The Study of the Stability of a Statically Indeterminate Double-Span Frame Made of Timber, Considering the Degrading Conditions of Support

The object is to study the operability of the frame-rod system in case of sudden loss of stability of one of the racks. As a subject, a frame-rod structure made of timber is considered, when loaded, a degrading destruction of the middle rack occurs. A special place in this area is occupied by the problems of studying the stability of the equilibrium of objects, since very often the process of loss of stability develops almost at lightning speed and makes it impossible to evacuate people and take measures to prevent destruction. A critical analysis of the current state of the problem of stability of core structures made of timber is carried out, the criteria for the stability of statically indeterminate structural systems made of timber are determined. An experimental plan was developed, the framework under study was designed and tested. Based on the experimental data obtained, graphs of clock-type sensor readings were constructed, showing the dependence of the deformations of the frame racks on the load applied to the frame, as well as the behavior of deformations during the destruction of the support at a load close to critical. The analysis of experimental data with the determination of the value of dynamic load coefficients is carried out. A calculation algorithm was derived to determine the nature of the destruction of structural system elements and to evaluate the operation of the structure in extreme conditions. The stability criteria can show the condition of the building depending on the indicator of the coefficients of dynamic loads.