Papers by Keyword: Safety Evaluation

Abstract: For the purpose of grasping the stress state, vibration characteristics and safety of the steel arch in Nanjing Olympic Sports Center, which is the main support among the stadium roof system as well as the world's largest oblique arch structure, a real-time health monitoring system was established and the main achievements including the system constitution, monitoring items and layouts of measuring points were described. The monitoring data measured during the 2 years period from 2014 to 2016 as well as the SAP2000 finite element software were combined to conduct the status identification and safety evaluation. The results show that the simulation results are consistent with the measured date; The measured alignment of the large arch is relatively stable, although the structural stiffness of arch has weakened compared with the designed state, the low order vibration frequencies are stable during the 2 years period; The stress state of each monitoring component is at safe levels, and fluctuates within a small range affected by the extreme seasonal temperature changes.

Abstract: Corrosion defect in oil tubes is one main threat for the safety production of oil field. The corrosion defect in the tube will cause stress concentration and even lead to failure. The injection of CO₂ widely used during the recent years in oil fields, making the corrosion problems more severe. In this study a finite element model for the residual strength analysis of oil tube with corrosion defect was established by the programing language APDL. Based on the actual data of one oil well in Tahe oil field in China, the sensitivities of the axial length, circumferential width, radial depth of the corrosion defect, the internal pressure and axial force on the residual strength of the tube was examined in detail. The proposed method can be referred in the safety evaluation for oil tubes with corrosion defect.

Abstract: In order to appraise the safety and reliability of bridges effectively, the comprehensive evaluation model based on analytic hierarchy process was established. The weight of evaluation index was calculated by using the model, and each evaluation index was given score by experts according to actual circumstances, and, on this basis, safety level of the bridge was obtained. And, afterwards, the model was applied to an engineering example for Huangjiaba Bridge. The results show that the evaluation level of bridge safety is third-level, with serious problems existing in this practical example, and the corresponding measures are proposed, which can provide scientific reference for bridge safety management.

Abstract: According to the situation of high frequent accidents and supervision difficulties in highway construction project. The fuzzy evaluation model for the affecting factors of highway construction accidents was established. Through safety analysis on many accidents, it was considered that highway construction accidents were commonly affected by workers’ unsafe behavior, unsafe condition, environmental risk and management. Then the weight of relative factors were determined. Finally the highway construction safety management evaluation was built. It shows that this method is reasonable and handled, which provides a good thought for the scientific, quantitative and available evaluation of highway construction safety management.

Abstract: This paper presents a potential methodology regarding the safety evaluation of front-line builders that based on whose psychological factors. The methodology is extended by the impact of front-lines builders’ psychological factors on the safety of construction, by researching on the SAS, SDS and self-restraint related factors to investigate the physiology and psychological condition of bridge and tunnel builders in Anhui, China, from which we aim to create a safety model of relatively related factors via the statistics of investigation.

Abstract: The severity of accidents can show the dangerous of intersections directly, however, the safety of intersections which have not accident data could not be evaluated easily. This paper introduced “Intersection Dangerous Parameter (IDP)” model to quantify intersections’ safety. Because IDP is calculated based on Intersection Conflict Dangerous Parameter (ICDP) and Intersection Accident Dangerous Parameter (IADP), IDP model can help to evaluate the safety of intersections which have not accident data. Rely on Chinese and American data, IDP model is calibrated and the safeties of three type intersections are evaluated using this method.

Abstract: The bearing capacity calculation in horizontal and safety assessment methods of high-pile pier slideway while large platform dragged horizontally to move to barge was studied based on the theoretic derivation and numerical simulation method. According to the research, the load effect of 6000ton slideway in the process of large platform dragged horizontally is obtained, the safety of slideway is evaluated, and the safety measures of slideway structure which should be taken during dragging platform are recommended. The results of the calculation and analysis show that the bearing capacity of slideway meet the requirements of design under the horizontal load of 11550kN by using uniform force to calculate, and the displacement is less than the width of the structure gap between two segments. The 6000ton sildeway is safe under horizontal load of 11550kN. These conclusions can provide the basis for the safety state analysis of high-pile pier slideway structure and the optimization of plan to move the large platform to load on barge.

Abstract: In this passage is about the safety evaluation on the conveyance structure of small hydroelectric power station. Applying Binary comparative indicators to determine the weights and fuzzy recognition model on the conveyance structure of small hydroelectric power station’s assessment. Compared other models with fuzzy recognition model which will be explained in detail in the next section on a specific small hydropower station. The results show that the fuzzy recognition model is feasible and effective on safety evaluation on the conveyance structure of the hydroelectric power station.

Abstract: Electric power industry is a basic industry of national economy, the power plant production safety related to people's life safety and property of the state, the power of reform and social stability, safety evaluation of power generation enterprises is an important guarantee of safety production in power generation enterprises.The paper establishes the BP neural network model, utilize BP neural network optimization ability and good fitting ability, combining the index system build, carries on the appraisal to the power generation enterprise security.Now the instance verification results show that BP neural network is applied in safety evaluation of power generation enterprises, not only can accurately evaluate the safety situation of power generation enterprises, and the speed of convergence process is quickly.

Abstract: Research silymarin food security through animal experiments. Acute toxicity test, mouse bone marrow micronucleus test, mice sperm abnormality test results were evaluated. Male and female mice by oral maximum tolerated dose (MTD) are more than 20.0g/kg body weight, according to the acute toxicity grading standards, which are non-toxic level. Mouse bone marrow micronucleus test, mice sperm abnormality test and genotoxicity test were negative. Showed that silymarin is a food safety component.