高强箍筋混凝土梁裂缝分布的分形特征  

FRACTAL CHARACTERISTICS OF CRACK DISTRIBUTION OF CONCRETE BEAMS WITH HIGH STRENGTH STIRRUP

作　　者：李艳艳[1] 戎贤[1] 王铁成[2] 

机构地区：[1]河北工业大学土木工程学院,天津300130 [2]天津大学建筑工程学院,天津300072

出　　处：《工程力学》2009年第A01期72-76,共5页Engineering Mechanics

摘　　要：通过8根集中荷载下高强箍筋混凝土梁的受剪破坏试验,基于混凝土梁表面裂缝分布特征,采用分形理论对钢筋混凝土梁开裂和破坏过程进行了定量化分析与描述。研究结果表明:混凝土梁在破坏状态以及各荷载水平下表面裂缝分布可以用构件表面裂缝的分维数来表征。对于混凝土梁表面裂缝分布的盒维数而言,损伤演化过程是一个增维过程。同时建立了混凝土梁表面裂缝分维数与损伤变量的量化关系,分维数的大小不仅反映裂缝发育的密集与复杂程度,而且还能定量反映混凝土构件的损伤程度。Experimental research on 8 concrete beams with high strength stirrups under concentrated load has been performed. Based on the surface-crack distribution of shear members, fractal geometry theory is employed to investigate the cracking and failure process of concrete beams. The result shows that the fractal dimensions on the surface of concrete beams can be used to describe the state of cracking damage under the influence of various stresses. For the fractal dimension of the crack distribution, the damage evolution is a process of dimension increase. Moreover, a relationship has been established between the fractal dimension and the damage variable. Therefore, the fractal dimension can be used to describe the characteristics of crack and the damage degree of concrete beams.

关 键 词：土木建筑工程 混凝土梁 分形理论 高强箍筋 裂缝 损伤变量 

分 类 号：TU375.1[建筑科学—结构工程] O346.5[理学—固体力学]