删除或更新信息，请邮件至freekaoyan#163.com(#换成@)

动态压缩下混凝土应变率效应压力与横向效应的影响与校正

本站小编 Free考研考试/2021-12-21
本文二维码信息
二维码（扫一下试试看！）
动态压缩下混凝土应变率效应压力与横向效应的影响与校正
Influence and Revision of Transverse Inertia Effect and Pressure Hardening Effect on Strain-Rate Hardening Effect of Compressive Strength of Concrete
投稿时间：2018-12-25
DOI：10.15918/j.tbit1001-0645.2018.532
中文关键词:混凝土应变率效应动态压缩强度动态强化因子横向惯性效应
English Keywords:concretestrain rate effectdynamic compressive strengthdynamic increase factortransverse inertia effect
基金项目:国家自然科学基金资助项目（11772160，11472008，11202206，11402266）；爆炸科学与技术国家重点实验室基金（KFJJ18-01M）；浙江省重中之重学科开放基金项目（xklx1513）；中央高校基本科研业务费专项资金（30915118801）
作者单位
高光发1. 南京理工大学 机械工程学院, 江苏, 南京 210094

2. 北京理工大学 爆炸科学与技术国家重点实验室, 北京 100081
摘要点击次数:711
全文下载次数:309
中文摘要:
混凝土在高应变率条件下具有非常明显的应变率强化效应.然而，在动态压缩试验过程中混凝土试件内也必然存在横向惯性效应；而且由于常用的混凝土动态本构关系中应变率效应与静水压影响被假设是解耦的，因此需要对其进行归一化处理.基于试验结果，利用波动力学理论，结合数值计算，对动态压缩试验中试件内的横向惯性效应和静水压效应进行分析和校正，并给出了混凝土材料压缩强度的真实应变率强化规律.研究表明：随着试件径向尺寸与应变率的增加、材料声速和破坏应变的减小，试件的横向惯性效应愈加明显；混凝土试件压缩强度在高应变率区间的应变率强化效应非常明显，对比之下，对试件内横向惯性效应与静水压影响进行校正后的混凝土材料压缩强度的真实应变率强化效应远低于前者；在高应变率区间，混凝土材料由于其内在含孔隙与随机预损伤等结构问题应该存在应变率强化效应，但随着应变率的提高，该强化趋势会减小，直至趋于一个近似恒指.
English Summary:
The compressive strength of concrete has a significant strain-rate hardening effect under a high strain-rate loading. However, some problems, such as transverse inertia effect, should be considered even if all conditions in the test process are perfect. And the strain-rate effect and pressure hardening effect are decoupling, so the part of dynamic increase factor which is on account of the increase of pressure must be excluded. Based on previous investigation results, the transverse inertia effect and pressure hardening effect were studied through theoretical analysis and numerical simulation and the true strain-rate effect of concrete was obtained. The study results show that with the increase of the radial size and strain-rate of the specimen, the decrease of sound velocity and the fracture strain of concrete material, the transverse inertia effect is more and more obvious. Compared with the concrete specimen, the strain-rate effect of concrete material is much smaller. Concrete material is a kind of structural material which contains a mass of micro-void and randomly distributed initial damage, so it should be a strain-rate hardening material.
查看全文查看/发表评论下载PDF阅读器
相关话题/混凝土 材料 技术 实验室 科学

Free考研考试FreeKaoYan.Com
欢迎来到Free考研考试，"为实现人生的Free而奋斗"

© 2020 FreeKaoYan! . All rights reserved.