使用 C-FRP ROPES 加固钢筋混凝土柱及其与横梁连接的创新技术

Q1 Mathematics
Chris Karayannis, Emmanuil Golias
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引用次数: 0

摘要

实验研究了创新型 C-FRP 绳索在钢筋混凝土柱加固中的应用。为满足研究需要,制作了两个具有相同几何特征和相同钢筋的实际尺寸试样。这项研究的主要目的是调查使用 C-FRP 绳索作为外部安装的加固材料来加固存在缺陷的外部柱子的有效性。为此,(a) 将 C-FRP 绳索用作柱子的纵向加固,以提高抗弯强度;(b) 将 C-FRP 绳索用作柱子关键端部的外部约束箍筋,以提高混凝土强度并发展局部构件的延展性;最后,(c) 将 C-FRP 绳索用作 X 型对角加固形式的外部箍筋,以提高柱子与梁连接部分(连接板)的承载能力。两个试样均在相同的循环加载程序下进行测试,该程序包括七个步骤,每个步骤包括三个完整的加载循环。在第七步的三个加载周期中,加固试样的最大荷载分别比未加固试样的相应荷载高出 40%、72% 和 87%。另一方面,试验(未加固)试样的连接板在第六步和第七步的剪切变形测量值分别比加固试样高出 43% 和 44%。总之,与未加固的试验试样相比,加固后的柱子在每个加载步骤的最大荷载、耗散能量和连接面板的剪切变形方面都表现出更好的滞后响应和整体行为。特别强调的是,连接面板的剪切变形测量值和应变仪测量值证实,加固试样的支柱和连接面板几乎保持完好无损,而试验试样的支柱和连接面板则出现损坏并最终失效。此外,还强调了 C-FRP 绳索可轻松应用于结构复杂的结构中,而不受任何几何限制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An Innovative Technique for the Strengthening of RC Columns and Their Connections with Beams Using C-FRP ROPES
The application of the innovative C-FRP ropes for the strengthening of reinforced concrete columns is experimentally examined. Two real-scale specimens with the same geometrical characteristics and the same steel reinforcements were constructed for the needs of this investigation. The primary objective of the study is to investigate the efficacy of the use of C-FRP ropes as externally mounted reinforcement for the strengthening of deficient external columns. In this direction, (a) C-FRP ropes are applied as longitudinal reinforcement of the column for the increase in the flexural strength, (b) C-FRP ropes are applied as external confining stirrups in the critical end parts of the column for the improvement of the concrete strength and the development of local element ductility, and finally (c) C-FRP ropes are applied as external stirrups in the form of diagonal X-shaped reinforcement for the increase in the capacity of the part of the column connected with the beam (joint panel). Both specimens are tested under the same cyclic loading procedure that comprises seven steps and each step includes three full loading cycles. The maximum loads of the strengthened specimen at the three loading cycles of the seventh step were 40%, 72% and 87% higher than the corresponding ones of the unstrengthened specimen. On the other hand, the measured shear deformations of the joint panel of the pilot (unstrengthened) specimen at the sixth and the seventh steps were 43% and 44% higher than the corresponding ones of the strengthened specimen. In general, it is concluded that the strengthened column exhibited improved hysteretic response and the whole behavior was apparently improved compared to the pilot specimen without strengthening in terms of maximum loads per loading step, dissipated energy, and shear deformations of the joint panel. In particular, it is stressed that the measured shear deformations of the joint panel and strain gauge measurements have substantiated that the column and the connection panel of the strengthened specimen remain almost intact, whereas damage and eventually failure have been located in the column and the joint panel of the pilot specimen. Additionally, it is emphasized that the C-FRP ropes can easily be applied in structures with complex configuration without any geometrical restraints.
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来源期刊
Applied Sciences
Applied Sciences Mathematics-Applied Mathematics
CiteScore
6.40
自引率
0.00%
发文量
0
审稿时长
11 weeks
期刊介绍: APPS is an international journal. APPS covers a wide spectrum of pure and applied mathematics in science and technology, promoting especially papers presented at Carpato-Balkan meetings. The Editorial Board of APPS takes a very active role in selecting and refereeing papers, ensuring the best quality of contemporary mathematics and its applications. APPS is abstracted in Zentralblatt für Mathematik. The APPS journal uses Double blind peer review.
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