混凝土多孔砖砌体墙的开裂性能实用解析研究

李妍,孟广伟,尹新生

1.吉林大学机械科学与工程学院;2.吉林建筑工程学院寒地绿色建筑技术工程研究中心



摘要:

为解决混凝土多孔砖砌体墙的裂缝问题,提出了一种基于竖向灰缝模型的求解其等效断裂韧度(线弹性断裂力学中裂缝发生失稳扩展的临界值)的实用解析方法.首先,运用修正的剪滞理论,分区引入变异层,建立了分层剪滞模型;然后,根据能量法则,推导出了求解其等效断裂韧度的解析计算模式.通过与3组11个试件的试验结果对比发现,该解析解的均方差和变异系数更小,且其等效断裂韧度是与试件尺寸无关的等效断裂参数,这为研究混凝土多孔砖砌体墙的开裂与破坏的预测预报提供了新的方法,在工程上具有较强的适用性.

关键词:  混凝土多孔砖砌体墙  线弹性断裂力学  等效断裂韧度  剪滞理论

DOI：10.11918/j.issn.0367-6234.2010.10.027

分类号:O346.1

基金项目:国家教育部博士点基金(20060183063);吉林省科技发展计划项目(20080711)



A practical analytical research on cracking behavior of concrete perforated brick masonry

LI Yan^1,2, MENG Guang-wei³, YIN Xin-sheng²

1.College of Mechanical Science and Engineering,Jilin University,Changchun 130022,China;2.The Research Centre of Green Architecture Technology in Cold Area,Jilin Architecture and Civil Engineering Institute,Chanchun 130118,China,);3.ollege of Mechanical Science and Engineering,Jilin University,Changchun 130022,China

Abstract:

Aimed at the cracking of concrete perforated brick wall,a practical analytical method was proposed,in which the equivalent fracture toughness was solved based on the vertical crack model.At first,based on the modified shear lag theory and by introducing the variable layer in different zones,the layered shear lag model was built.Then,an analytical form to solve the equivalent fracture toughness of concrete perforated brick wall was derived based on the energy law.The results of the related experiments show that the analytical solutions are more robust than the numerical solutions.In the case of varying sub-layers,the equivalent fracture toughness is a size-independent fracture parameter.So the suggested method is feasible and applicable to forecast concrete perforated brick masonry’s cracking and destroying.

Key words:  concrete perforated brick masonry  the linear elastic fracture mechanics  equivalent fracture toughness  shear lag theory