Andrey Mironov, Kirill Parasyuk
Determination of the Pulsation Component of the Main wind Load for a 17-Storey Building with a Frame Frame in the Lira-CAD 2016 PC, Taking into Account SP 20.13330.2016 «Loads and Impacts»
Donbas National Academy of Civil Engineering and Architecture
Abstract. This article investigates the possibility and correctness of automated collection of the pulsation component of the wind load in the Lira-CAD PC, due to the importance of correctly accounting for the wind load with an increase in the height of the projected building, which is due to a significant increase in wind pressure due to a decrease in friction on the ground surface. Also, with an increase in the height of the building, the influence of wind load on the cross-sections of elements, in particular load-bearing columns, increases, and the correct accounting of the main wind load, consisting of medium (static) and pulsation (dynamic) components, significantly affects the reliability and efficiency of building structures. The article considers the collection of the average component of the main wind load manually, and automated accounting of the pulsating component of the wind load using the Lira-CAD 2016 PC, using the example of a 17-storey residential building. The correctness of accounting for the required natural oscillation frequencies by the software package is analyzed, the method of accounting for oscillation frequencies in the calculated combination of loads (RSN) is determined. The compliance of the algorithm for calculating the software package with the current regulatory documents (SP 20.133330.2016 «Loads and impacts») was revealed.
Keywords: pulsation component, wind load, frame-link frame, multi-storey buildings.
Vladimir Vasylev, Andrey Tymoshko, Sergey Titkov, Alexander Avksentiev
On the Issue of Designing of Metal Columns Bases with a Milled end Face
Donbas National Academy of Civil Engineering and Architecture
Abstract. The issue of designing and, in particular, calculating the thickness of the base plate in the metal columns bases with a milled end face for non-check mounting is considered in the article. The main historical stages of the development of the bases of columns with a milled end are briefly highlighted, the factors that influenced the containment of their development are indicated. An example of the first known use of columns with a milled end face in history is given in the article. The analysis of literary sources, including normative ones, was carried out in order to study the existing calculation methods, their development, identify their shortcomings and formulate the main research problem. The current method of calculating the thickness of the base plate in column bases with a milled end is shown. Based on the performed research, conclusions and recommendations are given.
Keywords: metal columns, base plate, milling, non-check installation, thickness calculation, bending moment, tension.
Yevgen Gorokhov, Natalia Smirnova, Helen Shelikhova
Control System for Reconstruction of Overhead Line Supports Taking into Account the Requirements of Operation and Reliability of Power Supply to Consumers
Donbas National Academy of Civil Engineering and Architecture
Abstract. Modern problems related to the organization of technical supervision of the state of power grid facilities, certification of facilities and quality management of operation of high-voltage lines (overhead lines) in order to optimize the costs of ensuring trouble–free operation are considered. One of the proposed mechanisms to achieve this goal is line insurance based on technical condition monitoring, which helps to reduce the financial burden on line owners and operating organizations. The stages of examination of technological safety requirements are highlighted, which makes it possible to ensure the safety of overhead line operation. The introduction of insurance liability based on the modeling of repair and restoration measures justifies the economic efficiency of ensuring safety during the operation of overhead lines. Thus, the approaches to improving the organization of technical supervision, certification and quality management of overhead line operation using the insurance mechanism are presented. This reduces the financial burden and increases safety, which is a cost-effective approach to ensuring trouble-free operation of power grid facilities.
Keywords: high-voltage lines (overhead lines), technical supervision, certification, quality management of operation, monitoring of technical condition, insurance of lines.
Vladimir Mushchanov, Anatoly Orzhehovsky, Margarita Kashchenko, Anna Zubenko
Reliability of Spatial Core Structures of Truncated Large-Span Domes
Donbas National Academy of Civil Engineering and Architecture
Abstract. The article considers a critical analysis of methods for ensuring the reliability and survivability of spatial rod metal structures in combination with the requirements for preventing avalanche collapse. The review of accidents of constructive form in the form of dome structures is carried out, and some scientific works on ensuring their reliability are analyzed. The main provisions of Russian and foreign norms are considered, which indicate insufficient elaboration of the issue of calculation for progressive collapse for this constructive form. An approach is proposed to implement a comprehensive assessment of reliability and survivability using the author’s software package, which has been tested and has proven itself positively in a number of scientific studies conducted for other structural forms in the form of spatial rod metal structures. Based on the performed critical analysis, significant variable design parameters were identified for the studied structural form. A plan was developed for conducting a numerical experiment to clarify their influence on the features of the stress-strain state, assessing the propensity of the studied structural scheme to possible avalanche-like destruction and the value of the integral indicator of the reliability of the design solution.facilities.
Keywords: large-span domes, reliability, survivability, avalanche-like collapse, key elements, probability of failure.