钢纤维高强混凝土二桩承台受力特性有限元分析  

Finite element analysis on mechanical behavior of steel fiber high strength concrete two-pile caps

作　　者：邱宏禧 陈子夏 张熙 QIU Hongxi;CHEN Zixia;ZHANG Xi(Water Conservancy College,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Guang Dong YSD Surveying and Designing Company,Foshan 528000,China)

机构地区：[1]华北水利水电大学水利学院,河南郑州450046 [2]广东粤水电勘测设计有限公司,广东佛山528000

出　　处：《水利水电快报》2024年第1期64-69,共6页Express Water Resources & Hydropower Information

摘　　要：为进一步研究钢纤维高强混凝土二桩承台内部传力机理,在钢纤维高强混凝土二桩承台模型试验的基础上,考虑混凝土塑性损伤模型(CDP),利用ABAQUS进行钢纤维高强混凝土二桩承台的受力特性分析,并与试验结果对比,阐明竖直荷载作用下承台的破坏形态、开裂荷载和极限荷载,以及承台钢筋和混凝土的应力变化特征,并在此基础上探究承台的传力机理。结果表明:二桩承台破坏形态的有限元分析结果与承台试验结果吻合较好;随着承台厚度和钢纤维体积率的增加,二桩承台承载力显著提高;选用合适的配筋率和钢纤维高强混凝土可有效提高承台承载力;钢纤维高强混凝土二桩承台传力机理符合“拉杆拱”模型。To further study the internal force transfer mechanism of Steel Fiber High Strength Concrete(SFHSC)two-pile caps based on the model test,considering the concrete plastic damage model(CDP),finite element analysis software ABAQUS was used to analyze the mechanical performance of SFHSC two-pile caps,and the calculated results were compared with the test results to clarify the failure mode,cracking load and ultimate load of the caps under vertical load,as well as the stress variation characteristics of the steel bars and concrete of the caps.On this basis,the force transfer mechanism of the caps were explored.The results showed that the finite element analysis results of the failure mode was in good agreement with the experimental results.The increase of the thickness and the steel fiber volume can improve the bearing capacity of two-pile caps significantly.With the proper steel ratio and SFHSC,the bearing capacity of two-pile caps can be improved.The transfer mechanism of SFHSC two-pile caps can accord with the tie-arch model.

关 键 词：二桩承台 钢纤维高强混凝土 ABAQUS 受力性能 

分 类 号：TV431.3[水利工程—水工结构工程]