Impacts of soil-structure interaction on the structural control of nonlinear systems using adaptive control approach

• Published in: Engineering structures Vol. 157; pp. 1 - 13
• Main Authors: Amini, Fereidoun, Bitaraf, Maryam, Eskandari Nasab, Mohammad Seddiq, Javidan, Mohammad Mahdi
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 15.02.2018; Elsevier BV
• Subjects: Adaptive algorithms; Adaptive control; Adaptive control method; Analysis; Earthquake damage; Fragility; Fragility analysis; Model accuracy; MR damper; Nonlinear behavior; Nonlinear control; Nonlinear systems; Seismic activity; Seismic engineering; Seismic response; Semi-active control; Soil analysis; Soil-structure interaction; Soils; Structural behavior; Structural damage; Structural engineering; Adaptive control method; Soil-structure interaction; MR damper; Nonlinear behavior; Fragility analysis; Semi-active control
• ISSN: 0141-0296; 1873-7323
• DOI: 10.1016/j.engstruct.2017.11.071

•Validation shows BNWF can capture the shallow foundation behavior properly.•Performance of SAC and SSI effects was studied in-depth using fragility analysis.•The SAC algorithm can control the responses of soil-structure systems effectively.•SSI affects responses and control forces considerably which is important in design.•Neglecting SSI could completely underestimate damage to controlled structures. Though there is no doubt that soil-structure interaction (SSI) effects could significantly impact on the response of structures under seismic loads, this phenomenon is often neglected in control of structures. In the present research, the simple adaptive control (SAC) algorithm is utilized in conjunction with the magnetorheological (MR) damper to control the responses of a nonlinear structure based on soft soil analytically and the results are compared with passive-on and passive-off states. As the prototype structure is from an experimental test, a reliable framework is established by validating the accuracy of the structural model. The SSI effects are investigated from several aspects such as effects on control forces and performance of SAC in control of soil-structure systems. In addition to using conventional evaluation criteria in control problems, fragility analysis is carried out to study the structural behavior and SSI effects in-depth. It is observed that the SAC algorithm is capable of controlling the responses of structures and the outcomes are satisfying comparing to the passive approaches. The results show that neglecting SSI could completely underestimate damage to controlled structures especially structures based on soft soil and it will lead to error in the first estimation of control forces during design.