Safety Assessment Index System Research Articles

Safety Assessment Method of Concrete-Filled Steel Tubular Arch Bridge by Fuzzy Analytic Hierarchy Process

The concrete-filled steel tubular (CFST) arch bridge has achieved significant development in recent years due to its unique mechanical performance and technical advantages. However, due to the lagging theoretical research compared to engineering practice, many problems have been exposed in the existing bridges, resulting in adverse social impacts and enormous economic losses. With the increasing prominence of safety issues in CFST arch bridges, it is necessary to assess their safety condition in service. This paper establishes a safety assessment index system for CFST arch bridges using the fuzzy analytic hierarchy process (AHP) based on an exponential scale. The assessment method proposed includes the following main points: (1) Bridge safety assessment is closely related to the load-bearing capacity of components. This study proposes an assessment index that comprehensively considers both the defect conditions and the design load-bearing capacity of components for the safety assessment. (2) The exponential scale method is introduced to safety assessment for the first time, and the AHP based on an exponential scale is applied to calculate the component weights. (3) Considering the specific structural characteristics of CFST arch bridges, this study provides a detailed division of component types and calculates the component weights. By combining the component assessment indexes, a comprehensive safety assessment index system is established, and a safety assessment method for CFST arch bridges is proposed. (4) Taking the Jiantiao Bridge in Zhejiang Province as an engineering case, the load-bearing capacity of components is calculated using finite element software ANSYS 19.1. Based on the established safety assessment index system, the safety of the bridge is assessed by integrating the inspection results. (5) Software for the safety assessment of a CFST arch bridge is developed using Visual Basic, and the assessment results align well with the actual condition of the bridge.

Comprehensive risk management of health, safety and environment for social emergency rescue organization

During the rescue and relief work of social emergency rescue organizations, the rescue team members face significant responsibilities and risks. Social rescue organizations need to improve funding, available equipment and other aspects compared with professional emergency rescue organizations. Moreover, the development of rescue levels among emergency rescue organizations is unbalanced, and rescue teams’' comprehensive quality and skills are uneven. To understand the safety risks of these organizations before the implementation of rescue and relief tasks, the task situation and its characteristics must be assessed timely, and safety must be ensured under the premise of efficient completion of the rescue missions. Based on the theory of safety system engineering and health, safety, and environment risk management, a risk management model is established to achieve a closed-loop risk management. The risk factors in rescue and relief tasks of social rescue organizations were identified, and a health, safety and environment risk assessment index system and grading standard were established. A gray cloud model was applied for the evaluation method, the problems of information randomness, risk-level boundary fuzziness and randomness of the evaluation index data were effectively solved. Subsequently, a risk hierarchical early warning and control strategies were proposed to allocate emergency resources rationally. The proposed method was verified and found to have universal applicability and strong practicability.

Normal cloud model theory-based comprehensive fuzzy assessment of wooden pagoda safety

• It's the first time to apply normal cloud model into wooden pagoda safety assessment. • Two-way mapping of the "quantitative description-qualitative concept". • A four-level safety assessment index system. Currently the safety assessment of wood structure ancient buildings is mainly qualitative description, ignoring accurate quantitative calculation, and there are uncertain factors such as fuzziness and randomness that affect the results in the assessment process. Therefore, based on the cloud model theory of transformation between qualitative and quantitative uncertainties, this paper proposes a normal cloud model-based safety assessment approach for the protection research of wooden pagoda. A multi-level assessment system combining qualitative and quantitative indexes is constructed, and the comprehensive weight of the evaluation indexes is determined by combination weighting method. And combining with the scoring of evaluation indexes through quantitative analysis of point cloud, qualitative evaluation of experts, and published high-level papers, the comprehensive evaluation cloud model is constructed. According to the standard grade division, the criteria cloud model is constructed. And safety performance grade is determined by comparing the cloud similarity between the two clouds. Then this paper sets Yingxian wooden pagoda in China as an example, safety performance is quantified under this approach to determine its safety performance grade. The results show that the pagoda is the closest to third grade, in a certain dangerous state and consistent with the actual situation. The method takes into account the randomness and fuzziness factors, which makes assessment process more comprehensive and objective, provides a research paradigm for the safety assessment of ancient wooden buildings.

