consumed and the material is not fully utilized.

Truss advantages:

1) The design, production and installation of the truss are simple;

2) The truss adapts to a wide range of spans, so its application is very extensive.

1. First arrange the four bases in the approximate position on the ground, and adjust the supporting legs below to make them in a horizontal plane;

2. Insert the part under the oblique support on the outside of the base on the four corners, and insert 2 on each corner, a total of 8;

3. Fix the reverse head on the base with screws, and pay attention to the rotation direction of the reverse head to be consistent with the one marked in the figure;

4. Put a square sleeve on the reverse head;

5. Connect the beams on the ground;

6. The two ends of the beam are connected with the two square sleeves on both sides respectively, and the beam part is assembled on the ground at this time;

7. Connect the column truss lying flat, and then screw one end on the reverse head, and the other end screws on the cross arm, and the hanging hoist and the cross arm are linked at the same time, and the function of the hoist is used to lift the cross beam truss below;

8. Multiple people work together to slowly erect the column truss, be careful not to push the column with too much force, and then fix the screws on the reverse head;

9. After the column is erected, the hook below the hanging hoist is hooked to the following beam through the sling;

Individuals slowly pull the hanging hoist together to pull the beam to the left and right positions of the person's head;

11. Install lighting and sound equipment on the beam;

Individuals pull the hoist together to stop at a predetermined height;

13. Tighten one end of the oblique support and the column, and tighten the horizontal support of the other end and the base, so that the aluminum alloy frame is built.

(1) By the balance system, fey + fby-40-60 = 0n (fey represents the vertical support reaction force at point e).

fby*15+40*20+60*5=0n*m (find the moment of bending the shirt at point e), and calculate fey=

2) Vertical section of the truss H-G section is dissected and stress analysis is carried out

fh-g+f2+f1*cos45=0 (the sum of transverse stresses is 0); The sum of the vertical stresses is 0); fh-g*5+60*5-f1*sin45*5=0 (me=0), the above three formulas are obtained f1=tensile force), f2=Danzen dust tension). According to the law of the two-force rod, it is easy to tell that it is a zero rod and the f3 stress is 0.

Structural characteristics: The force of each member is mainly unidirectional tension and compression, and the bending moment and shear force distribution can be adapted to the internal structure through the reasonable arrangement of the upper and lower chords and web members. Due to the self-equilibrium of the tension and compression forces in the horizontal direction, the whole structure does not produce horizontal thrust on the support.

The structure layout is flexible and has a wide range of applications. Compared with the solid belly beam, in terms of bending resistance, the tension and compression sections are concentrated at the upper and lower ends, and the internal force arm is increased, so that with the same amount of material, greater bending strength is realized.

The above content reference: Encyclopedia - truss structure.

The advantages of trusses are:

Reliability: The design of the truss can ensure the correct installation of key components, providing high reliability assurance, and the frame can also support greater bearing capacity.

2.Flexibility: The modular form of the framework can make the system easier to expand and maintain, and in general, a new system can be rebuilt, or a new power cavity can be added in the form of modules to improve development efficiency.

3.Anti-interference: The parameter settings between the frame-mounted and the load-bearing modules can be anti-interference, and the system can also carry out more precise work.

4.Save development time: The system with frame design can save a lot of development time, and Wu Yuchun can save a lot of development time because the virtual belt of frame design can make the work more standardized, thereby saving a lot of development time.

Structural characteristics: the force of each member is mainly unidirectional tension and compression, and the bending moment and shear force distribution can be adapted to the internal structure through the reasonable arrangement of the upper and lower chords and web members. Because the internal force of the bucket bridge tension and compression in the horizontal direction realizes its own balance, the whole structure does not produce horizontal thrust on the bearing.

The structure layout is flexible and the application range is very wide. Compared with the solid belly beam (i.e., the beam we generally see), in terms of bending resistance, because the tension and compression sections are concentrated at the upper and lower ends, the internal force arm is increased, so that the number of states with the same amount of material to achieve greater bending strength.

In terms of shear resistance, the shear force can be gradually transmitted to the support through the reasonable arrangement of the web members. In this way, whether it is bending or shear resistance, the truss structure can give full play to the strength of the material, so that it can be suitable for building roof structures of various spans.

More importantly, it converts the complex stress state inside the solid web beam under the action of transverse bending into a simple tensile and compressive stress state in the truss member, so that we can intuitively understand the distribution and transmission of force, which is convenient for the change and combination of the structure.