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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

38卷

期数:

2021年04期

页码:

44-56

栏目:

出版日期:

2021-07-15

文章信息/Info

Title:

Experimental Investigation and Numerical Simulation of Interface Bonding Behavior of UHPC-NC Composite Beam

文章编号:

1673-2049(2021)04-0044-13

作者:

许建明,陈 勇,刘骁繁,许 奇

(国网江苏省电力有限公司建设分公司,江苏 南京 210036)

Author(s):

XU Jian-ming, CHEN Yong, LIU Xiao-fan, XU Qi

(Construction Branch of State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210036, Jiangsu, China)

关键词:

UHPC-NC;  界面黏结性能;  静载试验;  损伤梯度;  胶结-摩擦耦合

Keywords:

UHPC-NC;  interface bonding behavior;  static load test;  gradient-enhanced damage;  cohesive-friction coupling

分类号:

TU973.2

DOI:

10.19815/j.jace.2020.11007

文献标志码:

A

摘要:

对3根不同厚度比的超高性能混凝土-普通混凝土(UHPC-NC)叠层梁的静力行为与界面黏结性能进行了试验研究,观测到试验梁的最终破坏发生在界面处,说明UHPC-NC界面处的性能对叠层构件整体受力行为有显著影响,为此改进了现有的界面斜剪试验,使之更加准确地测量UHPC-NC界面的抗剪力学性能; 建立了可靠的UHPC-NC叠层梁二维有限元模型,采用局部损伤梯度模型模拟UHPC和NC材料的损伤,并创新性地将胶结作用力与摩擦作用力平滑地结合起来,开发了胶结和摩擦耦合模型来模拟UHPC-NC界面的破坏行为。结果表明:基于微观力学的胶结力与摩擦耦合模型可以有效模拟叠层梁的界面行为,且正则化操作能够有效提高模型计算过程中的稳定性; 有限元模型所得到的分析计算结果与叠层梁的加载试验结果接近; 有限元模型的分析计算结果体现了界面法向与切向应力的变化,为相关的界面行为研究提供了参考; UHPC-NC的界面强度性能至关重要,在某种程度上将决定叠层构件的受力行为,值得进一步地探讨与研究。

Abstract:

Three ultra-high performance concrete-normal concrete(UHPC-NC)composite beams with various thickness ratios were tested to study the static behavior and interface bonding behavior, and the final failure of the specimens occurred at the interface, which showed that the properties of UHPC-NC interface had a significant impact on the overall mechanical behavior of composite members. Then the standard slant shear test was improved to measure the shear mechanical behavior of UHPC-NC interface more accurately. A reliable two-dimensional finite element model of UHPC-NC composite beam was constructed. The local damage gradient model was used to simulate the damage of UHPC and NC materials, and the cementation force and friction force were combined smoothly. The coupling model of cementation and friction was developed to simulate the failure behavior of UHPC-NC interface. The results show that the coupling model of cementation force and friction based on micromechanics can effectively simulate the interface behavior of composite beams, and the regularization operation can effectively improve the stability of the model calculation process. The analysis and calculation results of the finite element model are close to the loading test results of composite beams. The analysis and calculation results of the finite element model reflect the changes of the normal and tangential stresses of the interface, which provides a reference for the research of interface behavior. The interface strength performance of UHPC-NC is very important, and it will determine the mechanical behavior of composite components to some extent, which is worthy of further discussion and research.

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备注/Memo

备注/Memo:

收稿日期:2020-11-03
基金项目:国网江苏省电力工程咨询有限公司科技项目(J202002)
作者简介:许建明(1973-),男,湖南武进人,研究员级高级工程师,E-mail:xjm@jsepc.com.cn。

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更新日期/Last Update: 2021-07-10