Research on Safety Evaluation of Nuclear Power Plant Based on Entropy Weight Method

Since the 18th National Congress of the Communist Party of China, China’s nuclear security has entered a new era of safety and efficiency. At the same time, the first white paper “China’s nuclear security” emphasizes the need to deal with various nuclear security challenges and maintain nuclear security. In this paper, an index system of nuclear power plant safety assessment is constructed, which includes three first-class indexes: internal risk assessment, external risk assessment and human risk assessment of nuclear power plant. Each index is weighted and evaluated by entropy weight method, and the safety of all nuclear power plants in operation during 2013-2018 in China is researched vertically as well as Ling’ao, Yangjiang, Ningde and Fangchenggang nuclear power plant is researched horizontally.

Analysis of the Safety Factors of Municipal Road Undercrossing Existing Bridge Based on Fuzzy Analytic Hierarchy Process Methods

Increasing traffic volume and insufficient road lanes often require municipal roads to be reconstructed and expanded. Where a road passes under a bridge, the reconstruction and expansion project will inevitably have an impact on the bridge. To evaluate the safety impact of road engineering projects on bridges, this paper evaluates the safety of the roads and ancillary facilities of highway bridges involved in municipal road engineering projects. Based on a comprehensive analysis of the safety factors of municipal roads undercrossing existing bridges, a fuzzy comprehensive analytic hierarchy process (AHP) evaluation method for the influence of road construction on the safety of existing bridges is proposed. First, AHP is used to select 11 evaluation factors. Second, the target layer, criterion layer, and index layer of evaluation factors are established, then a safety evaluation factor system is formed. The three-scale AHP model is used to determine the weight of assessment indexes. Third, through the fuzzy comprehensive AHP evaluation model, the fuzzy hierarchical comprehensive evaluation is carried out for the safety assessment index system. Finally, the fuzzy comprehensive evaluation method is applied to the engineering example of a municipal road undercrossing an existing expressway bridge. The comprehensive safety evaluation of the existing bridge reflects the practicability and feasibility of the method. It is expected that, with further development, the method will improve the decision-making process in bridge safety assessment systems.

Research on Integrated Safety Assessment in the Process of Electric Vehicle Charging

With the increasing number of electric vehicles, the problem of charging reliability and safety has become the focus of foreign scholars and industry. By analyzing the charging safety characteristics of power battery, charge and discharge equipment and power supply equipment of electric vehicles, the safety mechanism of integrated electric vehicles is established in this paper. Based on the research of integrated safety warning and control, the integrated online warning module and intelligent protection module of electric vehicle charging are constructed. Based on the failure statistics of the integrated safety early warning system and combined with the integrated safety assessment index system of EV charging process, the regional EV charging safety can be assessed, so as to promote the healthy development of EV charging.

The Research and Development of Safety Assessment Software System for Portal Cranes

The safety assessment index system is formulated for portal cranes according to the operation features of this type of crane. The comprehensive assessment matrix and subsequent assessment results are finalized for all levels of index according to the variable weight analytic hierarchy process (AHP). The safety assessment software system is developed for portal cranes on the basis of above outcomes. Relying on C# programming language, the software has enabled the functions of data acquisition and result processing. In addition, it shows a remarkable utility value of the safety assessment of portal cranes and is capable of the safety assessment for the portal cranes in service.

Assessment of Laboratory Safety in Universities Based on Combined Weighting Method and Unascertained Measure Theory

In order to avoid accidents and improve the level of laboratory safety management in universities, a laboratory safety assessment method based on entropy weight method, analytic hierarchy process and unascertained measure theory is put forward. The laboratory safety assessment index system is established by selecting eight assessment indexes such as hazardous chemicals management, instrument and equipment management and personal protective equipment management; The comprehensive weight of the assessment index is determined by combining the combination weighting method of analytic hierarchy process (AHP) and entropy weight method (EW). According to the principle of maximum membership degree, the safety grade of university laboratory is determined, and compared with the actual results. This work indicated that this innovated method can reasonably evaluate the current situation of laboratory safety, and it can provide a reference for strengthening laboratory safety management.

