Semiactive control algorithm for building structure under earthquake action by frictional damper

Abstract

The invention discloses a semiactive control algorithm for a building structure under earthquake action by a frictional damper. The steps are as follows: firstly, a structural model is selected; secondly, the structure is calculated by the linear quadrics (LQR) classic and optimal control algorithm, and the optimal controlling force during the minimum energy of the building structure is designed;thirdly, the optimal controlling force is utilized for respectively designing the real-time variable damping and the variable stiffness of the frictional damper, and therefore the semiactive frictional controlling force of the frictional damper can be obtained by the calculation and the semiactive control to the building structure is realized; and fourthly, the semiactive controlling force of thefrictional damper is utilized for controlling the building structure, and the vibratory response which is returned by the building structure under the earthquake action is collected. Indicated by theresult of the numerical experiment, the algorithm of the invention is much more effective in controlling the dynamic response of a multi-story building structure, and solves the problem of poor effectof the prior art on controlling the acceleration response of the building structure; and with the increase of storeys, the advantage on acceleration control of the building structure under the earthquake action is much more obvious.

Description

Semi-active control algorithm for friction dampers of building structures under earthquake technical field The invention relates to the field of anti-seismic technology of building engineering structures, in particular to a damper for dissipating vibration energy of building structures. Background technique At present, the friction damper is a relatively simple structure among various energy dissipation dampers widely studied at home and abroad. Its main idea is to dissipate the vibration energy of the structure through the friction force generated by the relative sliding between two solids subject to preload. It has very good superior performance for the structural control of multi-storey, high-rise and even super high-rise buildings. First of all, the friction damper can be made as a friction rod, which can be directly installed on the building structure instead of the ordinary rod, without occupying the applicable space of the building structure and not affecting the s...

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Problems solved by technology

Most of the existing semi-active variable damping friction dampers use the Semi3 semi-active control algorithm. This semi-active control algorithm has certain effects and is widely used. However, numerical simulation experiments have proved that under the action of far-field seismic waves, the control algorithm The friction damper under the structure has a poor control effect on the acceleration of the building structure, and sometimes it will increase the acceleration of the building structure

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