This paper presents some experimental data on roll compaction concrete cofferdam vibration induced by underwater explosion. A formula for the bubble pulse period of underwater explosion is proposed via dimension analysis and compared with Cole formula. An experiential formula is summarized on the relation among the structure vibration velocity, explosive charge and the distance from charge to structure. The formula indicates that the structure vibration velocity is directly proportional to square root of the charge when the charge package was near the structure. When the distance is farther between the charge and the cofferdam, the peak particle velocity (PPV) is smaller.
With the progress of engineering, technology viscous damper are widely used in the field of engineering structures. Its principle is that when the external normal disturbance on the structure, the viscous damper will not generate damping force on the structure; when there is a strong external disturbance (strong earthquake, strong wind), The dampers can produce a reaction force, which can reduce the damage of the structure and improve its seismic capability. In this paper, the new viscous damper has been experimentally tested, including: 1. Test for maximum damping force; 2. Test for damping coefficient, damping exponent; 3. hysteresis curve. By analyzing the experimental data, the actual performance parameters of the new viscous damper are obtained, which provides certain support for future mass production and use of the product.
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