Modal Analysis of Chushandian Gravity Dam

Abstract

This article uses the finite element software ABAQUS to establish a three-dimensional finite element model based on the overflow dam section 12 # ~15 # and surface outlet dam section of the Chushandian gravity dam. The stress and displacement distribution of the 12 # ~15 # dam section of the Chushandian gravity dam under normal water storage level are analyzed; On this basis, modal analysis is conducted on the 12 # ~15 # dam section to study the impact of the dam's own modal conditions on the normal operation of the dam. The research shows that: (1) Under the condition of normal height water level, there is a small tensile stress at the dam heel, and the compressive stress at the dam toe is within the normal range. There is significant stress at the intersection of the upper curved part of the overflow dam and the transverse joint. The dam body strength meets the requirements and can be considered safe for the reservoir. (2) Modal analysis of the model reveals that significant deformation can occur at the right side of the dam crest during lower frequency vibrations. With the increasing frequency, the easily deformed parts of the dam are still at the top of the dam, and the displacement of the easily deformed parts is increasing. The position of the easily deformed parts is moving along the Dam axis, and the deformation direction of the easily deformed parts will change regularly.