# Several mechanics concepts

Source: Internet
Author: User

Simply supported Beam

Simply supported beam is the support structure of the two ends only providing vertical restraint, but not the corner restraint. Simply supported beam at both ends of the hinge bearing constraints, mainly under the positive bending moment, generally static structure.

Only the two ends are supported on the pillars of the beam, mainly under the positive bending moment, generally static structure. The system temperature change, concrete shrinkage and creep, tension prestress, bearing movement and so on will not produce additional internal forces in the beam, the force is simple, simply supported beam as a simplified model of mechanics.

Simply supported beams are just one of the simplified models of beams, as well as cantilever beams. The cantilever beam is fixed at one end and the other end unconstrained.

The extension beam is extended by extending the simply supported beam and crossing the fulcrum.

Shearing force

Shear (Shear force) is a parallel force that acts on the same object at a distance of two (but not 0), equal in size and opposite in direction. For example, scissors to cut an object, the object is subjected to the two scissors the force of the mouth is the shear force. or an internal force produced by an object due to its physical properties in order to restore the deformation caused by the moment. coupling: Consisting of a pair of parallel forces of equal size and opposite direction, but not collinear, it can no longer be simplified and is a basic force system. notation: ((f,f ') Coupling MomentThe short name is "the moment of a couple", also known as "the torque of a couple". A couple is a two equal parallel force whose resultant torque equals the product of the distance (called the coupling arm) between a force and a parallel force in the parallel force, which is called the "torque Moment", which is independent of the position of the rotation axis. Bending Momentis a kind of internal force moment on the section of the force member, that is, the resultant force moment of the internal forces system perpendicular to the cross-section. Its size is the part of the section interception of all external forces on the section of the core moment of the algebra and the positive and negative agreement is the member under the convex positive, the upper convex negative (positive and negative distinction standard is the member of the upper pressure is positive, the lower pressure is negative, the upper part of the tensile is negative, the lower part is pulled positive) For example, a cantilever beam, when the Liang Duanli is 2kN, Liang Changsheng 3m, just fixed end bending moment is -6kn.m, and the beam's cross-medium bending moment is -3kn.m http://course.cau-edu.net.cn/course/Z0125/ch03/se02/slide/ Slide01.htmlhttp://baike.baidu.com/link?url= Nwzsrnhiwmkqmuc6fz2r8fju62j-qs2hamhtu7s31ftxgcoh3ll4lvklivuwh8rw2ukv8xpjosw_itgnkhr7i_

Several mechanics concepts

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