应变率与短纤维掺量对TR-HDC单轴拉伸力学性能影响试验研究  

EXPERIMENTAL STUDY ON THE EFFECTS OF STRAIN RATE AND SHORT FIBER CONTENT ON TENSILE BEHAVIOR OF TR-HDC

作　　者：董志芳 邓明科[2] 王波 高永辉 何涛 DONG Zhi-fang;DENG Ming-ke;WANG Bo;GAO Yong-hui;HE Tao(College of Architecture&Civil Engineering,Shangqiu Normal University,Shangqiu,He’nan 476000,China;School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an,Shaanxi 710055,China)

机构地区：[1]商丘师范学院建筑工程学院,河南商丘476000 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《工程力学》2024年第7期202-211,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(51878545);河南省科技攻关计划项目(222102320107,212102310944)。

摘　　要：为研究纤维织物增强高延性混凝土(TR-HDC)在不同应变率和短纤维掺量下的单轴拉伸力学性能,该文设计了25组TR-HDC薄板试件进行单轴拉伸试验,研究应变率(10^(−5) s^(−1)~10^(−1) s^(−1))和短纤维掺量(0%~2%)对TR-HDC开裂模式、破坏机理和抗拉强度的影响。结果表明:TR-HDC在单轴拉伸荷载作用下具有多缝开裂特征,随应变率的增大,试件裂缝间距略有增大趋势,同时短纤维掺量越高,多缝开裂模式越稳定;应变率和短纤维掺量增加可显著改善界面性能,抑制纤维织物的滑移失效;随应变率的提升,TR-HDC的力学性能呈现出一定的应变率敏感性,同时增加短纤维掺量,其开裂和峰值强度也呈现出显著的增长趋势。基于线性对数关系和多因素耦合提出的预测模型可统一TR-HDC静态与动态抗拉强度计算方法,为其工程应用提供了理论依据。In order to study the uniaxial tensile behaviors of textile-reinforced high ductility concrete(TR-HDC)with different strain rates and short fiber contents,25 groups of TR-HDC thin-plate specimens were designed to load through uniaxial tensile tests.The effects of strain rate(10^(−5) s^(−1)~10^(−1) s^(−1))and short fiber content(0%~2%)on the cracking mode,failure mechanism and tensile strength of TR-HDC were studied.The results showed that:TR-HDC had the multi-cracking characteristics under uniaxial tensile load.With the increase in strain rate,the crack spacing of the specimens increased slightly.A higher content of short fibers led to more stable multi-cracking mode.The increase of strain rate and short fiber content can significantly improve the interfacial properties and inhibit the slipping failure of textile.With the increase in strain rate,the mechanical properties of TR-HDC showed strain rate sensitivity.Moreover,its cracking and peak strength showed a significant growth trend with the increase of the short fiber content.Based on the linear logarithmic relationship and multi-factor coupling,the proposed prediction model can unify the static and dynamic tensile strength of TR-HDC,which provides a theoretical basis for its engineering application.

关 键 词：纤维织物 高延性混凝土 应变率 短纤维掺量 单轴拉伸 抗拉强度 

分 类 号：TU528.58[建筑科学—建筑技术科学]