Effect of Time Delay on Semi-Active Seismic Control of a Nonlinear 11-Story Building Using Floating and Predictive Fuzzy Logic Algorithm

Abstract

In control systems where sensors and receivers of sensor recorded data are used, there is a possibility of time delay in transferring recorded data of structural motion, which is a factor to reduce the efficiency of control system and even destabilization of structure. In this paper, the effect of time delay on performance of semi-active seismic control of an 11-story building with Magnetorheological (MR) damper is studied using predictive and floating fuzzy logic algorithm. Fuzzy decision-making system and linear and nonlinear model of structure are implemented in MATLAB and OpenSEES, respectively using TCP/IP connection. According to the results of incremental dynamic analysis for seven earthquakes with maximum acceleration of 0.1 to 1.0g and incremental step of 0.1g, floating fuzzy control system has improved roof displacement response of the structure by 38.75% compared to the uncontrolled system, despite time delay of 0.1s in control process and improvement roof response of the structure with linear behavior by no time delay in fuzzy control system based on velocity. In the case of time delay in control system and application of fuzzy decision making system based on roof velocity of the structure and predictive control, the average improvement of structure displacement response is 24.91% compared to uncontrolled system and it is 27.51% in the case of using floating fuzzy system. The same values in nonlinear structure are 30.81, 20.19, and 22.84%, respectively.