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| Analysis of System Reliability for Gate Chambers |
| WANG Jian-Hua1, JIA Ren-Nian2 |
| 1.Zhejiang Water Resources And Hydroelectric School, Hangzhou 310016, China; 2.Water Conservancy and Hydropower Survey and Design Institute of Yueqing City, Yueqing 325608, China |
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Abstract Based on the reliability study of structure system and the characteristics of floodgate,the reliability calculation methods for system of the floodgate in use are discussed.Through calculating the system reliability of the gate chamber on soft foundation,its safety degree can be estimated more deeply.The floodgate may be regarded as a series system with four main failures modes including slip along the foundation,compression failure of the floodgate toe in the downstream line,tension crack of the floodgate heel in the upper stream and non-uniform stress distributions.Through the project example,the limit state equation of the floodgate was established,the failure probability and reliability index are obtained by the method of Monte-carlo.And system reliability and failure probability were calculated by common method.The results show that the four failure modes were ranked from highest to lowest effect: slip along the foundation,non-uniform distributions of stress,tension crack of the floodgate heel in the upper stream and compression failure of the floodgate toe in the downstream line.Besides,some relevant measures can be taken to raise the stability of the floodgate.The random property of some variables are affected the reliability index of the failure mode,for instance,the main influencing factors to stability are friction factor and angle of internal friction of foundation,and the non-uniform distributions of stress is affected by the upstream and downstream water levels.
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Received: 08 August 2013
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