Multidimensional and multipoint anti-seismic experimental method for considering soil-structure interaction

Abstract

The invention relates to a multidimensional and multipoint anti-seismic experimental method for considering soil-structure interaction, belonging to the field of anti-seismic experiments for architectural structures. The method comprises the following steps of: by taking a semi-infinite soil mass as a numerical experiment model and an architectural structure as a physical experiment model, organically combining the soil mass and an upper architectural structure by means of the transmission of interface counter force and an interface dynamic response; seamlessly connecting a soil model with the upper architectural structure by means of an optimized design of a substructure system controller; and performing a local control policy on a multi-vibrating-table system so as to realize a multi-vibrating-table based real-time dynamic substructure experiment to be used for multidimensional and multipoint anti-seismic performance experimental researches for considering the soil-structure interaction for long and large structures. The method provided by the invention greatly lowers the requirements of experimental equipment, and can be used for more comprehensively researching the anti-seismic performance influence factors of architectural structures.

Description

technical field [0001] The invention relates to an anti-seismic test method, in particular to a multi-dimensional and multi-point anti-seismic test method for considering soil-bonded interaction, and belongs to the technical field of anti-seismic tests of building structures. Background technique [0002] In 1992, the Japanese scholar Nakashima first realized the dynamic substructure experiment. The key parts or nonlinear parts of the structure were used as the physical experiment objects, and the remaining parts that were convenient for mathematical description were used as numerical models. The real-time data exchange between the two was organically combined through interface interaction. together. Compared with other existing seismic test methods, it has the following advantages: avoiding the necessity of real-time experiments on the overall structural system, thus making it possible to conduct full-scale real-time experiments on key parts of the structure under the exist...

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Problems solved by technology

[0003] From the beginning of the 20th century to the present, a large number of theoretical research results have been achieved on soil-structure dynamic interaction, but due to the limitations of equipment and methods, experimental research is still lacking.

The soil-structure dynamic interaction analysis methods can be divided into the overall method and the substructure method. The overall method test research mainly includes large-scale and small-scale scale tests. The small-scale scale test directly builds the large-scale test model on the semi-infinite soil. , this type of test can completely simulate the actual soil-structure integrated system, but it can only study the natural vibration characteristics of the structure, and cannot simulate the seismic input. The small-scale test simplifies the semi-infinite soil body into a finite boundary, and uses a certain scale soil box to simulate The actual soil, combining the structure with the soil and the structure to study the interaction, taking the whole as the test object

This type of test can simulate the actual ground motion, but it has high requirements on the size and output of the test equipment. The current experimental conditions can only be used for large-scale scale-down tests, and the radiation damping caused by the semi-infinity of the foundation cannot be considered. Even so , for long and large structures such as bridges and long-spans, it is necessary to study their performance under multi-dimensional and multi-point earthquakes, and the current test equipment is still powerless

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