How to pull the support in PKPM
Publish: 2021-05-01 04:17:32
1. Of course, there are more contents in epidemiology, infectious diseases and public health.
2. The default is basically OK. At most, adjust the slenderness ratio. Almost all instrial building supports are controlled by slenderness ratio. It is not recommended for high-rise steel structures.
3. it's too hard
4. Load input in PKPM
1. The load between beams in PKPM is generally the load generated by the wall on the beam
A: in the calculation, the volume weight of ordinary brick is 18 kn / m2 for the second and fourth walls (ordinary machine-made brick is generally used, which is 19 kn / m2), and the mortar layer is 17 kn / m2 (lime mortar, mixed mortar). In this way, the load generated by each square wall is: 19 times 0.24 + 17 times 0.02 times 2 = 5.24 kn / m2 (the plastering layer is generally 20 thick, double-sided mortar, which is multiplied by 2.)
finally, multiply 5.24 times the wall area on the beam to get the load on the beam
5.24 is a data that is used a lot. If you are familiar with it, you will know it. You can use it directly when calculating
2. When the building model is completed, the dead load and live load on the floor are input, and the load on the beam is input: what should the dead load on the beam include? What should live load include“ What is the purpose of "floor load conction calculation"
does the dead load on the beam include: main beam: dead weight of the beam + main beam under the heavy floor of self bearing wall on the beam: dead weight of the beam. Do you want to add the self weight of the secondary beam on the main beam, the self weight of the floor and the load on it? Does the dead load on the column only include the self weight of the section of the floor where it is located? Do you want to add the load above the floor? Is that right After the dead load and live load are arranged on the floor, only the self weight of the beam is considered when the load of the beam is arranged. Then all the loads on the beam are calculated in the load conction calculation
A: generally, as long as the dead load and live load on the floor are input, it should be noted that the dead load of the floor should include the dead weight of the floor (except for the automatic calculation of the dead weight of the floor)
the program will automatically transmit the floor load to the beam, so the dead weight of the infill wall on the beam is generally input as the dead load, and the dead weight of all beams
columns does not need to be input, so the program will automatically calculate. For columns, it is not necessary to input loads, and all loads transmitted from beams will be automatically calculated back to columns
the above is the general situation, so it is necessary to input the load according to the actual situation. For example, if there is no infilled wall on the beam, but there is a heavy equipment, the dead load of the beam is not input, but the live load on the beam should be input according to the actual force of the equipment. Another example is that the column is subjected to a horizontal force in the middle,
for example, if an awning diagonal rod is set to pull on the column, then the live load of the column must be input. Floor load conction calculation is to transfer the floor load to the beam, then the beam load to the column, and then the column load to the lowest floor, so as to prepare for the foundation calculation
3. What are the load between PKPM beams, uniform load and concentrated load? Where is the load
distributed load (uniform load)
continuous action on a large area of member surface can not be regarded as concentrated load, and any two loads with the same magnitude and direction are called uniformly distributed load
concentrated load is a concept corresponding to uniformly distributed load, and its action area is very small relative to the acted surface, The load that can be simplified as a point is the concentrated load
in PKPM, there may be uniform load between beams and walls. For example, in frame structure, between floor beams, partition walls should be built, and the location of partition walls can be found on a closed surface between columns and beams, which is simplified as uniform load evenly distributed on beams
the concentrated load depends on the specific situation. For example, if a small column is built on a certain beam, and the small column is not planned to be built in the model or the elevation is not on the floor, then the force on the column can be converted into a concentrated force and added to the corresponding action point of the beam or column
the loading position depends on the action position, where the load is applied ~
there is node load, which is not used in general, but for example, the sloping roof will have horizontal force on the beam, while the uniform load and concentrated load in PKPM are all added vertically, so the horizontal force must be applied with node load ~
4 PKPM masonry structure modeling
in the process of PM modeling, I subtract the window and door openings on the wall. Is it necessary to input the loads between beams and walls
best answer
when modeling masonry, the self weight of the wall will be automatically calculated by the program. In addition, you have to input all the loads yourself
5. What is the load between columns in PKPM
the load between columns is the load acting on the middle of columns. It depends on the actual situation. General frame structure is not, but to actual analysis, for example, you pick a bracket on the column, support something else, then you need to add the load between the columns. Or if your column is subjected to horizontal concentrated force at half the height, it should also be increased. That is to say, if there is a load, you will lose; if there is no load, you will not lose
there are live and dead loads on the column. The dead load is calculated automatically by program. The live load is generally transmitted from beams and slabs. Generally, the column load is not input. Generally need to calculate their own input is the beam dead load, the weight of the wall (infilled wall - frame structure), shear wall does not need. Then there is the live load on the plate. In LT, there are reserved openings, but the load needs to be input
6. Generally, as long as the dead load and live load on the floor are input, it should be noted that the dead load of the floor should include the dead weight of the floor (except for the automatic calculation of the dead weight of the floor). The program will automatically transmit the floor load to the beam, so the dead weight of the infill wall on the beam is generally input as the dead load, and the dead weight of all beams and columns does not need to be input, so the program will automatically calculate. For columns, it is not necessary to input loads, and all loads transmitted from beams will be automatically calculated back to columns.
