基于有效裂纹扩展量的不同形式诱导缝等效强度模型对比研究  

Study on equivalent strength model for different types of crack directors based on effective crack propagation

作　　者：张玉梅[1] 王剑 贾艳东[1] 刘钧玉[3] 

机构地区：[1]辽宁工业大学土木建筑学院,辽宁锦州121001 [2]大连电力勘察设计院有限公司,辽宁大连116011 [3]沈阳工业大学建筑工程学院,辽宁沈阳110024

出　　处：《混凝土》2011年第1期20-23,共4页Concrete

基　　金：国家自然科学基金(50709013)

摘　　要：用失稳断裂韧度对混凝土裂纹亚临界扩展量进行了分析,得到了反映实际规律且具有实际物理意义的有效裂纹扩展量公式,将该公式运用到单向间隔和双向间隔两种不同形式诱导缝等效强度公式中,得到了变化后的单向间隔和双向间隔诱导缝的等效强度公式。通过两种诱导缝的等效强度随诱导缝中心间距的变化曲线比较了两种诱导缝的优劣,得到双向间隔诱导缝比单向间隔诱导缝更好的结论。Unstable fracture toughness was used to analyze effective crack propagation of concrete, and crack propagation formula with real physical meaning and realistic rule were gotten.The formulae were adopted to equivalent strength model for universal and bilateral interval crack directors, the modified equivalent strength formulae for the two crack directors were got.The merits between the two crack directors was compared by the variation curve for equivalent strength vs.center distance of all the crack directors.It is concluded that properties of bilateral interval crack directors are better than those of universal interval crack director.

关 键 词：单向间隔诱导缝 双向间隔诱导缝 等效强度模型 失稳韧度 有效裂纹扩展量 

分 类 号：TU528.01[建筑科学—建筑技术科学]