ABSTRACT
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The safety evaluation system with three-tier Java architecture has been applied to assess the risk level of highway utilities including surface performance of highway, tunnel, bridge and so on.
A transfer matrix is set up to control the status of safety risk management. The matrix could be also adjusted or redefined in according to the various requirements of enterprises. The user with administrator privileges could flexibly modify the content of the matrix if necessary.
The system provides the base of the safety analysis with a common library of accident risk matrix (Fig. 1) that can describe the relationship between the severity and the probability of accident occurrence when the performance failure of the highway facilities causes accidents. Accident risk matrix. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315207681/cd556cd4-4dcf-4efe-8e29-56fc67b8bfbd/content/fig346_1.tif"/>
At the first, the facilities in the system are defined as bridges, channels, highway auxiliary facilities, electrical devices, even construction sites. The record of the facility is created by accident risk matrix, safety requirements, facility descriptions, design principles, and history records. User can select the risk matrix by his experience or define a new one. Any documents or pictures related to the facilities can be retrieved by fuzzy query. The status of the record can be traced in any time.
As soon as the facility is determined, all possible dangerous factors on it will be recognized. The user can find out the number of accident cases and references for the facility and establish the relationship with it. The risk control methods could be considered if it existed.
The system can automatically calculate both the initial danger probability and the probabilities after the control method is implemented in order to reduce safety risk. If the risk were higher than permissible level, the series of control operations should be adopted to improve the performance or status of the facility until the risk probability has be controlled to either safety level or ALARP (As Low As Reasonable Practical).
The system also has the following functions:
– Risk distribution statistics: it can show statistical list and draw the histogram of identified dangers, caused accidents, control methods, and safety risk rank.
– Documentation management: it can upload or manage all documents related to the design, reference, requirement, safety regulars and laws of the facility.
– Risk control reports: It creates the hazard logs at key points in time, in which the information about facility, danger, accident, control method are included. The report shows the current status of them at that moment.
– Background management: based on the user privilege management system, the user with different privilege roles can visit to various components or functions in accident risk analysis and hazard logs.
