超高性能混凝土加固受损钢筋混凝土梁受弯性能试验研究  

Experimental study on flexural behavior of damaged beams strengthened with ultra-high performance concrete

作　　者：寇佳亮[1,2] 温江 齐悦 周恒[3] KOU Jialiang;WEN Jiang;QI Yue;ZHOU Heng(School of Civil and Architectural Engineering,Xi’an University of Technology,Xi’an 710048,China;State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi’an University of Technology,Xi’an 710048,China;Northwest Engineering Corporation Limited,Power China,Xi’an 710065,China)

机构地区：[1]西安理工大学土木建筑工程学院,陕西西安710048 [2]西安理工大学省部共建西北旱区生态水利国家重点实验室,陕西西安710048 [3]中国电建集团西北勘测设计研究院有限公司,陕西西安710065

出　　处：《地震工程与工程振动》2025年第1期217-228,共12页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(52079109,51408487)。

摘　　要：为研究超高性能混凝土(ultra-high performance concrete,UHPC)加固受损试件的力学性能,共设计10根UHPC加固受损钢筋混凝土梁,通过四点弯曲性能试验,研究UHPC加固钢筋混凝土(reinforced concrete,RC)梁受弯的裂缝开展情况、破坏形态、承载能力和位移,分析了不同加固厚度、不同加固方式对UHPC加固受损RC梁的受弯性能影响。研究结果表明:UHPC加固受损RC梁的承载能力有极大的提升,峰值荷载最高提升194%;发生破坏时的裂缝较原梁数目多且发展较完全;延性较原梁有很大的提升,其中加固梁相较于原梁的位移延性系数增大了49.77%~178.31%;提出了UHPC加固混凝土梁峰值荷载计算方法及基本假定,将试验参数代入公式,结果与试验值较为吻合,表明所提出的计算公式可以有效地预测此类加固梁的峰值荷载。In order to study the mechanical properties of ultra-high performance concrete(UHPC)-reinforced damaged specimens,a total of 10 UHPC-reinforced damaged reinforced concrete beams were designed.These beams were subjected to a four-point bending performance test to study the crack development,damage pattern,load carrying capacity,and displacement of UHPC-reinforced reinforced concrete beams under bending.The effects of different reinforcement thicknesses and different reinforcement methods on the bending performance of UHPC-reinforced damaged RC beams were analyzed.The experimental study shows that the load carrying capacity of UHPC-reinforced damaged RC beams is greatly improved,and the ultimate load is improved by up to 194%.The number of cracks that occur when damage occurs is more than that of the original beams,and the development is more complete;the ductility is greatly improved compared with the original beams,and the displacement ductility coefficients of the reinforced beams are considered to be increased by 49.77%~178.31%compared with that of the original beams.The calculation method and basic assumptions of the ultimate load of the UHPC-reinforced concrete beams are proposed,and the test parameters are substituted into the formula.The results are more consistent with the test values,indicating that the proposed formula can effectively predict the ultimate load of such reinforced beams.

关 键 词：超高性能混凝土 加固试件 受弯性能 承载能力 本构模型 

分 类 号：TU375.1[建筑科学—结构工程]