华南理工大学学报(自然科学版) ›› 2025, Vol. 53 ›› Issue (2): 107-114.doi: 10.12141/j.issn.1000-565X.240124

• 土木建筑工程 • 上一篇    下一篇

两种加固方式下震损木框架的抗侧移性能

曹纪兴1, 韩梦凡2, 包超2, 何海杰3, 刘应扬4   

  1. 1.浙江大学 建筑工程学院,浙江 杭州 310058
    2.宁夏大学 土木与水利工程学院,宁夏 银川 750021
    3.台州学院 建筑工程学院,浙江 台州 318000
    4.郑州大学 土木工程学院,河南 郑州 450001
  • 收稿日期:2024-03-14 出版日期:2025-02-25 发布日期:2025-02-03
  • 通信作者: 何海杰(1987—),男,博士,副教授,主要从事混凝土结构研究。 E-mail:11312013@zju.edu.cn
  • 作者简介:曹纪兴(1991—),男,博士,研究员,主要从事木结构和健康监测研究。E-mail: cao.cee@outlook.com
  • 基金资助:
    国家自然科学基金项目(523680440);宁夏回族自治区重点研发计划项目(2021BEG03022);宁夏自然科学基金优秀青年项目(2023AAC05015)

Lateral Resistance Performance of Damaged Timber Frames with Two Reinforcement Methods

CAO Jixing1, HAN Mengfan2, BAO Chao2, HE Haijie3, LIU Yingyang4   

  1. 1.College of Civel Engineering and Architecture,Zhejiang University,Hangzhou 310058,Zhejiang,China
    2.School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,Ningxia,China
    3.School of Architectural Engineering,Taizhou University,Taizhou 318000,Zhejiang,China
    4.School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China
  • Received:2024-03-14 Online:2025-02-25 Published:2025-02-03
  • Contact: 何海杰(1987—),男,博士,副教授,主要从事混凝土结构研究。 E-mail:11312013@zju.edu.cn
  • About author:曹纪兴(1991—),男,博士,研究员,主要从事木结构和健康监测研究。E-mail: cao.cee@outlook.com
  • Supported by:
    the National Natural Science Foundation of China(52368044);the Key Research and Development Program of Ningxia(2021BEG03022);the Outstanding Youth Program Natural Science Foundation of Ningxia(2023AAC05015)

摘要:

纤维增强聚合物加固法和自攻螺钉加固法是木结构加固方法中常用的两种加固方法,目前对于加固胶合木结构的研究多集中在加固后强度方面的变化,抗侧力性能的研究数据偏少,且对于加固震损胶合木框架的研究有限。为研究采用不同方式加固的震损胶合木框架的抗侧力性能,分别对两榀震损胶合木框架采用碳纤维增强聚合物和自攻螺钉进行加固,并增设隅撑,采用水平往复荷载对试件进行加载,对获得的试验结果进行对比分析。试验结果表明:两种加固方法均能有效避免木框架构件顺纹劈裂;与自攻螺钉加固试件相比,碳纤维布加固试件的初始刚度和最大承载能力的提高更加显著,更能抑制裂缝的发展;两榀框架的滞回曲线均呈较饱满的反“S”型,具有明显的捏缩效应。在试验数据的基础上,利用软件Open Sees建立了两榀加固震损胶合木框架的简化模型,并根据试验数据对模型进行校准。校准后的模型得出的滞回曲线与试验滞回曲线吻合良好,验证了模型的准确性和合理性,为进一步的参数分析奠定了基础。基于校准后的简化模型,重点研究分析了重力荷载对加固胶合木框架弹性刚度和最大承载力的影响,发现重力荷载对加固胶合木框架的抗侧力性能有着不可忽视的影响,为加固后的震损胶合木框架提供了科学的参数化分析。

关键词: 震损木框架, 纤维增强聚合物加固, 自攻螺钉加固, 滞回曲线, 参数分析

Abstract:

Fiber-reinforced polymer (FRP) reinforcement and self-tapping screw reinforcement are two commonly used methods for strengthening timber structures. Currently, research on reinforced glued laminated timber (glulam) structures primarily focuses on changes in strength after reinforcement, with relatively limited data on lateral resistance performance. Moreover, studies on reinforcing earthquake-damaged glulam frames are scarce. To investigate the lateral resistance performance of earthquake-damaged glued laminated timber (glulam) frames reinforced using different methods, two earthquake-damaged glulam frames were strengthened separately with carbon fiber-reinforced polymer (CFRP) and self-tapping screws, along with the addition of diagonal braces. The specimens were subjected to horizontal cyclic loading, and the experimental results were compared and analyzed. The test results indicate that both reinforcement methods effectively prevented the longitudinal splitting of the timber. However, compared to the specimen reinforced by self-tapping screw, the specimen reinforced by fiber-reinforced polymer shows significantly higher initial stiffness and peak load-carrying capacity, which can better suppress the development of cracks. The hysteretic curves of both frames exhibit a relatively anti “S” shape, with an obvious pinching effects. On the basis of the tests, simplified models of two frames were established using Open Sees. The models were calibrated based on experimental data. The hysteretic curves obtained from the calibrated models were in good agreement with the experimental results, verifying the accuracy and rationality of the model and laying the foundation for further parameter analysis. Furthermore, the influence of gravity loading for the specimens on the elastic stiffness and the maximum loading capacity was also investigated. It indicates that gravity load has an undeniable impact on the lateral resistance performance of timber frames, providing a scientific parameterized analysis for the seismic damage of reinforced timber frames.

Key words: damaged timber frame, fiber-reinforced polymer reinforcement, self-tapping screw reinforcement, hysteresis curve, parameter analysis

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