Plastic energy evaluation of bilinear SDOF systems with fluid viscous dampers

IF 1.8 3区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Structural Design of Tall and Special Buildings Pub Date : 2023-03-20 DOI:10.1002/tal.2011

Mohammed Samier Sebaq, Ying Zhou, G. Song, Yi Xiao

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Abstract

Current seismic practices are more concerned with dissipating a significant portion of seismic input energy than with lateral load resistance, as well as with determining seismic demands of structures using response spectra. This study aims to improve the knowledge of the plastic energy spectra ( EP ) of single‐degree‐of‐freedom systems (SDOF) equipped with fluid viscous dampers (FVDs). This type of dampers is characterized by its supplemental damping ratio ξadd and velocity power α . Using nonlinear dynamic analyses, the EP and its ratio to the input energy ( EP/EI ) are determined using near‐field‐pulse, near‐field‐non‐pulse and far‐field ground motions. Parametric studies are conducted to investigate the effect of ground motion types, original system features and FVD characteristics on EP/EI spectra. The results show that ground motion types have a considerable influence on the EP/EI for systems with FVDs, while they are not effective for systems without FVDs. Increasing FVD nonlinearity (decreasing α) is more effective to reduce the EP/EI under near‐field‐non‐pulse and far‐field motions than under near‐field‐pulse ground motions for structures with Tn > 1 s. The paper further developed a prediction equation for estimating EP/EI for SDOF systems without and with FVDs, which can serve as a useful tool to analyse structural damage for energy‐based seismic design.

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具有流体粘性阻尼器的双线性SDOF系统的塑性能评估

当前的抗震实践更关心的是耗散相当大一部分的地震输入能量，而不是横向荷载阻力，以及使用反应谱确定结构的抗震需求。本研究旨在提高对配备流体粘性阻尼器（FVD）的单自由度系统（SDOF）的塑性能谱（EP）的认识。这种类型的阻尼器的特点是其附加阻尼比ξadd和速度功率α。使用非线性动力学分析，使用近场脉冲、近场非脉冲和远场地面运动来确定EP及其与输入能量的比率（EP/EI）。通过参数研究，研究了地面运动类型、原始系统特征和FVD特征对EP/EI谱的影响。结果表明，对于有FVD的系统，地面运动类型对EP/EI有相当大的影响，而对于没有FVD的体系，它们并不有效。对于Tn>的结构，增加FVD非线性（降低α）在近场非脉冲和远场运动下比在近场脉冲地面运动下更有效地降低EP/EI 1. s.本文进一步发展了一个预测方程，用于估计无FVD和有FVD的SDOF系统的EP/EI，该方程可以作为基于能量的抗震设计中分析结构损伤的有用工具。

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来源期刊

Structural Design of Tall and Special Buildings 工程技术-工程：土木

CiteScore

5.30

自引率

4.20%

发文量

审稿时长

6-12 weeks

期刊介绍： The Structural Design of Tall and Special Buildings provides structural engineers and contractors with a detailed written presentation of innovative structural engineering and construction practices for tall and special buildings. It also presents applied research on new materials or analysis methods that can directly benefit structural engineers involved in the design of tall and special buildings. The editor''s policy is to maintain a reasonable balance between papers from design engineers and from research workers so that the Journal will be useful to both groups. The problems in this field and their solutions are international in character and require a knowledge of several traditional disciplines and the Journal will reflect this. The main subject of the Journal is the structural design and construction of tall and special buildings. The basic definition of a tall building, in the context of the Journal audience, is a structure that is equal to or greater than 50 meters (165 feet) in height, or 14 stories or greater. A special building is one with unique architectural or structural characteristics. However, manuscripts dealing with chimneys, water towers, silos, cooling towers, and pools will generally not be considered for review. The journal will present papers on new innovative structural systems, materials and methods of analysis.