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In order to control the key point of accidents during bridge construction, a number of major risk factors are recognized from the point of the insecure elements of human beings and the insecure status of objects, and a risk assessment index system of bridge construction stage is created based on these risk factors; so given the uncertainty and fuzziness of the risk factors, the risk assessment of...
From the standpoint of system engineering, multi-level fuzzy method was used to evaluate the safety of floating bridge. Considering the battlefield tactics factor and technical factor, the index system was built and 8 modules for comprehensive factor influence assessment and 24 modules for specific factor influence assessment were included. Expert evaluation method was used to determine the weight...
The running performance of train on Shiguo bridge is analyzed with energy random analysis theory for derailment. The calculated result shows that though the lateral amplitude exceeds the limit value of traffic safety given by code, the running safety, smoothness and comfort of train on Shiguo bridge can be guaranteed with the existing operation condition. The measurement of rate-limiting or reinforcement...
It's a hot topic of safety risk evaluation of buildings and structures which influenced by construction of adjacent underground engineering, however, the work hasn't been standardized yet, which can't satisfy the need of engineering construction. Based on deep research and practice, the concept, purposes, objects, bases, procedures, tasks, methods and achievements of safety risk evaluation are proposed...
“Fault Tree Analysis” uses the logical model and mapping methods to analyse, calculate or estimate the probability of phylogenetic. Thus, the reliability of the system, safety and risk could be assessed. They have been widely used in system's reliability study and to quantify the correlation of potential risk of the system. In the existing of reliability analysis, the time factor generally doesn't...
Bridge safety evaluation is very important to ensure the safe work of bridge. In the study, RBF neural network with genetic algorithm is presented to evaluate bridge safety, genetic algorithm is adopted to select the parameters of RBF neural network to improve the performance of RBF neural network. The influencing factors and evaluation index of bridge safety evaluation are determined. Then, the experimental...
A new approach of structural safety assessment for an existing rigid-frame arch bridge, constructed from multivariate and multi-layer analytic model. The assessment model of structural safety of existing rigid-frame arch bridges on the basis of technical condition, static loading test, dynamic loading test and load-carrying capacity, and the index system is proposed according to multivariate. In this...
By taking the short and medium span beam bridge as an example, its static forecast method and early-warning index system for bridge safety are in research. Evaluation criteria and early-warning grade of bridge technology condition are put forward. Assessment model for bridge safety is set up, based on the BP (Back-Propagation) Neural Network and Analytic Hierarchy Process (AHP). It makes some beneficial...
Based on the butterfly arch continuous girder bridge in HeiHe, China, this paper mainly deals with a quantitative risk analysis for V-shaped pier during the construction process, by using Analytic Hierarchy Process - Grey Correlation Analysis method. Firstly, hierarchical model of risk analysis is established, and structural property is identified as the highest risk factors during V-shaped pier construction...
Various risks exist during the service life of a bridge; rational risk assessment and risk minimizing are very significant to ensure the safety of the bridge structure. Upon analyzing the probability and grade standard of the bridge risk situations, this thesis analysis various risk elements that may occur during bridge designing, constructing, operating and maintaining and constructs a index system...
The key computation of bridge safety fuzzy comprehensive assessment using analytic hierarchy process is to realize membership transformation. However the existing membership transformation methods can't indicate "which parts in index membership are useful for object classification and which parts are useless". It results in that the redundant data of no use in object classification are used...
To find an effective model for safety assessment of civil engineering structures under the uncertainty and data lack, the unascertained set was introduced to measure the reliability and a safety assessment model with credible identification principle was set up. Then, engineering practice for the reliability assessment of a cable-stayed bridge showed that the model proposed here can complete the safety...
Urban traffic state analysis plays an important role in the solution of traffic congestion problem. To identify traffic state effectively is a foundational work for improving traffic condition and preventing traffic congestion. In this paper, an index system of traffic state was established, it through analysis of the multi-source and heterogeneous data from the traffic network, and for the demand...
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