Associate Professor, Transport Construction and Property Management
National Transport University
Victoriia Khrutba, Anna Kharchenko, Yuliia Khrutba, Mykola Kolbasin, Vitalii Tsybulskyi, Iuliia Silantieva, and Roksolana Lysak Private Company Technology Center
The object of research considered in this paper is the design mindset process in the development of a prototype of electronic service for assessing the environmental impact of the planned activities of business entities. The problems of applying the design mindset approach to the process of automating environmental impact assessment have been investigated. As a result of the application of the design mindset in combination with the stakeholder approach, a logical-structural scheme and architecture of the electronic service interface for different categories of users have been developed. The peculiarities of the prototype of the electronic service of environmental impact assessment (EIA ES) are to provide a common understanding of the requirements and results obtained, and convenient access to the execution of calculations. Distinctive features for the implementation of calculations in EIA ES are the quantitative obtaining of the values of indicators, which are represented by a report in the form of qualitative parameters through the use of a new algorithm. This allows business entities to perform calculations of indicators using online access at the stage of preparing the report. The developed interface design and functionality of the EIA prototype were evaluated by the expert method on a 10-point scale when making calculations for a real project. The effectiveness of the electronic service has been confirmed by the consistency of expert opinions in line with the concordation method. The estimated concordation coefficient was 0.83 and was checked for adequacy according to the Pearson criterion (20.75), which confirmed the reliability of the calculations at a significance level of 0.05. The scope of application may be environmental impact assessment of transport construction objects and gas stations. The conditions for practical use are the availability of access to the Internet and the availability of sufficient user qualifications for performing calculations.
Anna Kharchenko, Vitalii Tsybulskyi, Oleksandr Chechuha, Sergei Zavorotnii, and Ivan Shuliak Private Company Technology Center
This paper considers the processes of cost management and the duration of road maintenance projects. A conceptual model is proposed to describe the relationship between time, cost, and quality of projects, which is based on the theory of the «silver triangle». Based on the results of studying the influence of factors, a model has been built for determining the cost and duration of road maintenance projects. Multiple optimization approaches to the components of the «silver triangle» of projects were used. The model constructed at the stage of initiating projects for the maintenance of roads, in contrast to the previous ones, is based on the pre-project level of quality indicators. Owing to the introduction of additional parameters and coefficients, the proposed model of cost management, quality, and duration of road projects was calibrated. The model graph was constructed and optimization was carried out on the example of a long-term road operation project. The algorithm of application of cost and duration management model of highway projects under conditions of uncertainty has been developed, which was checked for adequacy at an estimated error of about 3 %. This makes it possible to assert the effectiveness of the devised model for solving tasks related to project management for maintenance. The model was used to perform calculations based on a real example of the project, which showed that the optimization of the parameters of long-term contracts for the maintenance of highways produces a multiplier effect. This is expressed by reducing the administrative costs of the customer, reducing the responsibility of road services, creating prerequisites for stable financing of road works, the satisfaction of road users, and building strong partnerships between the customer and contractor
Alexander Kanin, Anna Kharchenko, Vitalii Tsybulskyi, Natalia Sokolova, and Alona Shpyh Private Company Technology Center
This paper reports a study into the main parameters of long-term contracts for the maintenance of roads. Weaknesses in existing methods and models of substantiation of the initial characteristics of contracts have been identified. It is established that the main reason for the transition to long-term contacts in the road sector is the need to improve the efficiency and effectiveness of road asset management. This determines the main goal to maintain the operational condition of all components of roads at a level that ensures the satisfaction of user requirements and contributes to the preservation of assets. A simulation model for substantiating the parameters of long-term contracts for road maintenance has been built, which makes it possible to simulate forecast assessments of the characteristics of contracts. Underlying this study is the Monte Carlo method, as well as the triangular law of distribution, models of deterioration and restoration of the condition of road elements. Taking into consideration these models, it was established that the error in justifying the parameters of long-term contracts according to the devised method is up to 10 %. The devised model was tested by applying the developed original LTCsimula program using an example of the section of a motorway with a length of 87.3 km with an average level of requirements. According to the results of the test, the assessment of the laws of distribution of value, as well as the amount of deductions and profits of a long-term contract, was carried out. The calculation results demonstrated the model’s capability to determine the strategies for the maintenance of roads, taking into consideration the risk of implementing a contract with an error of up to 3.9 %. The practical use of the devised simulation model makes it possible to improve the efficiency of operational maintenance of roads, as well as to save from 10 % to 40 % of the cost of road maintenance