1. The load between beams in PKPM is generally the load generated by the wall on the beam
A: in the calculation, the volume weight of ordinary brick is 18 kn / m2 for the second and fourth walls (ordinary machine-made brick is generally used, which is 19 kn / m2), and the mortar layer is 17 kn / m2 (lime mortar, mixed mortar). In this way, the load generated by each square wall is: 19 times 0.24 + 17 times 0.02 times 2 = 5.24 kn / m2 (the plastering layer is generally 20 thick, double-sided mortar, which is multiplied by 2.)
finally, multiply 5.24 times the wall area on the beam to get the load on the beam
5.24 is a data that is used a lot. If you are familiar with it, you will know it. You can use it directly when calculating
2. When the building model is completed, the dead load and live load on the floor are input, and the load on the beam is input: what should the dead load on the beam include? What should live load include“ What is the purpose of "floor load conction calculation"
does the dead load on the beam include: main beam: dead weight of the beam + main beam under the heavy floor of self bearing wall on the beam: dead weight of the beam. Do you want to add the self weight of the secondary beam on the main beam, the self weight of the floor and the load on it? Does the dead load on the column only include the self weight of the section of the floor where it is located? Do you want to add the load above the floor? Is that right After the dead load and live load are arranged on the floor, only the self weight of the beam is considered when the load of the beam is arranged. Then all the loads on the beam are calculated in the load conction calculation
A: generally, as long as the dead load and live load on the floor are input, it should be noted that the dead load of the floor should include the dead weight of the floor (except for the automatic calculation of the dead weight of the floor)
the program will automatically transmit the floor load to the beam, so the dead weight of the infill wall on the beam is generally input as the dead load, and the dead weight of all beams
columns does not need to be input, so the program will automatically calculate. For columns, it is not necessary to input loads, and all loads transmitted from beams will be automatically calculated back to columns
the above is the general situation, so it is necessary to input the load according to the actual situation. For example, if there is no infilled wall on the beam, but there is a heavy equipment, the dead load of the beam is not input, but the live load on the beam should be input according to the actual force of the equipment. Another example is that the column is subjected to a horizontal force in the middle,
for example, if an awning diagonal rod is set to pull on the column, then the live load of the column must be input. Floor load conction calculation is to transfer the floor load to the beam, then the beam load to the column, and then the column load to the lowest floor, so as to prepare for the foundation calculation
3. What are the load between PKPM beams, uniform load and concentrated load? Where is the load
distributed load (uniform load)
continuous action on a large area of member surface can not be regarded as concentrated load, and any two loads with the same magnitude and direction are called uniformly distributed load
concentrated load is a concept corresponding to uniformly distributed load, and its action area is very small relative to the acted surface, The load that can be simplified as a point is the concentrated load
in PKPM, there may be uniform load between beams and walls. For example, in frame structure, between floor beams, partition walls should be built, and the location of partition walls can be found on a closed surface between columns and beams, which is simplified as uniform load evenly distributed on beams
the concentrated load depends on the specific situation. For example, if a small column is built on a certain beam, and the small column is not planned to be built in the model or the elevation is not on the floor, then the force on the column can be converted into a concentrated force and added to the corresponding action point of the beam or column
the loading position depends on the action position, where the load is applied ~
there is node load, which is not used in general, but for example, the sloping roof will have horizontal force on the beam, while the uniform load and concentrated load in PKPM are all added vertically, so the horizontal force must be applied with node load ~
4 PKPM masonry structure modeling
in the process of PM modeling, I subtract the window and door openings on the wall. Is it necessary to input the loads between beams and walls
best answer
when modeling masonry, the self weight of the wall will be automatically calculated by the program. In addition, you have to input all the loads yourself
5. What is the load between columns in PKPM
the load between columns is the load acting on the middle of columns. It depends on the actual situation. General frame structure is not, but to actual analysis, for example, you pick a bracket on the column, support something else, then you need to add the load between the columns. Or if your column is subjected to horizontal concentrated force at half the height, it should also be increased. That is to say, if there is a load, you will lose; if there is no load, you will not lose
there are live and dead loads on the column. The dead load is calculated automatically by program. The live load is generally transmitted from beams and slabs. Generally, the column load is not input. Generally need to calculate their own input is the beam dead load, the weight of the wall (infilled wall - frame structure), shear wall does not need. Then there is the live load on the plate. In LT, there are reserved openings, but the load needs to be input
6. Generally, as long as the dead load and live load on the floor are input, it should be noted that the dead load of the floor should include the dead weight of the floor (except for the automatic calculation of the dead weight of the floor). The program will automatically transmit the floor load to the beam, so the dead weight of the infill wall on the beam is generally input as the dead load, and the dead weight of all beams and columns does not need to be input, so the program will automatically calculate. For columns, it is not necessary to input loads, and all loads transmitted from beams will be automatically calculated back to columns.
