Analysis of efficiency of passive dampers in multistorey buildings
Analysis of efficiency of passive dampers in multistorey buildings
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DOI：
10.1016/j.jsv.2018.09.031
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发表时间：
2019-01-20
影响因子：
4.7
通讯作者：
Dutkiewicz, Maciej
中科院分区：
文献类型：
--
作者：
Aydin, Ersin;Ozturk, Baki;Dutkiewicz, Maciej
本研究针对地震作用下的结构，探讨黏滞阻尼器在不同振型下的最佳化设计。该结构被建模为剪切框架，并被视为线性。将阻尼器的上下限值定义为被动约束，将各层阻尼器的阻尼系数视为设计变量。在建筑中使用这些技术工具导致了成本的严重增加。因此，重要的是尽量少使用这些元素。为此，阻尼器的阻尼系数的总和被视为目标函数，并被最小化作为放置在建筑物楼层中的阻尼器的能力的指示，从而其成本。众所周知，在结构中添加阻尼器可以增加结构的阻尼比。一个新的主动约束被包括在优化问题中作为目标阻尼比。导出了计算任意模态对应的目标阻尼比值所需的公式。使用三种不同的优化算法：模拟退火，Nelder Mead和差分进化算法来解决简单的优化问题。最优设计被发现，以最小化成本函数，并提供所有的约束。在所示的数值例子中，建造周期的变化和目标阻尼比的变化对优化的影响进行了研究。利用埃尔森特罗地震（NS）记录对优化设计后的结构进行了地震反应分析，并从周期和楼层最大位移的附加阻尼比两个方面进行了检验。此外，所提出的方法找到最佳的阻尼器分布考虑前两个模式。所提出的阻尼器优化设计方法简单，是一种在不同模态特性下均能达到最优设计的方法。数值算例表明，阻尼器的最优设计可以根据设计者的约束条件的变化而改变。(C)2018爱思唯尔有限公司版权所有
In this study, optimum design of viscous dampers under different mode behaviors are investigated for structures exposed to earthquakes. The structure is modeled as a shear frame and considered as linear. The upper and lower limit values of the dampers are defined as passive constraints, while the damping coefficients of the dampers placed in each storey are considered as the design variables. The use of these technological tools in construction has caused a serious cost increase. It is therefore important to use minimum of these elements. For this reason, the sum of the damping coefficients of the dampers is regarded as the objective function and is minimized as an indication of the capacities of the dampers placed in the building stories and thus their costs. It is well known that the addition of dampers to the structure increases the damping ratio of the structure. A new active constraint is included in the optimization problem as the target damping ratio. The equation required for the calculation of the value of the target damping ratio corresponding to any mode is also derived. The simple optimization problem is solved using three different optimization algorithms: Simulated Annealing, Nelder Mead and Differential Evolution algorithms. Optimum designs are found to minimize the cost function and provide all constraints. In the shown numerical example, the effect of the variation of the building period and the changes of the target damping ratio on the optimization is investigated. Furthermore, earthquake behavior of the structure corresponding to these optimum designs is investigated using El Centro Earthquake (NS) record and examined in terms of period and additional damping ratios of the maximum displacements to the floors. In addition, the proposed method finds the optimum damper distribution considering the first two modes. The proposed optimum damper design method is very simple and it is a method which reaches the optimum designs in different mode behaviors. As a result, it has been shown in the numerical examples that the optimum damper design can be changed according to the variations of the designer's constraints. (C) 2018 Elsevier Ltd. All rights reserved.