The Effect of CFRP Application on the Strength and Dynamic Characteristic of Unreinforced Masonry Wall

IF 1.7 4区 工程技术 Q3 ENGINEERING, CIVIL
Adamou Marou Seyni Samberou, Şevket Ateş, Barbaros Atmaca
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Abstract

This paper presents the results of experimental and analytical investigations of an unreinforced masonry wall (URM) exposed to continuous tensile-compressive cyclic loading. For the experimental investigation, a sample masonry wall (SMW) was designed inside a rectangular steel frame carried by pinned supports and built over a distance of 1200 mm in length by 1500 mm in height. The SMW was made of bricks whose dimensions were 285 mm × 185 mm × 130 mm. Under the influence of cyclic loading, damages appeared as diagonal or scattered cracks. The SMW was retrofitted by using carbon fiber-reinforced polymer (CFRP). An epoxy resin-based product and layers of CFRP were placed on the damaged SMW according to the crack patterns to acquire better recovery, effective strengthening, and enhanced performance. The retrofitted SMW underwent the same cyclic loading to obtain the effects of CFRP on the load–displacement capacity of the damaged masonry wall. Furthermore, an operational modal analysis test was conducted over SMW (the undamaged, the undamaged and retrofitted with CFRP) to determine their real dynamic characteristics. For analytical investigations, finite element analysis (FEA) was implemented in ABAQUS software with a simplified micro-modeling approach and damages were considered only in terms of displacement in this work. Nonlinear cyclic analysis was performed to obtain crack patterns and displacements. To determine modal parameters such as mode shapes and frequencies, modal analysis was also conducted. The obtained results such as displacements, damage patterns and modal parameters from analytical investigations were compared with experimental investigations. In the comparison of analytical and experimental studies, the results showed that the dynamic characteristics such as mode shapes and natural frequencies of SMW were changed. The use of CFRP increased up to 36% of the frequencies of the damaged sample wall. Furthermore, the shear strength capacity of SMW retrofitted by CFRP was significantly increase.

Abstract Image

应用 CFRP 对非加固砌体墙体强度和动态特性的影响
本文介绍了对承受连续拉伸-压缩循环荷载的非加固砌体墙(URM)进行实验和分析研究的结果。在实验研究中,设计了一个砌体样墙(SMW),它位于一个由销轴支撑的矩形钢架内,长 1200 毫米,高 1500 毫米。样板墙由砖块砌成,尺寸为 285 mm × 185 mm × 130 mm。在循环荷载的影响下,损坏表现为对角线裂缝或分散裂缝。通过使用碳纤维增强聚合物(CFRP)对 SMW 进行了改造。根据裂纹形态在受损的 SMW 上铺设环氧树脂基产品和 CFRP 层,以获得更好的恢复、有效的强化和更高的性能。加固后的 SMW 承受了相同的循环荷载,以了解 CFRP 对受损砌体墙荷载-位移能力的影响。此外,还对 SMW(未损坏、未损坏和加装 CFRP 的 SMW)进行了运行模态分析测试,以确定其实际动态特性。在分析研究中,采用简化的微观建模方法在 ABAQUS 软件中实施了有限元分析(FEA),在这项工作中仅考虑了位移方面的损坏。进行非线性循环分析以获得裂纹模式和位移。为了确定模态参数,如模态振型和频率,还进行了模态分析。分析研究获得的位移、破坏模式和模态参数等结果与实验研究进行了比较。在分析和实验研究的比较中,结果显示 SMW 的动态特性(如模态振型和固有频率)发生了变化。使用 CFRP 后,受损样墙的频率增加了 36%。此外,使用 CFRP 加固的 SMW 的抗剪强度能力也显著提高。
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来源期刊
CiteScore
3.30
自引率
11.80%
发文量
203
期刊介绍: The aim of the Iranian Journal of Science and Technology is to foster the growth of scientific research among Iranian engineers and scientists and to provide a medium by means of which the fruits of these researches may be brought to the attention of the world’s civil Engineering communities. This transaction focuses on all aspects of Civil Engineering and will accept the original research contributions (previously unpublished) from all areas of established engineering disciplines. The papers may be theoretical, experimental or both. The journal publishes original papers within the broad field of civil engineering which include, but are not limited to, the following: -Structural engineering- Earthquake engineering- Concrete engineering- Construction management- Steel structures- Engineering mechanics- Water resources engineering- Hydraulic engineering- Hydraulic structures- Environmental engineering- Soil mechanics- Foundation engineering- Geotechnical engineering- Transportation engineering- Surveying and geomatics.
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