预应力CFRP板加固混凝土梁力学破坏模式研究

发布时间：2018-01-31 23:33

本文关键词： 预应力碳纤维板加固混凝土力学性能　出处：《建筑结构》2017年21期 　论文类型：期刊论文

【摘要】：预应力CFRP板加固混凝土梁技术对其锚固件研究较多,而对其加固效果和破坏荷载下的力学模式缺乏数据分析。通过对空心板原型梁按比例缩小后制作3根混凝土实心模型梁,在预压和预应力CFRP板加固后考察不同荷载下梁的力学性能、破坏形态及裂缝发展。结果表明,该加固方法能有效地限制裂缝发展,提高混凝土梁承载力;加固件在较小荷载下符合平截面假定,预应力CFRP板和混凝土梁协同工作,随荷载增加,应变先减小后增大;施加的预应力使梁体应力重新分布,钢筋应力和构件变形都减小;理论计算与模型试验比较表明加固后梁体存在较大的安全储备。
[Abstract]:There are many researches on the Anchorage of prestressed CFRP slab reinforced concrete beam. However, there is a lack of data analysis on the reinforcement effect and mechanical mode under the failure load. Three concrete solid model beams are made by scaling down the prototype beams of hollow slabs. The mechanical properties, failure patterns and crack development of beams under different loads were investigated after preloading and prestressed CFRP slab reinforcement. The results show that the strengthening method can effectively limit the crack development and improve the bearing capacity of concrete beams. The prestressing CFRP slab and concrete beam work together under small load, and the strain decreases first and then increases with the increase of load. The stress of the beam is redistributed and the stress of the steel bar and the deformation of the member are reduced by the applied prestressing force. The comparison between theoretical calculation and model test shows that there is a large safety reserve in the strengthened beam.
【作者单位】：西安公路研究院;
【基金】：陕西省交通运输厅科技项目“预应力CFRP板加固技术在混凝土桥梁中的推广应用研究”(项目编号13-33T)
【分类号】：TU375.1
【正文快照】： 0引言预应力CFRP板具有抗拉强度高、施工方便、自重轻、抗腐蚀性及耐久性好等优点,在结构修复工程中日益广泛被应用。国内外研究人员都积极开展了相关研究工作[1-3]。预应力CFRP板施工工艺,目前主要包括反拱法、不设锚具的外部反力架张拉法、端锚加固法这3种[4],能够适合加固

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