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A platform for research: civil engineering, architecture and urbanism
Optimal Placement of Active Tendons to Control Seismic Structural Response with Dual Irregularities - Mass and Stiffness
Damage susceptibility of a building having non uniform distribution of mass together with stiffness is likely to be more, should either be avoided or may be dealt with using control device. The device could be active, passive or their hybrid. In this paper, the two vertical irregularities have been considered and requirement for number and placement of active tendons are investigated. For this purpose, a ten story seismically designed regular frame is taken as a reference frame. Dual irregularities due to mass and stiffness in critical storys are introduced with the modification factors 2 and 3 in mass irregularity, and 0.50 and 0.20 in stiffness irregularity respectively. The control forces required to reduce the responses of the irregular frames obtained through linear quadratic regulator are applied to the tendons placed at their optimal locations. The optimization is used to minimize the base shear and number of tendons constraining the peak story drift and maximum floor displacement within permissible limits prescribed by earthquake code. Two far fields and two near field seismic events are considered for nonlinear analyses of the frames. Results obtained are compared and discussed. Strategy developed to reduce the responses of the frames subjected to the earthquakes is found effective for the frames with critical dual irregularities under considered earthquakes.
Optimal Placement of Active Tendons to Control Seismic Structural Response with Dual Irregularities - Mass and Stiffness
Damage susceptibility of a building having non uniform distribution of mass together with stiffness is likely to be more, should either be avoided or may be dealt with using control device. The device could be active, passive or their hybrid. In this paper, the two vertical irregularities have been considered and requirement for number and placement of active tendons are investigated. For this purpose, a ten story seismically designed regular frame is taken as a reference frame. Dual irregularities due to mass and stiffness in critical storys are introduced with the modification factors 2 and 3 in mass irregularity, and 0.50 and 0.20 in stiffness irregularity respectively. The control forces required to reduce the responses of the irregular frames obtained through linear quadratic regulator are applied to the tendons placed at their optimal locations. The optimization is used to minimize the base shear and number of tendons constraining the peak story drift and maximum floor displacement within permissible limits prescribed by earthquake code. Two far fields and two near field seismic events are considered for nonlinear analyses of the frames. Results obtained are compared and discussed. Strategy developed to reduce the responses of the frames subjected to the earthquakes is found effective for the frames with critical dual irregularities under considered earthquakes.
Optimal Placement of Active Tendons to Control Seismic Structural Response with Dual Irregularities - Mass and Stiffness
Structural Integrity
Fonseca de Oliveira Correia, José António (editor) / Choudhury, Satyabrata (editor) / Dutta, Subhrajit (editor) / Rather, Faisal (author) / Alam, Mehtab (author)
International Conference on Advances in Structural Mechanics and Applications ; 2021 ; Silchar, India
Advances in Structural Mechanics and Applications ; Chapter: 6 ; 72-84
Structural Integrity ; 19
2022-06-08
13 pages
Article/Chapter (Book)
Electronic Resource
English
Seismic response of structures with coupled vertical stiffness–strength irregularities
| Online Contents | 2012