Safety Evaluation of Sustainable Uranium Development in China Combined with an Analytical GAN Framework

Uranium is the basic raw material for nuclear energy and is quite highly regarded. Developing a safe supply of uranium is important for safeguarding sustainable nuclear development. The purpose of this study is to evaluate the sustainability of uranium development in China based on dynamic system modeling combined with GAN (Generative Adversarial Network) analysis. We considered eight essential indicators and 42 sub-indicators as part of a detailed quantitative description, and then developed a framework to evaluate and rank China-specific sustainability in light of the quantitative performance of five options for fuel cycle transition scenarios. We began by using KMO sample measurements and the Bartlett Test of Sphericity to determine the suitability of factor analysis and the fitness of the corrected model map and observation data. We then analyzed the roles of different representatives of the decision makers and their impacts on the overall ranking by applying GAN methods from a weighted perspective. Five transition scenarios identified are 1) Pressurized Heavy Water Reactors, 2) Mixed Light Water Reactor + Fast Reactor, 3) Mixed LWR+FR fuel cycle scheme with heterogeneous irradiation, 4) Mixed Pressurized Water Reactor + FR fuel cycle scheme with plutonium recycled directly and repeatedly, and 5) Sodium-cooled fast breeder reactor power plant. The results showed that scenario 1 is the most unsustainable and highly confrontational scenario with a high demand for uranium resources, the lowest sustainability and a high level of antagonism among departments. On the other hand, Scenario 5 requires more advanced technology but exhibits less antagonism among the departments, and thus it largely satisfies the basic requirements for uranium sustainability and low levels of antagonism. In this paper, a safety assessment index system for the uranium supply is computed using a GAN framework. This system plays a crucial role in the sustainable supply and development of uranium, and provides flexibility for coping with the evolution and inherent uncertainties of the necessary technological developments.

Whole Risk Assessment System and Management System of Urban Road Tunnel Operation Stage

The index system and evaluation method of safety assessment in the operation stage are established to realize the safety risk assessment and management in the operation stage of urban road tunnel. The index scores are obtained from the fuzzy comprehensive evaluation model, and the overall safety risk grade is derived. In view of the index level with an evaluation level greater than or equal to Ⅲ, special risk assessment is conducted, and safety risk solving measures are introduced. A corresponding safety risk management system platform for urban tunnel operation stage is developed on the basis of the results. The results and application of this study have a certain reference value for managing tunnel informatization based on safety risk management.

Research on Civil Aviation Cabin Safety Management——Empirical Research Based on the Civil Aviation Cabin Safety Assessment

In order to improve the level of civil aviation cabin safety management and achieve a comprehensive and rapid assessment of cabin safety, this study is based on a sample of 359 valid cabin unsafe events by the Civil Aviation Administration of China from 2006 to 2019. Systems engineering theory of the three elements of "human-machine- environment" as the basis . Processing the data from the questionnaire survey by using Exploratory Factor Analysis (EFA) and combining with the results of interviews with experts in related fields . 14 secondary indicators and 30 tertiary indicators were selected to evaluate cabin safety from the four aspects of personnel, environment, management and loading. In order to ensure the correctness and reliability of the cabin safety assessment index system, quantify its path coefficients and determine its degree of influence, based on the established assessment index system, construct a structural equation model (SEM) and The AMOS software is used to perform a confirmatory factor analysis (CFA) on the relationship between cabin safety assessment indicators.Finally, the concept of establishing a cabin safety assessment system was proposed, and two sets of assessment methods and assessments including comprehensive (including 17 secondary indicators and 40 tertiary indicators) and quick (including 14 secondary indicators and 30 tertiary indicators) were provided Specific method.

Study on Evaluation of Beijing-Shanghai High-speed Railway Operation Safety

The study aims to evaluate operation safety level of Beijing-Shanghai High-speed Railway in China. In order to do so, this research establishes a safety assessment index system of Beijing-Shanghai HSR based on AHP firstly. Then based on the fuzzy matter-element theory, with the concept of the Euclid approach degree (EAD), compound fuzzy matter-element for safety level evaluation is established. The results show that Beijing-shanghai HSR is a better operation safety level in China. According to the results, some suggestions on improving Beijing-shanghai HSR operation safety are proposed.

Comprehensive safety assessment for CFST tied arch bridge subjected to explosion

Accidental vehicle explosion and car bomb blast causes certain damage to bridge structure, while studies on safety assessment for bridge structures subjected to blast are limited, especially for the concrete filled steel tube(CFST) tied arch bridge(tied arch bridge in short). This study developed a safety assessment index system for CFST tied arch bridge under explosion by the modified analytic hierarchy process(AHP) model based on catastrophe theory. The Jinta bridge was used as a demonstration case for this study and the dynamic responses of tied arch bridge under explosion loading was simulated by numerical simulations. The results show that the proposed system can reflects the safety condition of the tied arch bridge after explosion. The evaluation system presented in this study can serve as an approach for the safety assessment of tied arch bridge and provide the basis for engineering decision-making of bridge structures after explosion accident.

