Research on nonlinear damage and failure mechanism of reinforced concrete sluice under earthquake action

Abstract

A nonlinear seismic damage analysis method for the sluice foundation water system had been established to address the shortcomings in the seismic analysis of reinforced concrete sluice structures. Taking a flood control gate project in a certain VIII degree area as an example, the dynamic response, damage range and degree of the water gate structure under earthquake action were studied. Based on the calculation result, the nonlinear earthquake damage and failure mechanism of the water gate foundation water system was revealed. The result showed that:(1) The method considered factors such as wireless foundation radiation damping effect, concrete dynamic damage, reinforced concrete bonding and sliding effect, and fluid solid coupling effect between water body and water gate structure, which could accurately reflect the stress state of reinforced concrete sluice under earthquake action. The accuracy of the established method was verified by comparing the calculation result with other method;(2) Under earthquake action, concrete damage occurred at the connection between the bent column and the gate pier, and the damage area basically covered the cross-section of the bent column, with the maximum damage value reaching 0.659. The concrete was basically in a state of damage and failure;(3) As the duration of the earthquake increased, concrete damage began to appear at the corner of the bent column, and the damage value and area continued to increase. When the damage area run through the entire cross-section of the bent column, it could be considered that the chamber structure had been undergone seismic damage.

Keywords

reinforced concrete sluice / numerical simulation / non-linearity / fluid structure coupling / damage and failure mechanism