NC-UHPC界面抗剪性能试验及基于内聚力模型的仿真分析

打开文本图片集

中图分类号：U454 文献标志码：A 文章编号： 1000-5013（2025）04-0400-1C

NC-UHPC Interface Shear Performance Test and Simulation Based on Cohesive Zone Model

HUANG Wei1'²，WANG Ting1'²， ZHANG Yuting 1，2 ，SIBINUER·Xiamuxinu1'²，ZHOU Zhi³

（1.Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics， Wuhan University of Technology，Wuhan 430070，China；2. Department of Mechanics and Engineering Sciences，Wuhan University of Technology，Wuhan 43007o，China;3．School of Transportation and Logistics Engineering，Wuhan Universityof Technology，Wuhan 430o7o，China）

Abstract：To investigate the shear mechanism at the interface between ultra-high performance concrete （UHPC） and normal concrete （NC），nine groups of double-sided shear tests were conducted on NC-UHPC specimens，the effects of steel fiber content，concrete age，and boundary constraint conditions on interfacial mechanical properties were studied. Combining with ABAQUS software，a refined finite element model considering interfacial bond-slipcharacteristics was established，and an interfacial bond stress distribution model was constructed through theoretical derivation. The results show that under unrestrained conditions，specimens with low steel fiber content （0%-1% volume fraction） exhibit single-surface failure characteristics，while fixing the botom of theNC blocks efectively activatesa dual-surface failure mode.The steel fiber content in UHPC positively correlates with the interfacial shear strength，while the interfacial stiffness is lessaffected by the steel fiber content.The increase of UHPC age enhances interfacial stifess，while higher NC age has the inhibitory effect.The proposed finiteelement model effectively simulates the damage evolutionatthe interface， but simulates the asymmetric strain field in double-shear specimens with limitations.Based on the principle of energy conservation，the two-parameter model of interfacial load-displacement is established，and its prediction results conforms well with the test data.

Keywords：NC-UHPC interface；pushout test；digital image correlation；finite element；cohesive zone model

由于普通混凝土（NC）与超高性能混凝土（UHPC）界面强度的影响因素众多且复杂，从上个世纪至今，国内外众多学者进行了大量的研究，但至今仍存在可进一步深究的部分，如界面处理方式、界面粘结方式的参数影响规律、界面粘结机理等方面。（剩余10020字）