- 摘 要
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(西安理工大學土木建筑工程學院， 西安 710048)
［摘要］提出了GFRP套管與鋼纖維砂漿復合加固損傷RC柱的復合加固方法。通過1根RC方形截面短柱和4根復合加固損傷RC方形截面短柱的軸壓試驗，研究了GFRP套管與鋼纖維砂漿復合加固損傷RC方形截面短柱的軸壓性能，分析了GFRP管厚度對復合加固柱的承載力、剛度和延性的影響。試驗結(jié)果表明：隨著GFRP管厚度的增大，復合加固柱的承載力顯著提高，GFRP管厚度對軸壓剛度影響較大，對試件的延性變形能力影響相對較弱；在其他條件相同的情況下，復合加固柱承載力的提高率隨GFRP管厚度的增大而減小。在試驗研究的基礎(chǔ)上，建立了復合加固損傷RC方形截面短柱的軸壓承載力計算公式，計算結(jié)果與試驗結(jié)果吻合良好。
［關(guān)鍵詞］GFRP套管；鋼纖維砂漿；RC柱；復合加固；損傷；軸壓性能
中圖分類號：TU398-9 文獻標識碼：A文章編號：1002-848X(2021)21-0094-06
Experimental study on the axial compression of damaged RC column strengthened with GFRP casing and steel fiber mortar
LI Zhe, XING Leyang, WANG Zhili, LEI Jiaqi, FENG Xuewei
(College of Civil Engineering and Architecture, Xi′an University of Technology, Xi′an 710048， China)
Abstract: The composite reinforcement method of damaged RC column strengthened with glass fiber reinforced plastic(GFRP) casing and steel fiber mortar was proposed. Through the axial compression test of one RC square section short column and four RC square section short columns strengthened with composite reinforcement, the axial compression performance of the damaged RC square section short column strengthened with GFRP casing and steel fiber mortar was studied, and the influence of GFRP tube thickness on the bearing capacity, stiffness and ductility of the composite reinforced column was analyzed. The test results show that the bearing capacity of composite reinforced columns is significantly improved with the increase of GFRP pipe thickness, the thickness of GFRP tube has a great influence on the axial compression stiffness and a relatively weak influence on the ductility of the specimen. Under the same conditions, the improvement rate of the bearing capacity of the composite reinforced column decreases with the increase of the thickness of the GFRP tube. On the basis of experimental study, the calculation formula of axial compression bearing capacity of composite reinforced RC square section short column was established, and the calculated results agree well with the experimental data.
Keywords:glass fiber reinforced plastic casing； steel fiber mortar； reinforced concrete column； composite reinforcement； damage； axial compression performance
*國家自然科學基金資助項目(51608441)，陜西省自然科學基金(2019JM-193)。
作者簡介：李哲，博士，教授，碩士生導師，Email:lizhe009@163.com。