5. I'm not talking about columns, but mainly inclined supports.
6. [structural designer]
the frame that meets the requirements of 5.3.3-1 of code for design of steel structures (GB 50017-2003) is non sway frame
in other words, instead of adding lateral support, lateral support makes the overall lateral stiffness of the structure large enough, and the judgment method is complex. In order to achieve no lateral displacement, it is wrong to deliberately increase the lateral support
it's like putting a pillar every other meter in the house for safety. It's safe, but it costs money and affects the practicality
give up. Unless your frame itself has elevator shaft and other shear walls, that is, frame shear wall structure.
the frame that meets the requirements of 5.3.3-1 of code for design of steel structures (GB 50017-2003) is non sway frame
in other words, instead of adding lateral support, lateral support makes the overall lateral stiffness of the structure large enough, and the judgment method is complex. In order to achieve no lateral displacement, it is wrong to deliberately increase the lateral support
it's like putting a pillar every other meter in the house for safety. It's safe, but it costs money and affects the practicality
give up. Unless your frame itself has elevator shaft and other shear walls, that is, frame shear wall structure.
7.
1. PKPM series software has a mole called STS, which is suitable for the calculation of various light steel roof truss, such as steel structure workshop, structure, equipment tower, etc
Another mole about steel structure in PKPM series is called stpj; It is applicable to the calculation of heavy-ty steel structure workshop, which is less used The mole of PKPM is called msgs, which can calculate all kinds of grid structures. PKPM series directly related to the steel structure of the threeaccording to the size shown in the design drawing, it is calculated by the weight of steel, not decting the weight of hole, trimming and cutting limb, and the weight of welding rod, rivet and bolt is not increased. Irregular or polygonal steel plate is calculated according to its external regular rectangular area. The steel grid structure should be distinguished from spherical joint, steel plate joint and other connection forms
steel is characterized by high strength, light weight, good overall stiffness and strong resistance to deformation, so it is particularly suitable for building large span, super high and super heavy buildings; The material is an ideal elastic body with good homogeneity and isotropy, which is most consistent with the basic assumption of general engineering mechanics
the material has good plasticity and toughness, can have large deformation, and can bear dynamic load well; The construction period is short; It has a high degree of instrialization and can carry out specialized proction with high degree of mechanization
extended data
1. Steel truss connection method
steel truss can be welded, ordinary bolt connection, high strength bolt connection or riveting. Welding is the most widely used; Common bolted connections are commonly used in detachable structures, transmission towers and support systems; High strength bolt connection is often used in the construction site connection of heavy steel truss; Riveting is used for heavy steel truss under large dynamic load, which has been graally replaced by high-strength bolt connection
The height of steel truss is determined by economy, rigidity, use and transportation requirements. Increasing the height can rece the chord section and deflection, but increase the amount of web members and building height. The height span ratio of steel truss is usually 1 / 5 ~ 1 / 12; The steel truss with high steel strength and strict rigidity requirements should adopt relatively high value. The height of triangular steel roof truss is usually determined by the height of roof slope; When the general roof slope is 1 / 2 ~ 1 / 3, the height span ratio is 1 / 4 ~ 1 / 6 The web member system of steel truss usually adopts herringbone type or monoclinic type. The number of web members and nodes of herringbone web members is less, so it is widely used; In order to rece the section size of loaded chord or compression chord, some vertical members are usually added. Single diagonal web members are usually arranged so that the longer diagonal members are in tension and the shorter vertical members are in compression. Sometimes they are used in steel trusses with larger span In order to further rece the length of chord and web members, subdivided web member system can be used, and K-type or rhombic web member system can be used when the height of steel truss is large and the section is small. In support trusses and towers, the crossed web member system is often used, which can better bear the variable direction load. The inclination angle of diagonal web member to chord is usually 30 °8. According to the truss calculation, I find the reference books to calculate the load. The calculation content is not clear in a few words
9. Slenderness ratio is an attribute of the support itself, which cannot be adjusted
if you adjust it, you can adjust the connection at both ends of the support, such as changing the connection to rigid connection.
in fact, it is to rece the calculation length
it is not feasible to rece the calculation length directly, because there is no other component supporting it
you can change the section size of the support to increase the radius of gyration, or you can change it to other forms to increase the radius of gyration
I hope I can help you.
if you adjust it, you can adjust the connection at both ends of the support, such as changing the connection to rigid connection.
in fact, it is to rece the calculation length
it is not feasible to rece the calculation length directly, because there is no other component supporting it
you can change the section size of the support to increase the radius of gyration, or you can change it to other forms to increase the radius of gyration
I hope I can help you.
10. No, it hasn't been published on the official website for the time being
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