Please wait a minute...
浙江大学学报(工学版)
J4  2013, Vol. 47 Issue (4): 588-594    DOI: 10.3785/j.issn.1008-973X.2013.04.004
土木工程     

高温后混凝土断裂全过程的裂缝扩展阻力曲线
俞可权1, 陆洲导1, 唐安静2
1. 同济大学 结构工程与防灾研究所, 上海 200092；2. 同济大学 建筑与城市规划学院,上海 200092
Residual crack extension resistance during complete fracture
process of post-fire concrete
YU Ke-quan1, LU Zhou-dao1, TANG An-jing2
1. Research Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China| 2. College of Architecture and Urban Planning, Tongji University, Shanghai 200092, China
 全文: PDF 
摘要：

采用楔入劈拉法试验,设置20～600 ℃共10组温度,试件尺寸统一采用230 mm×200 mm×200 mm,初始缝高比为0.4.根据试验得到的荷载-开口位移曲线（P-CMOD）求得应力强度因子曲线（K曲线）.基于虚拟裂缝黏聚应力,对高温后混凝土断裂全过程的裂缝扩展阻力曲线进行求解.将混凝土断裂全过程划分为4个部分,裂缝黏聚应力呈Petersson双线性软化曲线分布.计算表明,在某一特定温度下,裂缝扩展阻力曲线随裂缝扩展长度的增加而增长；阻力曲线随温度的上升呈下降趋势.对应力强度因子曲线与裂缝扩展阻力曲线进行裂缝扩展的稳定性分析.结果表明,当裂缝扩展阻力曲线位于应力强度因子曲线上方时,裂缝稳定发展；反之,裂缝将失稳发展.该判据可以等同于双K断裂准则,起裂韧度、失稳韧度是裂缝扩展阻力曲线上的2个关键点.
关键词：  ;  黏聚应力;  裂缝扩展阻力曲线;  应力强度因子曲线;  双K断裂准则    
Abstract:

Wedge-splitting tests with totally ten temperatures varying from 20 ℃ to 600 ℃ were conducted, and the specimen size of 230 mm×200 mm×200 mm with initial-notch depth ratios 0.4 were considered. The load-crack mouth opening displacement curves (P-CMOD) of post-fire specimens were obtained from which the residual stress intensity factor curves (K-curves) were calculated. The residual crack extension resistance curves (KR-curves) of post-fire concrete, associated with cohesive force distribution on fictitious crack zone of complete fracture process, were obtained. The cohesive force distribution corresponding to four different crack propagation stages, was determined according to Petersson bilinear softening traction-separation law. In each temperature, with the distribution of cohesive force along the fracture process zone, the residual fracture toughness increases with the increasing crack length Δa. The KR-curves decrease with increasing temperatures for the thermal damage induced. The stability analysis on crack propagation demonstrates that when the KR-curve is higher than K-curve, the crack steadily propagates|otherwise, the crack unsteadily propagates. This criterion can be reduced to dual-K criterion in which the initial fracture toughness and the unstable fracture toughness are two key points on the KR-curve.
Key words: cohesive force    crack extension resistance curve    stress intensity factor curve    dual-K criterion
出版日期: 2013-05-07
:  TU 528  
基金资助:

土木工程防灾国家重点实验室基金资助项目（SLDRCE09-D-02）.
通讯作者: 陆洲导,男,教授,博导.     E-mail: lzd@tongji.edu.cn
作者简介: 俞可权（1986—）,男,博士生,从事混凝土抗火的研究.E-mail:：zjzjykq@163.com
服务　　
把本文推荐给朋友
加入引用管理器
E-mail Alert
RSS
作者相关文章　　

引用本文:

俞可权, 陆洲导, 唐安静.
高温后混凝土断裂全过程的裂缝扩展阻力曲线[J]. J4, 2013, 47(4): 588-594.

YU Ke-quan, LU Zhou-dao, TANG An-jing. Residual crack extension resistance during complete fracture
process of post-fire concrete. J4, 2013, 47(4): 588-594.

链接本文:

http://www.zjujournals.com/xueshu/eng/CN/10.3785/j.issn.1008-973X.2013.04.004    或    http://www.zjujournals.com/xueshu/eng/CN/Y2013/V47/I4/588

［1］ XU S L, REINHART H W. Determination of double-K criterion

for crack propagation in quasi-brittle fracture, Part II:

analytically evaluating and practically measuring methods for

three-point bending notched beams ［J］. International Journal

of Fracture, 1999, 98(2): 151-177.

