How to calculate the axial force at the top of column under vert
Publish: 2021-04-22 23:35:15
1. The axial force at the bottom of the column is the axial force at the top of the column plus the self weight of the column itself, which is only considered when calculating the vertical dead load. When calculating the live load, the axial force at the top and bottom of the column take the same value.
2. The vertical force acts on the column directly, and its axial force is the vertical pressure. The bearing capacity (i.e. normal pressure) and the pressure stability calculation of the column should be calculated. All must meet the design requirements.
3. The axial force at the upper end of each column is obtained by adding the shear force at the end of the transverse frame beam, the reaction force at the end of the longitudinal frame beam (calculated according to the simply supported beam) and the axial force from the upper column; The axial force at the lower end of each column is the axial force at the upper end plus the self weight of the column
vertical load is the gravity of various structural members and attachments perpendicular to the ground.
vertical load is the gravity of various structural members and attachments perpendicular to the ground.
4. The internal force of frame structure under vertical load can be approximately calculated by the layered method
in the internal force analysis under vertical load, it can be assumed that: (1) the vertical load acting on the frame beam of one floor has no effect on the frame beam of other floors, but only the frame beam of this floor and the frame column connected with the frame beam of this floor proce bending moment and shear force 2) Under the vertical load, the lateral displacement of the frame is not considered< The calculation process can be as follows:
(1) delamination: the upper and lower ends of the columns of the layered frame are assumed to be fixed end supports,
(2) calculation of each independent rigid frame element: the moment distribution method or iterative method is used to calculate each independent rigid frame element.. The internal force of each layer of beam calculated by layer is the internal force of the corresponding layer of beam in the original frame structure
(3) superposition: after obtaining the structural internal forces of each independent rigid frame, the internal forces of columns with the same floor and column number in two adjacent independent rigid frames can be superimposed as the internal forces of columns in the original frame structure
the superimposed bending moment diagram is the approximate bending moment diagram of the original frame. Because the bending moment at the column joint of the frame is the sum of the upper and lower layers of the column, the superimposed bending moment diagram is often unbalanced at the frame joint. This is e to the error caused by the difference between the layered computing unit and the actual structure. In order to improve the accuracy, the unbalanced bending moment of the joints, especially the side joints, can be redistributed and corrected.
in the internal force analysis under vertical load, it can be assumed that: (1) the vertical load acting on the frame beam of one floor has no effect on the frame beam of other floors, but only the frame beam of this floor and the frame column connected with the frame beam of this floor proce bending moment and shear force 2) Under the vertical load, the lateral displacement of the frame is not considered< The calculation process can be as follows:
(1) delamination: the upper and lower ends of the columns of the layered frame are assumed to be fixed end supports,
(2) calculation of each independent rigid frame element: the moment distribution method or iterative method is used to calculate each independent rigid frame element.. The internal force of each layer of beam calculated by layer is the internal force of the corresponding layer of beam in the original frame structure
(3) superposition: after obtaining the structural internal forces of each independent rigid frame, the internal forces of columns with the same floor and column number in two adjacent independent rigid frames can be superimposed as the internal forces of columns in the original frame structure
the superimposed bending moment diagram is the approximate bending moment diagram of the original frame. Because the bending moment at the column joint of the frame is the sum of the upper and lower layers of the column, the superimposed bending moment diagram is often unbalanced at the frame joint. This is e to the error caused by the difference between the layered computing unit and the actual structure. In order to improve the accuracy, the unbalanced bending moment of the joints, especially the side joints, can be redistributed and corrected.
5. The internal force of frame structure under vertical load can be approximately calculated by the layered method
in the internal force analysis under the vertical load, it can be assumed that: (1) the vertical load acting on the frame beam of one floor has no effect on the frame beam of other floors, but only proces bending moment and shear force in the frame beam of this floor and the frame column connected with the frame beam of this floor
(2) under the vertical load, the lateral displacement of the frame is not considered< The calculation process can be as follows:
(1) delamination: the upper and lower ends of the columns of the layered frame are assumed to be fixed end supports,
(2) calculation of each independent rigid frame element: the moment distribution method or iterative method is used to calculate each independent rigid frame element.. The internal force of each layer of beam calculated by layer is the internal force of the corresponding layer of beam in the original frame structure
(3) superposition: after obtaining the structural internal forces of each independent rigid frame, the internal forces of columns with the same floor and column number in two adjacent independent rigid frames can be superimposed as the internal forces of columns in the original frame structure
the superimposed bending moment diagram is the approximate bending moment diagram of the original frame. Because the bending moment at the column joint of the frame is the sum of the upper and lower layers of the column, the superimposed bending moment diagram is often unbalanced at the frame joint. This is e to the error caused by the difference between the layered computing unit and the actual structure. In order to improve the accuracy, the unbalanced bending moment of the joints, especially the side joints, can be redistributed and corrected.
