Comparative Analysis of Structural Reinforcement with Viscoelastic Energy Dissipators, Friction and Metal Creep in Tall Buildings

Eddie J. Lipa, Jhon O. Pomasoncco, Joan R. Casas, R. Delgadillo
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Abstract

Seismic risk is a challenging problem in tall buildings due to the possibility of loss of human life and economic caused by seismic events. Peru is located at the interaction of the South American plate and the Nazca plate, which is why various seismic events of moderate to large magnitude occur. Today there are many ways to solve these problems and it is a very challenging case to reinforce tall buildings. In addition, technological advances in software facilitate and help through programmed models in tall buildings that analyze their structure characteristics such as drift, shear and others. This article proposes a comparative analysis of three types of dissipators: viscous fluid, friction, and metal creep through a Time-History analysis in a 15-story high-rise building located in Peru. The proposed methodology considers three stages: (i) definition of the characteristics and properties of the structure in accordance with Peruvian Standard E.030, in addition three accelerograms are used for the dynamic time-history analysis and maximum displacements and drifts are determined by ETABS software. (ii) calculate the design drift of the tall building and the properties of the viscous fluid, friction, and creep dissipator. In addition, calculations are made for the design parameters of each dissipator, and it is modeled as required for the case study. (iii) the new drifts and the damping values that the building presents for each dissipator are analyzed. According to the results obtained, the dissipator with the best results is of the flow type, since it has better performance in drifts and manages to produce an average damping of 96.87% for tall buildings. While the viscous dissipators obtain a 57.85% damping and the friction ones are estimated at 81.57%.
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高层建筑结构加固与粘弹性消能材料、摩擦和金属蠕变的对比分析
地震风险是高层建筑面临的一个挑战性问题,因为地震事件可能造成人员伤亡和经济损失。秘鲁位于南美板块和纳斯卡板块的交汇处,因此会发生各种中等至大震级的地震事件。如今,解决这些问题的方法有很多,而加固高层建筑则是一项极具挑战性的工作。此外,软件技术的进步也促进和帮助了高层建筑通过程序模型分析其结构特征,如漂移、剪切等。本文通过对位于秘鲁的一栋 15 层高层建筑进行时间-历史分析,提出了三种耗散器的比较分析方法:粘性流体、摩擦和金属蠕变。建议的方法分为三个阶段:(i) 根据秘鲁标准 E.030 确定结构的特性和属性,此外,使用三个加速度图进行动态时史分析,并通过 ETABS 软件确定最大位移和漂移。(ii) 计算高层建筑的设计漂移以及粘性流体、摩擦和蠕变耗散器的特性。此外,对每个耗散器的设计参数进行计算,并根据案例研究的要求建立模型。(iii) 分析了每个耗散器对建筑物产生的新漂移和阻尼值。根据得到的结果,效果最好的耗散器是流动型的,因为它在漂移方面有更好的表现,并能为高层建筑产生 96.87% 的平均阻尼。而粘性耗散器的阻尼为 57.85%,摩擦耗散器的阻尼估计为 81.57%。
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