A bar model of a temporary wooden support used to remove deflections of buildings

The deflection of buildings located in mining areas is removed by uneven raising of the overground part of the structure by means of supports consisting of a hydraulic piston jack and a stack of underpinning elements. Temporary supports may also consist of stacks of wooden elements only. The article presents a bar model of a temporary support consisting of a stack of elements. The model, which is described by a differential, second-order equation, allows to determine horizontal displacements. It was demonstrated that the unintended eccentricity and the initial curvature of the element have influence on such displacements. In addition, the effect of the load transmitted by the deformed adjacent supports is important. The model presented can be used to determine the limit load capacity of temporary supports due to unintended horizontal displacements of the structure. The model therefore allows to design safely the removal of building structures' deflections.