in the internal force analysis under the vertical load, it can be assumed that: (1) the vertical load acting on the frame beam of one floor has no effect on the frame beam of other floors, but only proces bending moment and shear force in the frame beam of this floor and the frame column connected with the frame beam of this floor
(2) under the vertical load, the lateral displacement of the frame is not considered< The calculation process can be as follows:
(1) delamination: the upper and lower ends of the columns of the layered frame are assumed to be fixed end supports,
(2) calculation of each independent rigid frame element: the moment distribution method or iterative method is used to calculate each independent rigid frame element.. The internal force of each layer of beam calculated by layer is the internal force of the corresponding layer of beam in the original frame structure
(3) superposition: after obtaining the structural internal forces of each independent rigid frame, the internal forces of columns with the same floor and column number in two adjacent independent rigid frames can be superimposed as the internal forces of columns in the original frame structure
the superimposed bending moment diagram is the approximate bending moment diagram of the original frame. Because the bending moment at the column joint of the frame is the sum of the upper and lower layers of the column, the superimposed bending moment diagram is often unbalanced at the frame joint. This is e to the error caused by the difference between the layered computing unit and the actual structure. In order to improve the accuracy, the unbalanced bending moment of the joints, especially the side joints, can be redistributed and corrected.
6. Calculation by force method
calculation by deformation method
calculation by moment distribution method
calculation by iteration method
calculation by approximate method (layering method)
1) layering: upper and lower ends of columns in layered frame are assumed to be fixed end supports,
(2) calculation of indivial rigid frame elements: Calculation of indivial rigid frame elements by moment distribution method or iteration method.. The internal force of each layer of beam calculated by layer is the internal force of the corresponding layer of beam in the original frame structure
(3) superposition: after obtaining the structural internal forces of each independent rigid frame, the internal forces of columns with the same floor and column number in two adjacent independent rigid frames can be superimposed as the internal forces of columns in the original frame structure
the superimposed bending moment diagram is the approximate bending moment diagram of the original frame. Because the bending moment at the column joint of the frame is the sum of the upper and lower layers of the column, the superimposed bending moment diagram is often unbalanced at the frame joint. This is e to the error caused by the difference between the layered computing unit and the actual structure. In order to improve the accuracy, the unbalanced bending moment of the joints, especially the side joints, can be redistributed and corrected.
calculation by deformation method
calculation by moment distribution method
calculation by iteration method
calculation by approximate method (layering method)
1) layering: upper and lower ends of columns in layered frame are assumed to be fixed end supports,
(2) calculation of indivial rigid frame elements: Calculation of indivial rigid frame elements by moment distribution method or iteration method.. The internal force of each layer of beam calculated by layer is the internal force of the corresponding layer of beam in the original frame structure
(3) superposition: after obtaining the structural internal forces of each independent rigid frame, the internal forces of columns with the same floor and column number in two adjacent independent rigid frames can be superimposed as the internal forces of columns in the original frame structure
the superimposed bending moment diagram is the approximate bending moment diagram of the original frame. Because the bending moment at the column joint of the frame is the sum of the upper and lower layers of the column, the superimposed bending moment diagram is often unbalanced at the frame joint. This is e to the error caused by the difference between the layered computing unit and the actual structure. In order to improve the accuracy, the unbalanced bending moment of the joints, especially the side joints, can be redistributed and corrected.
7. Force transfer process: the plate is transferred to the secondary beam, the secondary beam is transferred to the main beam, and the main beam is transferred to the column
the short side of two-way slab is triangle, the long side is trapezoid, and the one-way slab is transferred according to the long side. After drawing the force transfer of slab, the analysis shows that if the concentrated load = slab weight, longitudinal wall weight (decting window weight), window weight and longitudinal beam weight. Hope to help you.
the short side of two-way slab is triangle, the long side is trapezoid, and the one-way slab is transferred according to the long side. After drawing the force transfer of slab, the analysis shows that if the concentrated load = slab weight, longitudinal wall weight (decting window weight), window weight and longitudinal beam weight. Hope to help you.
8. What's the value of the question
given the vertical load of the column, the vertical load includes the standard value of the permanent load and the standard value of the variable load, which is derived from the basic combination or standard combination. Under the action of load, each section of the column will have an effect (that is, internal force). How does the "standard value" come out under the action of load?
given the vertical load of the column, the vertical load includes the standard value of the permanent load and the standard value of the variable load, which is derived from the basic combination or standard combination. Under the action of load, each section of the column will have an effect (that is, internal force). How does the "standard value" come out under the action of load?
9. How to calculate the axial force of the frame column and the shear force at the beam end under the left wind load,
the wind load is applied by the horizontal concentrated force at the top of the column in the internal force analysis of the structure. It will not proce axial force of frame column and shear force of beam end.
the wind load is applied by the horizontal concentrated force at the top of the column in the internal force analysis of the structure. It will not proce axial force of frame column and shear force of beam end.
10. The calculation method of internal force of frame under horizontal load is reverse bending point method and D value method; The lateral stiffness of the column is determined; The distribution of shear force of each column; Calculation of bending moment at column end; Calculation of bending moment at beam end; Calculation of shear force of beam. Calculation of lateral displacement under horizontal load: it can be considered as the superposition of lateral displacement caused by bending deformation of beam and column and axial deformation of column
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