Blast Performance and Damage Evaluation of High Arch Dams Subjected to Far-Field Underwater Explosions: Consideration of Joints
Publication: Journal of Structural Engineering
Volume 149, Issue 3
Abstract
The blast performance of 300-m-high arch dams is an important subject which has been studied widely over the years. An arch dam is convex on the upstream face, and the load is transmitted along the arch axis to the abutments at the ends of the dam. However, the integrity of arch dams is affected by the transverse contraction joints. The blast resistance performance of a 300-m-high arch dam subjected to far-field underwater explosion was investigated considering contraction joints. The acoustic–structural method was employed to model the underwater explosion loads and the interactions among the dam–reservoir–foundation system. To verify the reliability of the acoustic–structural method, a -scale model of an arch dam subjected to far-field underwater explosion was tested. A zero-thickness cohesive element was employed to model the mechanical behavior of contraction joints with grouting. Nonlinear dynamic response and damage progress of the high arch dam with transverse contraction joints to the far-field underwater explosion were investigated in terms of peak displacement, velocity, and damage modes. The tensile damage mechanism of the arch dam subjected to the far-field underwater explosion was discussed. The damage modes and deformation mechanism of high arch dams at the different positions of initiation point were presented. A damage index based on the damaged area in the downstream face and foundation face is proposed to evaluate the blast performance of high arch dams subjected to far-field underwater explosions. The results show that the contraction joints have a certain influence on the nonlinear dynamic and damage modes of high arch dams subjected to the far-field underwater explosion. The damage is larger with explosive charges near the one-quarter arch ring in the weak stiffness bank due to the asymmetry of the arch dam.
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Data Availability Statement
Some or all data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors gratefully appreciate the support from the National Natural Science Foundation of China (Nos. 52179140, 51939008, and 52109164), the Natural Science Funds of Hubei Province for Distinguished Young Scholar (No. 2021CFA093), and the Project of Research Program on Applied Fundamentals and Frontier Technologies (No. 2020020601012282).
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 149 • Issue 3 • March 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 3, 2022
Accepted: Nov 1, 2022
Published online: Dec 29, 2022
Published in print: Mar 1, 2023
Discussion open until: May 29, 2023
ASCE Technical Topics:
- Acoustics
- Arch dams
- Blasting effects
- Continuum mechanics
- Dams
- Design (by type)
- Detection methods
- Disaster risk management
- Disasters and hazards
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Explosions
- Geomatic surveys
- Geomatics
- Geotechnical engineering
- Joints
- Load factors
- Man-made disasters
- Methodology (by type)
- Nonlinear response
- Solid mechanics
- Structural behavior
- Structural design
- Structural dynamics
- Structural engineering
- Structural members
- Structural systems
- Underwater surveys
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