An arch-type variable-stiffness energy-dissipating and shock-absorbing underground structure and its construction method

Abstract

The invention relates to an arch-type variable stiffness energy-dissipating shock-absorbing underground structure and a construction method, which belong to the field of underground structure shock-absorbing technology. The structure includes an arched frame, active variable stiffness device, high damping rubber interlayer and anchor cables; the arched frame includes columns, continuous beams, steel pipe arches, support columns on the arch, rigid pads, fixed pulleys and sensors; The rigidity device includes a square outer cylinder, a rectangular sliding block, a shape memory alloy wire and a rope tightener; the top surface of the rigid pad is aligned with the centroid of the bottom surface of the square outer cylinder and welded, and the gap between the column and the soil is filled with a high-damping rubber separator. One end of the anchor cable passes through the fixed pulley and the support column on the arch and is welded to the rope tightener, and the other end passes through the column and the high damping rubber interlayer and is anchored in the stable soil layer. Utilizing the shape memory effect of the martensitic phase transformation of the shape memory alloy, and working together with the high damping rubber interlayer, it actively adds stiffness to the frame structure, avoids the resonance between the underground structure and the soil, and makes the underground structure have better seismic performance.

Description

technical field [0001] The invention relates to the technology of energy-consuming and shock-absorbing underground structures, and belongs to the technical field of shock-absorbing underground structures. Background technique [0002] Earthquake disasters are characterized by randomness, suddenness, and uncertainty. Post-disaster investigations show that underground structures will be severely damaged under strong earthquakes, and due to the special properties of underground structures, once an earthquake occurs, not only Rescue is difficult, and it may affect its adjacent ground structures; when rebuilding after a disaster, the underground structure itself is difficult and expensive to repair. Therefore, improving the seismic performance of underground structures is an important part of underground engineering design. [0003] In recent years, with the acceleration of economic development and urbanization, urban land use has become more and more tense, and the development ...

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Problems solved by technology

However, these methods achieve the expected damping purpose through passive control, which are only suitable for narrow operating frequency bands, and do not have a good damping effect under conditions such as wider operating frequency bands or possible random shocks, so it is necessary to overcome For the above shortcomings, it is necessary to make the underground structural components adaptively and actively adjust their working parameters according to changes in the external environment

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