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Centralized semi-active control of post-tensioned steel frames

机译：后张紧钢框架的集中式半主动控制

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Centralized semi-active control is a technique for controlling the whole structure using one main computer. Centralized control systems introduce better control for relatively short to medium high structures where the response of any story cannot be separated from the adjacent ones. In this paper, two centralized control approaches are proposed for controlling the seismic response of post-tensioned (PT) steel frames. The first approach, the stiffness control approach, aims to alter the stiffness of the IT frame so that it avoids large dynamic amplifications due to earthquake excitations. The second approach, deformation regulation control approach, aims at redistributing the demand/strength ratio in order to provide a more uniform distribution of deformations over the height of the structure. The two control approaches were assessed through simulations of the earthquake response of semi-actively and passively controlled six-story post-tensioned steel frames. The results showed that the stiffness control approach is efficient in reducing the frame deformations and internal forces. The deformation regulation control approach was found to be efficient in reducing the frame displacements and generating a more uniform distribution of the inter-story drifts. These results indicate that centralized semi-active control can be used to improve the seismic performance of post-tensioned steel frames.
机译：集中式半主动控制是一种使用一台主计算机控制整个结构的技术。集中控制系统为相对短到中等的高层结构引入了更好的控制，在这些结构中，任何故事的响应都无法与相邻故事分开。本文提出了两种集中控制方法来控制后张式（PT）钢框架的地震响应。第一种方法是刚度控制方法，旨在改变IT框架的刚度，从而避免了由于地震激发而引起的大动态放大。第二种方法是变形调节控制方法，旨在重新分配需求/强度比，以便在结构高度上提供更均匀的变形分布。通过模拟半主动和被动控制的六层后张拉钢框架的地震响应来评估这两种控制方法。结果表明，刚度控制方法可有效减少框架变形和内力。发现变形调节控制方法在减少框架位移和产生层间漂移的更均匀分布方面是有效的。这些结果表明集中式半主动控制可用于改善后张钢框架的抗震性能。

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