[1]洪锦祥,缪昌文,刘加平,等.基于弯曲比例极限的单个试件抗折强度预测方法[J].东南大学学报(自然科学版),2010,40(2):357-361.[doi:10.3969/j.issn.1001-0505.2010.02.027]
 Hong Jinxiang,Miao Changwen,Liu Jiaping,et al.Method for predicting flexural strength of single concrete specimen based on flexural proportional limit[J].Journal of Southeast University (Natural Science Edition),2010,40(2):357-361.[doi:10.3969/j.issn.1001-0505.2010.02.027]
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基于弯曲比例极限的单个试件抗折强度预测方法()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
40
期数:
2010年第2期
页码:
357-361
栏目:
材料科学与工程
出版日期:
2010-03-20

文章信息/Info

Title:
Method for predicting flexural strength of single concrete specimen based on flexural proportional limit
作者:
洪锦祥1 缪昌文12 刘加平1 万赟1
1 江苏省建筑科学研究院, 南京 210008; 2 东南大学材料科学与工程学院, 南京 210096
Author(s):
Hong Jinxiang1 Miao Changwen12 Liu Jiaping1 Wan Yun1
1 Jiangsu Architectural Research Institute, Nanjing 210008, China
2 School of Materials Science and Engineering, Southeast University, Nanjing 210096, China
关键词:
弯曲比例极限 抗折强度 预测方法
Keywords:
flexural proportional limit flexural strength predicting method
分类号:
TU502.6
DOI:
10.3969/j.issn.1001-0505.2010.02.027
摘要:
为提高混凝土单个试件抗折强度的预测精度,分析了弯曲应力下变形曲线和弯曲比例极限的特性,阐述了基于弯曲比例极限预测单个试件抗折强度的原理和方法.弯曲应力-应变曲线具有在比例极限荷载处由线性向非线性转变的特征,在不破坏试件的前提下,对试件进行逐级加载至比弯曲比例极限荷载大1~2 kN,根据应变增量的变化可确定该试件的弯曲比例极限荷载,且该试验不会对试件造成损伤.相同配合比混凝土的弯曲比例极限基本为常数且其变异性比抗折强度小,同配合比混凝土的弯曲比例极限平均值可作为每个试件弯曲比例极限的预估值,将弯曲比例极限荷载除以比例极限平均值即可预估试件的抗折强度.该方法能显著提高单个试件抗折强度的预测精度,可用于预测弯曲疲劳试件的抗折强度.
Abstract:
To improve the predicting precision of flexural strength, the characteristics of deformation curve and flexural proportional limit of concrete under bending stress are analyzed. The principle and technique of the prediction of single specimen’s bending strength based on flexural proportional limit are expounded. At the flexural proportional limit point, the stress-strain curve transforms from linearity to nonlinearity. Without destroying the specimens, load increase step by step to the level of 1 to 2 kN higher than the flexural proportional limit load. Therefore, by the transformation of incremental strain, the flexural proportional limit load can be determined. While the gradually loading does not bring damage to the concrete specimens. The flexural proportional limit is almost a constant for the concrete specimens with same mix proportion, and their average can be used as the approximate value for each specimen. The approximate bending strength of this specimen could be predicted with the value of the flexural proportional limit load divided by the average flexural proportional limit. Test results shows that the technique can improve the predicting precision of flexural strength remarkably. And it can be used to predict the flexural strength of specimens subjected to bending fatigue load.

参考文献/References:

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相似文献/References:

[1]韩以谦,黄熙.以抗折强度为指标的水泥混凝土配合比设计方法[J].东南大学学报(自然科学版),1993,23(1):105.[doi:10.3969/j.issn.1001-0505.1993.01.015]
 Han Yigian,Huang Xi,Huang Xi.Cement Concrete Mix Design Method Based on Flexure Strength[J].Journal of Southeast University (Natural Science Edition),1993,23(2):105.[doi:10.3969/j.issn.1001-0505.1993.01.015]
[2]戴居正.土坯砖性质的初步报告[J].东南大学学报(自然科学版),1957,3(1):31.[doi:10.3969/j.issn.1001-0505.1957.01.004]
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备注/Memo

备注/Memo:
作者简介: 洪锦祥(1976—),男,博士,hongjinxiang@cnjsjk.cn.
基金项目: “十一五”国家科技支撑计划资助项目(2006BAF02A25).
引文格式: 洪锦祥,缪昌文,刘加平,等.基于弯曲比例极限的单个试件抗折强度预测方法[J].东南大学学报:自然科学版,2010,40(2):357-361. [doi:10.3969/j.issn.1001-0505.2010.02.027]
更新日期/Last Update: 2010-03-20