Residual Operation Life of Buildings and Constructions

The article is devoted to problems of ensuring durability of steel concrete elements of buildings. It is shown that durability depends on their residual and service life. Normalizing of the latter is generalized, not sufficiently substantiated and non-regulatory. Computational techniques to assess the construction durability are not yet available. Actual and informative is determining the residual life of steel concrete structures. It was noted that the reason for the reduction in the carrying capacity of steel concrete structures and, accordingly, the residual life is corrosion damage of concrete and reinforcement due to an aggressive environment. This paper analyzes the modern methods of calculating residual life of flexural elements with corrosion, identifies their advantages and disadvantages in building inspection. The residual life should be determined on the basis of field surveys, when the maximum corrosion damage is found in various design sections. The physical and statistical approach is the most promising and acceptable for assessing and predicting the residual life of flexural steel concrete elements. The value of the residual life is proposed to be established with regard to reliability coefficient. Considering the ever increasing cases of early loss of bearing capacity of steel concrete structures due to corrosion damage, it is advisable to include mandatory requirements in construction design standards of calculating on a new ultimate limit state.

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Loading Optimization of the Metal Trusses

Yur’ev

Zin'kova

2020

Bulletin of Belgorod State Technological University Named After. V. G. Shukhov

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Loading optimization of the metal trusses has a variational basis. The universal criterion of optimization is the minimum of potential energy of the system (additional energy) in functional space expanded at the expense of functions fields of configuration and (or) material modules, and load. Under the condition of homogeneous linear elastic material optimal truss represents as quasiuniresistant virtual system with internal forces Ni/ⱷi (ⱷi – decrease coefficient of designed metal resistance of to tension and compression. The value ∑Nili (l is pivot length) is in general case the characteristic of the degree of a priori stability of truss, in special case (the load at the line, connecting supports) determines optimal variant of loading. As numerical experiment was consider the distribution of load ∑Fi=const for the truss with descending (ascending) pivot. It is established the independence of optimal loading variant from truss grating structure.

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Residual Operation Life of Buildings and Constructions

Cited by 9 publications

References 2 publications

Examination of the Safety of the Centrifuge Site of a Sugar Factory in the Belgorod Region in Order to Assess the Technical Condition of Structures

Examination of the Safety of the Centrifuge Site of a Sugar Factory in the Belgorod Region in Order to Assess the Technical Condition of Structures

Modern Approaches to Residual Life Calculation of Flexural Steel Concrete Elements With Corrosion Damage

Loading Optimization of the Metal Trusses

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