[1]姚琏,叶连生,钱辉惋.乱向短纤维增强混凝土的裂后纤维有效系数[J].东南大学学报(自然科学版),1983,13(1):87-95.[doi:10.3969/j.issn.1001-0505.1983.01.009]
 Yao Lian,Ye Lian-sheng,and Qian Hui-wan.Post-cracking Efficiency Factors for Fibres of Random Short Fibres Reinforced Concrete[J].Journal of Southeast University (Natural Science Edition),1983,13(1):87-95.[doi:10.3969/j.issn.1001-0505.1983.01.009]
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乱向短纤维增强混凝土的裂后纤维有效系数()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
13
期数:
1983年第1期
页码:
87-95
栏目:
本刊信息
出版日期:
1983-03-20

文章信息/Info

Title:
Post-cracking Efficiency Factors for Fibres of Random Short Fibres Reinforced Concrete
作者:
姚琏叶连生钱辉惋
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Author(s):
Yao Lian Ye Lian-sheng and Qian Hui-wan
关键词:
有效系数 纤维增强混凝土 复合材料 根纤维 纤维长度 极限抗拉强度 埋深长度 概率理论 纤维取向 纤维体积率
分类号:
+
DOI:
10.3969/j.issn.1001-0505.1983.01.009
摘要:
本文对乱向短纤维增强混凝土在直接拉力作用下裂后的纤维有效系数,进行了探讨。根据埋深长度相同的纤维具有相等拔出力而与纤维取向无关的假设,并按照统计规则,作者得到纤维由于取向不同而引起的裂后增强效率为cosθ。然后应用概率理论求出合理的乱向短纤维方向有效系数C_0。根据上述假设,可以得出取向不同的纤维将具有相同的临界长度的结论。这样,也就可应用概率理论、推导纤维长度有效系数C_l。本文还提出了界面粘结系数C_b并说明了它的物理意义。最后,作者提出了下列分式:计算裂后纤维有效系数C_f的为 C_f=C_θC_bC_l;纤维临界体积率V_f(crit)的为 V_{f(crit)}=(σ_{mu})/C_{fσfu}-_(η0∈_{mu}E_f+ηθσ_{mu};复合材料的极限直接抗拉强度或裂后抗拉应力为σ_{cu}=C_{fσfu}V_f。实验值与估计值颇相一致。
Abstract:
In this paper, the post-cracking efficiency factors for the fibres of the random short fibres reinforced concrete under direct tension are discussed. On the assumption that the pull-out forces on the fibres with the same embedded length in the matrix are the same, regardless of the orientation of the reinforcement, and according to the statistical rule the authors obtain that the postcracking strengthening efficincy of the fibre due to its orientation is cos θ. Then by means of the probability theory the rational orientation efficincy factor C_θ for the random shor fibres may be derived. From the assumption described above the following conclusion may be drawn that the fibres with the different orientation will possess the same critical length. Then the probability theory may be also used in making out the post-cracking length efficiency factor C_l for the fibres. Furthermore, this paper suggests interracial bond factor C_b and explains its physical meaning. Finally, the authors propose the formulas for calculating the post-cracking fibre efficiency factor C_f=C_θC_bC_l, for estimating the critical volume of fibres U_f(crit)=σ_{mu}/(C_{∫σfu-η_{θ}∈_{mu}}E_f+η_θσ_{mu} and for predicting the ultimate direct tensile strength or the post-cracking tensile stress of the composite σ_{cu}=C_{fσfu}V_f The predicted values are well agreed with the experimental results.

相似文献/References:

[1].南京工学院学报1983年总目录[J].东南大学学报(自然科学版),1984,14(1):136.[doi:10.3969/j.issn.1001-0505.1984.01.015]
 [J].Journal of Southeast University (Natural Science Edition),1984,14(1):136.[doi:10.3969/j.issn.1001-0505.1984.01.015]

更新日期/Last Update: 2013-05-01