Analysis of the advantages and disadvantages of normative methods for calculating excavated special fortifications

Introduction. In order to maintain and restore existing excavated fortification special structures in the state corresponding to combat missions, timely reconstruction and overhaul work is necessary. To select the optimal option for the restoration of such structures, it is necessary to carry out verification calculations of building structures, check the compliance of excavated special fortifications with the required protection class. However, these calculations are performed on the basis of methods based on fundamental solutions developed back in the 80-90s of the last century. At present, the calculation software systems, methods and methods for conducting a survey of the technical condition of load-bearing structures have changed, new technologies, devices and devices, new building materials, etc. have appeared. Targets and goals. Тo study the applied methods for calculating excavated special fortifications. Perform a thorough analysis of existing methods, in order to identify their advantages and disadvantages. Methods. In the process of work, various scientific and methodological sources, departmental regulatory documentation related to the issue of assessing the degree of protection of excavated special fortifications were analyzed. Results and its discussion. It has been established that all the applied calculation methods are used in the design of newly erected fortifications and take into account the normative state of the supporting structures. Their use in the reconstruction of special fortifications is incorrect and leads to significant errors in the results obtained. Conclusion. As a result of the study, it was determined that the increased deformability of the frame structure leads to the need to improve the calculation methods by considering spatial design schemes. To understand the full picture of the operation of load-bearing structures, taking into account defects and damage, it is necessary to consider the behavior of load-bearing structures of KSFS under repeated impacts. Keywords: excavated special fortifications, reconstruction, calculation method, finite element method, finite difference method, characteristic method and boundary element method.