[1]任贇跃,刘问,冯鹏,等.缝高比对FRP拉挤型材软化关系的影响[J].世界地震工程,2016,(02):055-62.
 REN Yunyue,LIU Wen,FENG Peng,et al.Influence of crack-height ratio on tensile softening relationship of pultruded FRP[J].,2016,(02):055-62.
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缝高比对FRP拉挤型材软化关系的影响
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《世界地震工程》[ISSN:/CN:]

卷:
期数:
2016年02期
页码:
055-62
栏目:
出版日期:
2016-06-30

文章信息/Info

Title:
Influence of crack-height ratio on tensile softening relationship of pultruded FRP
作者:
任贇跃1 刘问1 冯鹏2 王艳晗1 罗璐1 郑毅2
1. 北京林业大学 土木工程系, 北京100083;
2. 清华大学 土木工程系, 北京100084
Author(s):
REN Yunyue1 LIU Wen1 FENG Peng2 WANG Yanhan1 LUO Lu1 ZHENG Yi2
1. Department of Civil Engineering, Beijing Forestry University, Beijing 100083, China;
2. Department of Civil Engineering, Tsinghua University, Beijing 100084, China
关键词:
结构工程拉伸软化模型试验研究FRP拉挤型材缝高比
Keywords:
structural engineeringtensile softening modelexperiment researchpultruded FRPcrack height ratio
分类号:
TU317
摘要:
为研究FRP拉挤型材拉伸软化特性,对顺纤维方向切口梁采用了三点弯曲试验,试件初始缝高比分别为0.2、0.3、0.4和0.5。试验测定了试件的荷载-挠度(P-δ)曲线、荷载-裂缝口张开位移(P-CMOD)曲线和荷载-裂缝尖端张开位移(P-CTOD)曲线,结果显示FRP拉挤型材断裂过程包括3个阶段:线性阶段、稳定阶段与失效阶段,表现为准脆性断裂破坏。应用P-δ曲线计算试件断裂能,再根据拉伸强度、断裂能以及变形关系建立双线性拉伸软化曲线。总断裂能由微裂纹断裂能和纤维桥连断裂能组成,研究表明:总断裂能大小不受初始缝高比影响,微裂断裂能约占总断裂能的60%;拉伸软化曲线受初始缝高比影响明显,建立了相应的函数公式。
Abstract:
In order to study the tensile softening property of pultruded FRP,a threepoint fracture test on single notched specimens was taken out along the fiber direction notch. The initial crack height ratioswere set as 0.2, 0.3, 0.4 and 0.5. The load-deflection (P-δ)curve, the load-crack mouth opening displacement (P-CMOD)curve, and the load-crack tip opening displacement(P-CTOD) curve were measured and recorded during the test.The result shows that, a quasi-brittle fracture phenomenon is obvious for pultruded FRP, which includes three stages:linear stage, stable stage and failure stage. According to the P-δ curve, the fracture energiesof tested specimen arecalculated to obtain bilinear tensile softeningcurve.The fracture energy is composed of two parts, cracking fracture energy and fiber bridging fracture energy.It shows that the crack-height ratio has little effect on the fracture energy,and the cracking fracture energy takes about 60% of the total fracture energy.The tensile softening model is obviously influenced by the initial crack height ratio, while the function formula between model parameters and crack height ratio is built.

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备注/Memo

备注/Memo:
收稿日期:2015-10-16;改回日期:2016-04-12。
基金项目:国家自然科学基金项目(51308046)
作者简介:任贇跃(1987-),男,研究生,主要从事高性能复合材料力学研究。E-mail:291607866@qq.com
通讯作者:刘问,女,副教授,博士,主要从事高性能工程材料断裂性能研究.E-mail:liuwen@bjfu.edu.cn
更新日期/Last Update: 1900-01-01