The article discusses the issue of sustainable development of the regional settlement system and its elements (municipalities). The authors proposed the principles of territorial planning of the regional system of settlement and classification of the urban conflicts of motivations. Developed a theoretical model of sustainable development of regional systems of settlement, including the examination of particular characteristics of the territory, the definition of "code" identity of the territory, its adaptive development over time, identifying areas of conflict motivations and their solution in solving problems of territorial planning.

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The article deals with topical issues of the normative methodology for calculating bending and eccentrically compressed reinforced concrete elements along normal sections. They are based on the joint use of a nonlinear deformation model, the hypothesis of flat sections, physically and geometrically linear diagrams of the mechanical state of reinforcing steels of various strengths under force tension. Attention is drawn to the significant inaccuracies of calculations when using the approximate rectilinear steel deformation modulus of constant value E = 2 105 MPa up to the steel's ultimate strength. The high degree of complexity of manual calculation is confirmed when using the actual values of the physically nonlinear steel deformation modulus, approximated by analytical dependences of high degrees. A new author's approach is presented for solving such problems by approximating the real nonlinear strain modulus to the secant strain modulus E's with simple equations for high-strength “hard” and “soft” (not high and medium strength) steels, which allows to manually calculate such problems with greater accuracy.

The necessity of establishing and determining the consistency of mortars deformation in the horizontal joints of masonry is established: in the absence and development of cracks and with the exhaustion of resistance ranging from 80 – 85 % of the total deformation of masonry under short-term compression. Attention is paid to the absence of reports in the scientific literature on the conduct and results of research on the spatial stress-deformative state of the mortar in the joints of masonry under compression. The advantages of studying the secant modulus of deformation Ep are emphasized in solving various issues in the theory of operation and method for calculating the masonry. On the basis of long-term research results, the essential difference between the change in the secant modulus of cement mortars deformation E'p of varying strength of horizontal joints from the nature of its change when tested in standard samples is shown analytically and graphically. The advantages of the developed methodology for processing the results of investigations of mortars in standard samples are noted. It allows to more accurately set the actual values of normal strain modulus E0 and the ultimate relative deformation under compression. The analytical dependences of the plasticity coefficient and the secant modulus of deformations E'p are found based on processing the results of numerous studies of masonry mortars