In-plane seismic performance of masonry wall retrofittedwith prestressed steel-bar truss

IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL
S. Hwang, Sanghee Kim, Keun-Hyeok Yang
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引用次数: 6

Abstract

An external prestressed steel-bar truss unit was developed as a new strengthening technology to enhance the seismic performance of an in-plane masonry wall structure while taking advantage of the benefits of a prestressed system. The presented method consists of six steel bars: two prestressed vertical bars to introduce a prestressing force on the masonry wall, two diagonal bars to resist shear deformation, and two horizontal bars to maintain the configuration. To evaluate the effects of this new technique, four full-scale specimens, including a control specimen, were tested under combined loadings that included constant-gravity axial loads and cyclic lateral loads. The experimental results were analyzed in terms of the shear strength, initial stiffness, dissipated energy, and strain history. The efficiency of the external prestressed steel-bar truss unit was validated. In particular, a retrofitted specimen with an axial load level of 0.024 exhibited a more stable post behavior and higher energy dissipation than a control specimen with an observed complete sliding failure. The four vertical bars of the adjacent retrofitting units created a virtual column, and their strain values did not change until they reached the peak shear strength. The shear capacity of the masonry wall structure with external prestressed steel-bar truss units could be predicted using the model suggested by Yang et al.
预应力钢筋桁架砌体墙面内抗震性能研究
外预应力钢筋桁架单元是一种新的加固技术,在充分利用预应力体系的优点的同时,提高了面内砌体结构的抗震性能。该方法由六根钢筋组成:两根预应力竖杆在砌体墙体上施加预应力,两根斜杆抵抗剪切变形,两根水平杆保持结构。为了评估这种新技术的效果,四个全尺寸试件,包括一个对照试件,在包括恒重力轴向载荷和循环侧向载荷的组合载荷下进行了测试。对试验结果进行了抗剪强度、初始刚度、耗散能和应变历史分析。验证了外预应力钢筋桁架单元的有效性。特别是,在轴向荷载水平为0.024的情况下,与完全滑动破坏的对照试件相比,加固后的试件表现出更稳定的后行为和更高的能量耗散。相邻改造单元的四根竖杆形成一个虚拟柱,其应变值直到达到峰值抗剪强度才发生变化。采用Yang等人提出的模型可以预测外预应力钢筋桁架砌体墙体结构的抗剪能力。
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来源期刊
Earthquakes and Structures
Earthquakes and Structures ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
2.90
自引率
20.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Earthquakes and Structures, An International Journal, focuses on the effects of earthquakes on civil engineering structures. The journal will serve as a powerful repository of technical information and will provide a highimpact publication platform for the global community of researchers in the traditional, as well as emerging, subdisciplines of the broader earthquake engineering field. Specifically, some of the major topics covered by the Journal include: .. characterization of strong ground motions, .. quantification of earthquake demand and structural capacity, .. design of earthquake resistant structures and foundations, .. experimental and computational methods, .. seismic regulations and building codes, .. seismic hazard assessment, .. seismic risk mitigation, .. site effects and soil-structure interaction, .. assessment, repair and strengthening of existing structures, including historic structures and monuments, and .. emerging technologies including passive control technologies, structural monitoring systems, and cyberinfrastructure tools for seismic data management, experimental applications, early warning and response
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