Igor Gameliak, Andrew Dmytrychenko, Vitalii Tsybulskyi, and Anna Kharchenko Private Company Technology Center
This paper reports a study of the cement-concrete coating on bridges using FRP reinforcement. That has made it possible to design optimal structures by selecting the height for reinforcement arrangement in the layers of a roadbed in order to ensure strength characteristics. An engineering method for calculating a hard roadbed with composite reinforcement has been devised, which makes it possible to take into consideration its work both in a joint package of the structure with a slab and separately – when it exfoliates from the slab of the bridge's span structure. Underlying this research are effort-determining methods, estimation dependences from the theory of bending layered structures, as well as dependences from elasticity theory to assess the strength of materials for a roadbed. The consideration of shear strains when designing slabs has helped establish that the deflections according to the devises method were 1.4 times larger than those in the classical approach. The method was tested by a numerical experiment, which confirmed the need to use composite reinforcement in the upper layers of a road surface on bridges, which improves its durability by 1.2 times. The results of the numerical experiment indicate that the equivalent stresses in the lower layers of a free-moving roadbed were 2.91 MPa, and, when operating in a joint assembly with a slab, they took a negative value (–0.2 MPa). Practical application of the devised calculation method makes it possible to determine the refined normal stresses in the layers of a roadbed, taking into consideration the characteristics of structure operation. Owing to this, additional opportunities open up for calculating the roadbeds of bridges whose design utilizes the most common types of span structures in the bridge industry.
Vasyl Mateichyk, Viktoriia Khrutba, Anna Kharchenko, Yuliia Khrutba, Olexander Protsyk, and Iuliia Silantieva Elsevier BV
Оlena Slavinska, Vitalii Stozhka, Anna Kharchenko, Andrey Bubela, and Alina Kvatadze Private Company Technology Center
The article deals with the approaches to the construction of a multi-level hierarchical system of indicators for evaluation of the quality state of a motor road section. The model of the weight of parameters and characteristics of motor roads as a road-transport asset included in the information and management system of monetary evaluation was developed. The need for the research was caused by the necessity to develop a unified qualimetric model of monetary evaluation of a motor road section. As a result, the parameters and structural elements of motor roads were analyzed, which made it possible to consider the evaluation object – a road section – from the standpoint of the methodology of constructing complex multilevel hierarchical systems. Based on the proposed approach, a complete qualimetric model for the cost evaluation of a motor road was constructed, which is based on the method of decomposition of the object’s properties and includes the maximum number of possible parameters, characteristics, structural elements, and indicators of transport operational state. The mechanism of substantiation of the weights of parameters and characteristics of the evaluation object – a motor road section – through the rational combination of the cost method, the expert method and the method of equivalent relationships was proposed. The adequacy of the proposed model is proved by the analysis of standard errors that make up about 5 %, which that does not significantly affect reliability of the results of analytical calculations. The results of the conducted studies will be the further development of the information and management system for the monetary evaluation of a road-transport complex, the operation purpose of which is substantiation of rational managerial decisions on road assets in general and on motor roads in particular. The developed model of weights of motor road parameters can be used by enterprises and organizations of the road industry and can be a basis for making effective well-grounded managerial decisions on road-transport assets
Оlena Slavinska, Vyacheslav Savenko, Anna Kharchenko, and Andrey Bubela Private Company Technology Center
The mathematical model of evaluation of road-and-transport assets based on the level of real qualitative state was developed. The study was performed in connection with the lack of evaluation methods that take into account specifics of the assets of the road-and-transport complex. This problem is caused by absence of scientifically substantiated criteria for property evaluation of road assets. As a result of this study, the conceptual model for evaluating the road-and-transport infrastructure assets was developed. Unlike the conventional approach, the constructed conceptual model of the evaluation procedure is based on application of a qualimetric model and a multilevel hierarchical system of indicators. This approach has enabled elucidation of the real physical wear converse to the level of qualitative state of the asset which is the basis for a fair evaluation. The conceptual model of evaluation was laid in the basis of construction of a mathematical model that, in contrast to the conventional approach, takes into account the qualitative state of linearly extensive objects. The disadvantages of application of the developed mathematical model include the necessity of estimation of errors and the level of expert competence. However, the calculations made in testing of this model gives the right to assert fairness of the asset evaluation which is an input parameter to the information-and-management system of the road-and-transport infrastructure. The study results create a favorable environment for making managerial decisions on the assets as the objects of management in the road-and-transport complex and can be used by enterprises and organizations of the complex