| Abstract: |
ABSTRACTA new point of view for the number and the placement of semi-active hydraulic dampers (SHDs) along the buildings associated with awireless sensor network and achieving high performance, is developed inthis dissertation. This proposed method depends on using a few number ofsemi-active control devices distributed along the whole building but withnew placements instead of the uniform distribution of these devices in allstories as traditional placement, which is considered very expensive andcomplex especially in high-rise buildings. The method is termed; theProposed New Placement of SHDs. In addition, a design methodology forthis proposed method is suggested to simplify its applications. Thisproposed design offers two different strategies for structural designers; toobtain overall reduction in structural responses (strategy (A)) or to havemore reduction in floor displacements with smaller reduction in total baseshear (strategy (B)). The efficiency of Proposed New Placement of SHDs,is examined firstly on the performances of low, medium, and high risebuildings, and compared to the results of the traditional case, where theSHDs and wireless sensing devices are distributed uniformly in all stories.Secondly, it is examined under different earthquake intensities using morerealistic model has material nonlinearity.The idea of this proposed placement was obtained after an extensivestudy for the efficiency of traditional placement of semi-active controldevices in the first part of this dissertation. Several semi-activelycontrolled structures were considered in this thesis gradually from one-story to sixty-story buildings. These buildings are modeled and analyzedusing the finite element program ANSYS version 10. Semi-active control11forces are derived according to the Linear Quadratic Regulator (LQR)algorithm. However, to get control force for Proposed New Placement ofSHDs some adoptions are done on inputs of LQR algorithm to beappropriated for this method. The MA TLAB control toolbox is used toget the state feedback gain matrix of LQR algorithm which is used byANSYS for proposing finite element model for SHDs and wireless sensornetwork using the control elements (COMBIN37). The accuracy of theproposed finite element model is examined throughout a verificationproblem from previous work. Three different earthquakes are usedthroughout this research to cover wide variety of ground motioncharacteristics and introduce acceptable results.Several results and conclusions are obtained, which demonstratedthat the Proposed New Placement of SHDs method, using just a fewnumber of SHDs, provides better suppression performance of structuralvibration more than the traditional placement of SHDs. Moreover, whenmaterial non linearity was considered in the analysis, this proposed methodnot only gives the best reduction in responses but also prevents collapse ofthe building under severe earthquakes, which occurs in uncontrolled andtraditional case of control with SHDs.IDforces are derived according to the Linear Quadratic Regulator (LQR)algorithm. However, to get control force for Proposed New Placement ofSHDs some adoptions are done on inputs of LQR algorithm to beappropriated for this method. The MA TLAB control toolbox is used toget the state feedback gain matrix of LQR algorithm which is used byANSYS for proposing finite element model for SHDs and wireless sensornetwork using the control elements (COMBIN37). The accuracy of theproposed finite element model is examined throughout a verificationproblem from previous work. Three different earthquakes are usedthroughout this research to cover wide variety of ground motioncharacteristics and introduce acceptable results.Several results and conclusions are obtained, which demonstratedthat the Proposed New Placement of SHDs method, using just a fewnumber of SHDs, provides better suppression performance of structuralvibration more than the traditional placement of SHDs. Moreover, whenmaterial non linearity was considered in the analysis, this proposed methodnot only gives the best reduction in responses but also prevents collapse ofthe building under severe earthquakes, which occurs in uncontrolled andtraditional case of control with SHDs.
|
|
|