Seismic retrofitting of GFRP-reinforced concrete columns using precast UHPC plates

IF 4.2 2区工程技术 Q1 ENGINEERING, GEOLOGICAL Soil Dynamics and Earthquake Engineering Pub Date : 2024-10-14 DOI:10.1016/j.soildyn.2024.109024

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Abstract

With the increasing utilization of fiber-reinforced polymer (FRP) bars in concrete structures, the issue of retrofitting damaged FRP-reinforced concrete (FRP-RC) structures will emerge. However, limited research is available on the seismic performance of damaged FRP-RC structures after retrofitting. In this study, cyclic tests were conducted to evaluate the efficiency of precast ultra-high performance concrete (UHPC) plates in retrofitting the seismic performance of GFRP-RC columns with continuous or lap-spliced GFRP bars. Three GFRP-RC columns, among which one column with lap-spliced details was strengthened with precast UHPC plates, and the other two columns were retrofitted with precast UHPC plates combined with NSM after simulated seismic damage testing. To compare the retrofitting efficiency of this method for GFRP-RC and steel-RC columns, a previous study on steel-RC columns retrofitted with UHPC was incorporated. For the pre-damaged GFRP-RC columns after retrofitting with precast UHPC plates combined with NSM, the peak load experienced an increase of 76 %–79 %, and the ductility was complete restored. The failure modes of strengthened or retrofitted GFRP-RC columns differ from those of strengthened or retrofitted steel-RC columns. Further, the flexural strength of GFRP-RC columns and beams after being strengthened or retrofitted by UHPC can be predicted well based on the cross-section analysis model.

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使用预制超高性能混凝土板对 GFRP 加固混凝土柱进行抗震改造

随着纤维增强聚合物（FRP）钢筋在混凝土结构中的应用越来越广泛，对受损的 FRP-RC 结构进行改造的问题也随之出现。然而，关于改造后受损 FRP-RC 结构抗震性能的研究还很有限。本研究进行了循环试验，以评估预制超高性能混凝土（UHPC）板在改造带有连续或搭接 GFRP 杆件的 GFRP-RC 柱抗震性能方面的效率。在三根 GFRP-RC 柱子中，一根采用搭接细节的柱子使用预制超高性能混凝土板进行加固，另外两根柱子在模拟地震破坏试验后使用预制超高性能混凝土板结合 NSM 进行改造。为了比较这种方法对 GFRP-RC 和钢-RC 柱的改造效率，还结合了之前对采用 UHPC 改造的钢-RC 柱的研究。对于预先损坏的 GFRP-RC 柱，在使用预制 UHPC 板结合 NSM 进行改造后，峰值载荷增加了 76 %-79%，延性也完全恢复。加固或改造后的 GFRP-RC 柱的破坏模式与加固或改造后的钢-RC 柱不同。此外，根据截面分析模型，可以很好地预测采用超高性能混凝土加固或改造后的 GFRP-RC 柱和梁的抗弯强度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Soil Dynamics and Earthquake Engineering 工程技术-地球科学综合

CiteScore

7.50

自引率

15.00%

发文量

446

审稿时长

8 months

期刊介绍： The journal aims to encourage and enhance the role of mechanics and other disciplines as they relate to earthquake engineering by providing opportunities for the publication of the work of applied mathematicians, engineers and other applied scientists involved in solving problems closely related to the field of earthquake engineering and geotechnical earthquake engineering. Emphasis is placed on new concepts and techniques, but case histories will also be published if they enhance the presentation and understanding of new technical concepts.