Operation State Evaluation of Miter Gate Based on On-Line Monitoring and Finite Element Analysis

Abstract

As an essential part of the water conservancy hub, the miter gate undertakes the vital task of navigational operation and works in a complex basin with a high water level drop for a long time; therefore, it is necessary to ensure its safe operation. In this paper, taking the Gezhouba No. 2 ship lock miter gate as an example, the actual gate stress and crack signals are obtained using the online monitoring system. The stress distributions of the gate under different working conditions are studied using finite element simulation analysis. Combining simulation analysis with the collected signal analysis, the operation status of the actual gate under each working condition is evaluated. The results show that the stress analysis of the online monitoring is consistent with the finite element analysis results, which verifies the reasonableness of the sensor arrangement. The stress is more concentrated in the area of the gate shaft column, the middle door seam, and the rear flange plate during the operation of the miter gate, and the maximum stress appears on the central sector shaft column of the gate. The cracks of the miter gate mainly appeared in the lower layer of the gate body, and the cracks expand gradually during the long-term operation of the gate. The crack expansion speed corresponds to the miter gate’s stress magnitude.

An Intelligent Monitoring System for the Force Characteristics of Floating Bollards in a Ship Lock

“…Li et al [24] proposed an online monitoring method for bollard structure force characteristics based on real-time data acquisition and transmission technology and constructed an overall framework for a bollard structure monitoring system. Li et al [25], using the miter gate of the No. 2 lock of the Gezhouba Dam, Wuhan, China, as an example, enacted an online monitoring system to obtain the actual stress and crack signals of the gate, which was combined with an analysis of numerical simulation test data to evaluate the operational status of the actual gate.…”