Water Science and Engineering 2020, 13(2) 162-170 DOI:   https://doi.org/10.1016/j.wse.2020.07.001  ISSN: 1674-2370 CN: 32-1785/TV

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Keywords
Combined dam structure
Deformation coordination
CC-RCC
Dynamic response
Finite element simulation
Concrete damaged plasticity (CDP) model
Authors
PubMed

Deformation coordination analysis of CC-RCC combined dam structures under dynamic loads

Bo-wen Shi a, Ming-chao Li a, *, Ling-guang Song b, Meng-xi Zhang a, Yang Shen a

a State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China
b Department of Construction Management, University of Houston, Houston, Texas 77204, USA

Abstract

A combined dam structure using different concrete materials offers many practical benefits. There are several real-world cases where large-volume heterogeneous concrete materials have been used together. From the engineering design standpoint, it is crucial to understand the deformation coordination characteristics and mechanical properties of large-volume heterogeneous concrete, which affect dam safety and stability. In this study, a large dam facility was selected for a case study, and various design schemes of the combined dam structure were developed by changing the configurations of material zoning and material types for a given dam shape. Elastoplastic analysis of the dam-foundation-reservoir system for six schemes was carried out under dynamic conditions, in which the concrete damaged plasticity (CDP) model, the Lagrangian finite element formulation, and a surface-to-surface contact model were utilized. To evaluate the mechanical properties of zoning interfaces and coordination characteristics, the vertical distribution of the first principal stress at the longitudinal joint was used as the critical index of deformation coordination control, and the overall deformation and damage characteristics of the dam were also investigated. Through a comparative study of the design schemes, an optimal scheme of the combined dam structure was identified: large-volume roller-compacted concrete (RCC) is recommended for the dam body upstream of the longitudinal joint, and high-volume fly ash conventional concrete (CC) for the dam body downstream of the longitudinal joint. This study provides engineers with a reference basis for combined dam structure design.

Keywords Combined dam structure   Deformation coordination   CC-RCC   Dynamic response   Finite element simulation   Concrete damaged plasticity (CDP) model  
Received 2020-07-20 Revised 2019-12-24 Online: 2020-06-30 
DOI: https://doi.org/10.1016/j.wse.2020.07.001
Fund:

This work was supported by the National Natural Science Foundation of China (Grant No. 51879185) and the Fund of the National Dam Safety Research Center (Grant No. CX2019B02).

Corresponding Authors: Ming-chao Li
Email: lmc@tju.edu.cn
About author:

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