Anton Tanasoglo
Numerical-Analytical Design Procedure of Solution the Stability Problem of Spatial Lattice Structures
Donbas National Academy of Civil Engineering and Architecture
Abstract. In the article the numerical-analytical design procedure of solution the stability problem of lattice diagonal elements of steel supports with one-bolted joints under complex stress state has been given. The general stability of the spatial lattice truss with inclined belts for the most common type of a lattice used in overhead power transmission lines’ (OPTL) supports, has been considered. The solution of the problem has been realized in the software package MS «Excel» using nonlinear mathematical device of finding the unknown parameters. The analysis of the received effective length coefficients of inclined braces of bottom section of the intermediate support 1P330-1 and corner dead-end support U220-2+9, has been carried out. Solving the stability equation an attention was paid to the joint work of structural components of the OPTL support trunk. Based on the developed design procedure we received new regularities of definition the longitudinal bending coefficients of lattice steel supports that increase the load-carrying capacity indicators of steel structures of overhead power transmission lines.
Keywords: stability, numerical-analytical design procedure, effective length, longitudinal bending coefficient, tower support, overhead power transmission line.
Igor Garanzha a, Salvador Ivorra-Chorro b
Review of Research in the Field Study of the Stress-Strain State of Concrete-Filled Structures
a Donbas National Academy of Civil Engineering and Architecture, b University of Alicante
Abstract. The paper presents an analytical review of the literature, which reflects the results of national and foreign scientific researches aimed to studying the features of the composition and dosage of components of self compacting concrete as one of the most promising aggregate for modern composite structures. In addition, the results of numerical and experimental researches of stress-strain state of composite structures (concrete-filled tubes) under the influence of various power factors, have been considered. The description and features of existing analytical methods for the determination of the bearing capacity of the considered structures under compression and bendings, have been given. The analysis of deformation model of confined concrete in a composition of the composite structure, as well as non-linear models of steel works with their distinctive features, has been carried out. The main approaches to the finite element modeling of composite structures have been determined.
Keywords: concrete-filled structures, self-compacting concrete, mineral supplements, bearing capacity, stress-strain state, central and eccentric compression, bending, finite-element model, numerical and experimental researches, nonlinear model of steel work, deformation model of confined concrete.
Yevgen Gorokhov, Volodymyr Vasylev, Andrey Alyokhin
Stress Testing Single-Circuit Angle-Tension Support Type U110-1
Donbas National Academy of Civil Engineering and Architecture
Abstract. The article presents the results of stress tests of single-circuit angle-tension-type metal support U110-1 voltage of 110 kV. The support is made of structural shapes (angle bar) steel VSt3 height 20.7 m, based on the butt 4.7 m and weight bearing without zinc coating 5 040 kg. Tests were carried out on ground tests of power lines and tower structures of Donbas National Academy of Civil Engineering and Architecture (on the DNASA Ground). The aim of the test was to determine the bearing capacity and deformability of the support in the main design modes and conformity assessment requirements support drawings KMD № 3078tm model project developed by NWD-T10 INSTITUTE «Energosetproject» (revision 1978). The tests were carried out on a support 4 of loading schemes that allow to check that the work supports U110-1 under static loads.
Keywords: tower testing station, static testing, overhead powerline suppotrs, the test procedure, angled sections, displacement, loading scheme.
Sergii Bakayev, Nataliia Smirnova, Vadim Morgay
Reliability Growth of Operation of Overhead Transmission Lines (Set of Works and Suggestion According to Acting OPL)
Donbas National Academy of Civil Engineering and Architecture
Abstract. The results of full-scale inspection of series of lines have been analyzed, suggestions according to powerful technique of defect and structural and units damage correction have been given. Taking into account constructional and operating features of research subject, the necessity of development of multilevel integrated security system has been found out. In the article circuit design of main phase of expert review of process safety orders has been given. References, which are needed to determine guarantee of processibillity and operating safety of overhead transmission lines in the process of civil engineering operation, and also in the process of maintenance and reconstruction have been given. Fundamental principles of engineering report, which are needed to determine representation of findings have been provided.
Keywords: supporting structures OPL, estimation of engineering status, measures according to growth of reliability and durability OPL, process safety control OPL.