Method for controlling torsion of base isolation structure

Abstract

The invention provides a method for controlling torsion of a base isolation structure. A displacement ratio, a ratio of a torsion component to a translational motion component and a torsion shearing force ratio are taken as torsional effect indexes, torsional effect index values are acquired and adjusted to accord with limit values, and accordingly, torsion of the base isolation structure of a complicated and irregular system is controlled. The method specifically comprises steps as follows: a three-dimensional finite element model of an irregular to-be-isolated system is established, isolation support parameters are determined in combination of a limiting value of the offset distance between the center of rigidity and the center of mass of an isolation layer, an isolation structure model is established, the torsional effect index values are extracted, whether the torsional effect index values meet the requirements of limit values is judged, a corresponding technical route is adopted according to the ultralimit condition, and finally, the torsional effect index values can all meet the requirements. According to the method, as for the complicated and irregular isolation structure, an effective torsion effect index and a specific implementation method are provided quantitatively, quantitative standards and specific operation standards are provided for an isolation technology for controlling torsion of the structure, and larger application and promotion values are provided.

Description

technical field [0001] The invention belongs to the technical field of structural engineering, and in particular relates to a method for controlling the torsion of a base shock-isolation structure. Background technique [0002] With economic development and technological progress, society has higher and higher requirements for architectural art, and a large number of irregular structural systems have emerged. The center of mass and the center of stiffness of irregular structures do not coincide. Such structures will produce torsional effects coupled with translational responses under earthquakes. The research results and previous earthquake damages show that the torsional response of structures will accelerate the damage of structures, and even become the main factor causing structural damage. [0003] In traditional technology, in order to reduce the torsional effect of the structure, the conventional method is to add shear walls or diagonal bracing members at the weak par...

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a method for controlling the torsion of base-isolation structures, with the purpose of solving the problem of torsion effects in complex and irregular systems due to the lack of a set of effective torsion effect indicators and a set of effective implementation methods in current base-seismic isolation technology. The application and popularization of the control is extremely slow; at the same time, it also solves the problem of adding shear walls or diagonal bracing members in the weak parts of the rigidity in the traditional technology, increasing the structural rigidity and increasing the seismic action absorbed by the structure, and magnifying the difficulty of seismic safety control of the whole structure Problems with economic cost

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