超高性能混凝土加固钢筋混凝土梁受弯性能研究  

Bending performance of RC beams reinforced with UHPC

作　　者：常跃 黄俊旗[1,2] 种迅[1,2] 赵猛 蒋庆[1,2] 冯玉龙 CHANG Yue;HUANG Junqi;ZHONG Xun;ZHAO Meng;JIANG Qing;FENG Yulong(School of Civil Engineering,Hefei University of Technology,Hefei 230009,China;Anhui Provincial Key Lab of Civil Engineering Structures and Materials,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学土木与水利学院,合肥230009 [2]合肥工业大学土木工程结构与材料安徽省重点实验室,合肥230009

出　　处：《振动与冲击》2024年第11期288-296,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(52208158);安徽省自然科学基金(2208085QE172)。

摘　　要：超高性能混凝土(ultra-high performance concrete, UHPC)由于较高的强度和耐久性可作为理想的加固材料。首先基于已有试验结果,研究了可合理考虑加固层和混凝土梁接触面间黏聚力接触的UHPC加固钢筋混凝土梁精细有限元模型建模方法。在此基础上,建立了162个加固梁的有限元模型进行了数值模拟分析,研究了不同加固筋截面积、加固层厚度以及加固层有无拼缝等关键参数对构件破坏模式和承载力的影响规律。研究结果表明:考虑黏聚力接触的数值模型可以较好地模拟UHPC加固钢筋混凝土梁的受弯性能;加固层厚度与加固筋截面积均会影响试件破坏模式与承载力提升幅度,但对于含拼缝试件,加固层厚度对上述性能影响较小。Ultra-high performance concrete(UHPC)can be an ideal reinforcement material due to its higher strength and durability.Here,firstly,based on existing test results,a refined finite element modeling method for RC beam reinforced with UHPC reasonably considering cohesive force contacting on contact surface between UHPC layer and RC beam was studied.Then,finite element models of 162 RC beams reinforced with UHPC were established for numerical simulation analysis,and effects of key parameters of cross-sectional area of reinforcement bar,thickness of reinforcement layer and reinforcement layer with/without splicing joint on component failure mode and load-bearing capacity were studied.The study results showed that the numerical model considering cohesive force contacting can better simulate bending performance of RC beams reinforced with UHPC;both thickness of UHPC layer and cross-sectional area of reinforcement bar can affect specimens’failure mode and increase in load-bearing capacity;for specimens with splicing joints,reinforcement layer thickness has a smaller impact on performances mentioned above.

关 键 词：超高性能混凝土(UHPC) 钢筋混凝土梁 抗弯性能 数值模拟 

分 类 号：TU375.1[建筑科学—结构工程]