El pandeo es un fenómeno de inestabilidad elástica que puede darse en elementos comprimidos esbeltos, y que se manifiesta por la aparición de desplazamientos importantes transversales a la dirección principal de compresión. En ingeniería estructural el fenómeno aparece principalmente en pilares y columnas, y se traduce en la aparición de una flexión adicional en el pilar cuando se halla sometido a la acción de esfuerzos axiales de cierta importancia.

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In science, buckling is a mathematical instability, leading to a failure mode. Buckling is characterized by a sudden sideways failure of a structural member subjected to high compressive stress, where the compressive stress at the point of failure is less than the ultimate compressive stress that the material is capable of withstanding. Mathematical analysis of buckling often makes use of an "artificial" axial load eccentricity that introduces a secondary bending moment that is not a part of the primary applied forces being studied. As an applied load is increased on a member, such as a column, it will ultimately become large enough to cause the member to become unstable and is said to have buckled. Further load will cause significant and somewhat unpredictable deformations, possibly leading to complete loss of the member's load-carrying capacity. If the deformations that follow buckling are not catastrophic the member will continue to carry the load that caused it to buckle. If the buckled member is part of a larger assemblage of components such as a building, any load applied to the structure beyond that which caused the member to buckle will be redistributed within the structure. Theoretically, buckling is caused by a bifurcation in the solution to the equations of static equilibrium. At a certain stage under an increasing load, further load is able to be sustained in one of two states of equilibrium: a purely compressed state (with no lateral deviation) or a laterally-deformed state.

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