Seismic metamaterial and method for blocking propagation of seismic lamb waves

Abstract

The invention provides a seismic metamaterial and method for blocking propagation of seismic lamb waves, and belongs to the technical field of foundation seismic isolation. The seismic metamaterial comprises a plurality of metamaterial unit cells arranged periodically, each metamaterial unit cell comprises a steel block and a soil block, the periphery of each soil block is cubic, a containing cavity is formed in the center of the interior of each soil block, each steel block is located in the corresponding containing cavity, each containing cavity is matched with the corresponding steel block in peripheral shape, the contact surfaces of each steel block and the corresponding soil block are tightly attached, the elastic modulus of the material of the soil block is 0-90 MPa, and the mass density is 600-22,000 kg / m < 3 >. The metamaterial is simple in structure and capable of blocking seismic lamb waves and protecting buildings.

Description

technical field [0001] The present disclosure relates to the technical field of foundation isolation, and in particular to a seismic metamaterial and a method for isolating the propagation of seismic Lamb waves. Background technique [0002] Among natural disasters, earthquakes cause the most damage to buildings and can cause even greater damage to the environment, economy and society. Worldwide, millions of earthquakes occur each year with more than 1,000 earthquakes measuring 5.0 or above on the Richter scale. When an earthquake occurs, seismic waves propagate from the depth of the epicenter, carrying huge energy and launching in all directions, which can cause major damage to civil structures. [0003] The traditional anti-seismic design mainly focuses on the anti-seismic design of the structure itself. By increasing the cross-section of the structural members to ensure that the structure has sufficient strength, stiffness and ductility, the nonlinear state of the struct...

AI Technical Summary

Problems solved by technology

In the prior art, most of the existing seismic metamaterials focus on shielding the surface waves and body waves of seismic waves. For Lamb waves generated in specific geological environments, they also carry seismic energy and destroy buildings, sometimes in seismic records. Dominant, but few seismic metamaterials can shield Lamb waves

In addition, most seismic metamaterials focus on complex configurations and multi-material systems, which pose major challenges to the practical application of seismic metamaterials.

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