Safety Assessment Method of Bridge Crane Based on Cluster Analysis and Neural Network

Bridge crane is one of the most widely used hoisting equipments. The safety assessment of bridge crane can prevent potential failure in time. However, there is no comprehensive and accurate safety assessment method for bridge crane. This paper presents a safety assessment method of bridge crane based on cluster analysis and fuzzy neural network. First, we establish the safety assessment index system of bridge crane. Then, we revise the weight allocation of expert by cluster analysis, which can make expert evaluation set more rational. Next, we construct fuzzy membership function and the fuzzy neural network of safety evaluation model. Finally, this safety assessment method is verified by an engineering example, and the assessment result fits well with the actual situation.

Research on Safety Comprehensive Assessment Method for Air Traffic Control Based on RBF Neural Network

To assess the safety situation in air traffic control effectively, a comprehensive assessment method based on RBF neural network is proposed. At first, the safety assessment principle based on RBF neural network is introduced, and then the safety assessment index system for air traffic control is established from four aspects of human, machine, environment and management. Simulation example of ATC safety assessment gives us a satisfactory result for RBF neural network.

Study on the Discrimination Method of Driving Safety States Based on BP Neural Network

In order to estimating the state of driving safety and reducing accidents, a discrimination method of driving safety states based on BP neural network was presented in the paper. Firstly, the influencing factors on the vehicle driving safety were analyzed, and ten main factors that affected the driving safety of vehicles were confirmed, which constitute the safety assessment index system for vehicle driving. Then the discrimination model of driving safety states based on BP neural network was established, and inputs and outputs for the neurons were determined. At last, the input data for neurons were acquired on the basic of the main evaluation indexes of vehicle driving safety, and these data were used to train the neural network. The training result conform to expectations of the training requires.

The Operation Safety Evaluation of Xi'an Subway

Line 2 of Xi’an subway is the earliest subway in Shaanxi , its safety has not been fully and thoroughly checked because of the perfect record of non-fault during its operation. In this paper, facility, management and fault indexes are set up, and the and indexes are also built through the organization and responsibility analysis of subsystem so as to safety assessment index system. Finally, AHP and fuzzy evaluation method are used to evaluate the subway operation results and propose appropriate corrective measures.

Measurement of Safety Performance of Construction Sites Using the Improved Grey Correlation Analysis

This paper proposes an improved evaluation model combining grey correlation analysis and AHP method that measures the safety performance of construction site. The safety assessment index system was established relating the actual condition of construction site. The weight of each assessment index was calculated through AHP model which use in grey correlation analysis for breaking through the limitations of conventional method. Then, the grey correlation degree was obtained through calculating the weighted means of grey correlation coefficient, and then, the rank of safety performance level of construction sites was determined. Through this improvement, the assessment results can be more scientific and functional. The effectiveness of our methodology was verified with an empirical study. The results show that this method can be an effective tool to predict the safety performance of construction projects sites, which is useful to reduce the occurrence of the construction safety misadventure.

Study on the Safety Assessment of the Mobile Scaffolding System Metal Structure Based on the Onsite Inspection

This article based on the analysis of the characteristics and the content of the Mobile Scaffolding System (MSS) safety assessment, and according to the on-site inspection of the two MSSs, constructed the MSS metal structure safety assessment index system, and applied the expert scoring method to give the importance degree of every index, finally put forward the fuzzy comprehensive evaluation method for the evaluation criteria.

Study on Safety Assessment of Fire Hazard for the Construction Site

In order to better prevent fire accidents of construction site, a index system of safety assessment was established for fire hazard of construction combined with related specifications site, first level indexes of which were composed by fire safety management, general floor plan, building fire, thermal insulation material and temporary fire control facility, the weight of the safety assessment indexes was determined by AHP, and five single factor and the overall of index system of safety assessment for fire hazard of the construction site were evaluated respectively by fuzzy mathematical methods, and the safety situation of each single factor in the system was understudied, at the same time, the overall fire safety conditions of the system was grasped.