［2］ XU S L, REINHART H W. A simplified method for determining

double-K fracture parameters for three-point bending tests ［J

］. International Journal of Fracture, 2000, 104(2): 181-209.

［3］ 俞可权.高温后混凝土断裂性能研究 ［D］.上海：同济大

学,2012.

YU Ke-quan. Residual fracture properties of concrete subjected

to elevated temperatures ［D］. Shanghai: Tongji University,

2012.

［4］ PETERSSON P E. Crack growth and development of fracture

zones in plain concrete and similar materials ［R］. Sweden:

Division of Building Materials, Lund Institute of Technology,

Report TVBM-1006, 1981.

［5］ 中国航空研究院.应力强度因子手册［M］.北京：科学出版

社,1981.

［6］ JENQ Y S, SHAH S P. Two parameter fracture model for

concrete ［J］. Journal of Engineering Mechanics, 1985, 111

(10): 1227-1241.

［7］ XU S L, REINHART H W. Crack extension resistance and

fracture properties of quasi-brittle materials like concrete

based on the complete process of fracture \
[J\]. International

Journal of Fracture, 1998, 92(2): 71-99.

［8］ XU S L, REINHART H W. Determination of double-K criterion

for crack propagation in quasi-brittle fracture, Part III:

compact tension specimens and wedge splitting specimens ［J］.

International Journal of Fracture, 1999, 98(2): 179-193.
[1] 张俊红, 张玉声, 王健, 徐喆轩, 胡欢, 赵永欢. 考虑热机耦合的排气歧管多目标优化设计[J]. 浙江大学学报(工学版), 2017, 51(6): 1153-1162.
[2] 任迪, 万健, 殷昱煜, 周丽, 高敏. 基于贝叶斯分类的Web服务质量预测方法研究[J]. 浙江大学学报(工学版), 2017, 51(6): 1242-1251.
[3] 宋瑞祥, 张庆国, 于海敬, 徐丽, 施悯悯. 遥感数据的城市不透水面估算及增温效应[J]. 浙江大学学报(工学版), 2017, 51(5): 1051-1056.
[4] 李静, 王哲. 似平面应力条件下混凝土的变形特性[J]. 浙江大学学报(工学版), 2017, 51(4): 745-751.
[5] 蒋鑫龙, 陈益强, 刘军发, 忽丽莎, 沈建飞. 面向自闭症患者社交距离认知的可穿戴系统[J]. 浙江大学学报(工学版), 2017, 51(4): 637-647.
[6] 李明, 刘扬, 唐雪松. 疲劳裂纹的跨尺度分析[J]. 浙江大学学报(工学版), 2017, 51(3): 524-531.
[7] 张捷, 肖新标, 王瑞乾, 金学松. 高速列车铝型材声振特性测试及等效建模[J]. 浙江大学学报(工学版), 2017, 51(3): 545-553.
[8] 李晓东, 祝跃飞, 刘胜利, 肖睿卿. 基于权限的Android应用程序安全审计方法[J]. 浙江大学学报(工学版), 2017, 51(3): 590-597.
[9] 苏星, 王慧泉, 金仲和. 实时高可靠综合电子系统的逻辑架构设计[J]. 浙江大学学报(工学版), 2017, 51(3): 628-636.
[10] 潜龙昊, 胡士强, 杨永胜. 多节双八面体变几何桁架臂逆运动学解析算法[J]. 浙江大学学报(工学版), 2017, 51(1): 75-81.
[11] 张伟, 胡友德, 郑立荣. 基于频率可调驻波振荡器的芯片时钟系统设计[J]. 浙江大学学报(工学版), 2017, 51(1): 168-176.
[12] 谢罗峰, 徐慧宁, 黄沁元, 赵越, 殷国富. 应用双树复小波包和NCA-LSSVM检测磁瓦内部缺陷[J]. 浙江大学学报(工学版), 2017, 51(1): 184-191.
[13] 刘海宾, 王勇, 马鹏磊, 谢玉东. 基于平行式振荡翼系统参数耦合分析[J]. 浙江大学学报(工学版), 2017, 51(1): 153-159.
[14] 厉文榜,方梦祥,岑建孟,肖平,时正海,山石泉,王勤辉,骆仲泱. K-Fe复合催化剂对煤半焦气化速率与产物的影响[J]. 浙江大学学报(工学版), 2016, 50(9): 1746-1751.
[15] 江衍铭,郝偌楠,蔡文柄. 台湾洪水预报进展及模型实务应用[J]. 浙江大学学报(工学版), 2016, 50(9): 1784-1790.