What Is Beam Buckling?
Structural buckling is the process by which a component loses its bearing capacity before it reaches yield.
Structural buckling
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- Chinese name
- Structural buckling
- Foreign name
- structural buckling
- Structural buckling is the process by which a component loses its bearing capacity before it reaches yield.
- buckling
- Structural loss of stability is called (structural) buckling or Euler buckling.
- L. Euler starts from a compressed ideal column hinged at both ends. The critical load of the strut is given. The so-called ideal column refers to an equal-section compression bar that is completely straight at the beginning and bears the center pressure. It is assumed that the column is completely elastic, and the stress does not exceed the proportional limit, the deformation is small and the flat cross-section is assumed. If the axial external load P is less than its critical value, the rod will remain straight and only undergo axial compression. If a disturbance (such as a lateral force) is applied to the rod to cause a small deflection, after the disturbance is removed. The deflection disappears, and the rod returns to the horizontal state. At this time, the elastic balance of the straight form of the rod is stable. If the axial external load P is greater than its critical value, the straight equilibrium state of the column becomes unstable, that is, the deflection caused by any disturbance will not only disappear after the disturbance is removed, but will continue to expand until it reaches a distance away from the upright state. Up to the new equilibrium position value, or bend. At this point, the plunger is said to be unstable or buckled (Eulerian buckling).
- Linear buckling: It is based on the theory of linear elasticity with small displacements and small strains. The analysis does not take into account the changes in the structure configuration of the structure during the loading and deformation process, that is, the initial configuration of the structure is always in the various stages of external force Establish a balance equation. When the load reaches a certain critical value, the structural configuration will suddenly jump to another random equilibrium state, which is called buckling. The critical point is called anterior buckling, and the critical point is called posterior buckling.
- Lateral torsional buckling: The cross section of the beam is generally made narrow and high, and the moments of inertia of the two major axes of the cross section are very different. If there is no lateral support in the middle of the beam span or the lateral support distance is large, when the lateral load or bending moment is applied in the main plane of maximum stiffness, the load is cut to a certain value, the beam section may have lateral displacement and torsion, resulting in loss of load Capacity, this phenomenon is called lateral torsional buckling of the beam, referred to as lateral torsional buckling.
- Elastic bending buckling of an ideal axially compressed straight rod: It is assumed that the torsion rod does not twist when it buckles, but only bends along the main axis. However, for open thin-walled section members, the phenomenon of loss of stability under torsional or torsional deformation under pressure may be called torsional buckling or torsional buckling.