自锁碳纤维布间接加固混凝土框架中节点的抗震性能

发布时间：2018-05-02 05:39

本文选题：自锁CFRP + 节点承载力　；参考：《中南大学学报(自然科学版)》2017年04期

【摘要】：通过5个加固节点试件的低周反复荷载模型试验,对自锁CFRP布间接加固混凝土框架中节点的破坏过程、承载能力、滞回曲线、延性以及耗能能力进行研究。基于混凝土结构抗震加固理论,考虑原节点核心区实际抗剪能力的修正以及梁柱端间接加固CFRP布对节点核心区抗剪能力的贡献,建立梁柱端自锁CFRP布抗震加固混凝土框架节点承载力的计算公式。研究结果表明:梁柱端自锁CFRP布间接加固技术能有效延缓纵筋在核心区的黏结滑移,避免CFRP被提前剥离破坏,明显改善节点的抗震性能,其承载能力、延性和耗能能力的提高幅度分别达到9.2%~21.6%,46.9%~61.8%和86.0%~125.0%;与增大梁柱端横向CFRP布箍配置率相比,适当增大梁端钢箍配置率或梁端纵向CFRP条带配置率对节点抗震性能的提高效果更显著;采用承载力计算公式所得计算值与试验值较吻合,该计算公式可用于实际工程中混凝土空间节点的CFRP抗震加固设计。
[Abstract]:The failure process, load-carrying capacity, hysteretic curve, ductility and energy dissipation capacity of the joints in concrete frame strengthened indirectly by self-locking CFRP sheets were studied by low-cycle repeated load model tests of five strengthened joints. Based on the theory of seismic strengthening of concrete structures, considering the modification of the actual shear capacity of the core area of the original joint and the contribution of Liang Zhu's indirect reinforcement of CFRP cloth to the shear capacity of the core area of the joint, A formula for calculating the bearing capacity of concrete frame joints strengthened by Liang Zhu self-locking CFRP sheets is established. The results show that Liang Zhu self-locking CFRP can effectively delay the slippage of longitudinal tendons in the core region, prevent CFRP from being stripped and destroyed in advance, and improve the seismic performance of joints and their bearing capacity. The increasing range of ductility and energy dissipation capacity is up to 9.2% and 46.9%, respectively, and 86.0% and 125.0%, respectively. Compared with the increase of transverse CFRP collocation rate at the end of Liang Zhu, it is more effective to improve the seismic performance of joints by properly increasing the steel hoop configuration rate at the end of the beam or the allocation rate of the longitudinal CFRP strip at the end of the beam. The calculated value of bearing capacity formula is in good agreement with the experimental value. The formula can be used in the CFRP seismic reinforcement design of concrete spatial joints in practical engineering.
【作者单位】：中南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51378507) 湖南省自然科学基金重点资助项目(09JJ3098,13JJ2005) 湖南省科技计划重点项目(2010FJ2001)~~
【分类号】：TU352.11;TU375.4

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