Abstract
Abstract Yielding support, commonly applied to secure dog headings, is made of carrying elements in the form of steel frames and friction props. Yielding capacity of this support is realized in frictional joints, which due to their geometry can be divided to straight and arch joints. Occurring in steel frames arch frictional joints are characterized with more complex loading state than straight joints used in friction props. In the article, there is presented an analysis of the state of stress and deformation of the arch frictional joint, which was carried out on the model of these joints using finite element method. The scope of the analysis included two methods of loading of arch frictional joint, namely its axial compression and bending. In both cases, joints were loaded dynamically with the impact of freely falling mass. Arch joints with and without passive pressure were submitted to an axial compression. Physical model of the frictional joint was developed on the basis of a system applied during the stand tests. To solve mathematical model an explicit integration method was used. As a result of analyses carried out, temporal courses of force transmitted through the frictional joint, and displacements of section sliding down were determined. On the basis of the temporal courses, dependences between maximum value of force transmitted through the frictional joint and the height from which the impact mass falls down were determined. Distributions of reduced stresses in elements of frictional joint were also determined and the state of deformation was described. In order to emphasize the difference between straight and arch frictional joints, also an analysis of internal forces in arch frictional joint depending on its geometrical parameters without and with passive pressure was presented.
Highlights
In yielding support of dog headings, there are two types of frictional joints, namely: straight and arched
In the case when the joint is made of rectilinear sections of the profile, we are dealing with a straight joint, which is used mainly in the friction props
In order to determine the influence of passive pressure on distributions and maximum values of bending moment and transverse force operating on arch frictional joint, the calculations for arch frictional joints with and without passive pressure were performed
Summary
In yielding support of dog headings, there are two types of frictional joints, namely: straight and arched. Despite many advantages have other limitations regarding mainly range of changes in parameters describing the frictional joint and the way of its loading These tests unable determination of distributions of stresses and deformations of particular elements of frictional joint during its operation. Taking into account the specificity of operation of arch frictional joint, and difficulties with its stand and underground tests, in the present paper an analysis of operation of this joint, using the finite element method was performed [3], [8] This analysis included the case of dynamic loading of a joint resulting from the action of freely falling impact mass. Studies presented in this paper included two cases of loading of arch frictional joint, namely its axial compression and bending
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