基于DSCM的混凝土结构变形局部化试验  

Experimental study on deformation localization of concrete structures with DSCM

作　　者：沈新普[1] 冯金龙[1] 代树红[2] 杨璐[1] 

机构地区：[1]沈阳工业大学建筑工程学院,沈阳110023 [2]辽宁工程技术大学力学系,辽宁阜新123000

出　　处：《沈阳工业大学学报》2008年第2期212-218,共7页Journal of Shenyang University of Technology

基　　金：国家自然科学基金资助项目(10472072);辽宁省教育厅青年基金计划资助项目(05L310)

摘　　要：为了研究混凝土梁试件在四点剪切受力情况下变形局部化的位移场、应变场及其演化过程,采用了单边预制缺口混凝土梁和双边预制缺口混凝土梁两种结构模型.使用CCD摄像机采集了试件加载过程中的散斑场.使用数字散斑相关方法对采集到的散斑场进行了处理分析.结果显示出了混凝土试件在不同时刻的位移场分布和应变场分布,观察到了试件在变形局部化过程中位移场和应变场的演化过程.结果表明:数字散斑相关方法是进行混凝土损伤断裂特性研究的一种有效试验方法,为研究混凝土变形非均匀局部化演化过程及混凝土细观本构参数的取值提供了一种高效的新的试验手段.In order to measure the displacement and strain fields as well as their evolution in the process of deformation localization of concrete specimens under four-point-shear loading,single-notched beam and double-notched concrete beam were used.CCD camera was used to collect data of speckle fields.Then a new optics method,i.e.,digital speckle correlation method,was used to treat speckle fields.Distribution of displacement and strain fields was obtained,and their evolution process was investigated.Results indicate that the digital speckle correlation method is an effective experimental method for studying characteristic of damage and rupture of concrete structures.It provides a new way for research of deformation localization and measurement of micro constructive parameter of concrete structures.

关 键 词：混凝土 变形局部化 数字散斑相关方法 位移场 应变场 

分 类 号：TU375[建筑科学—结构工程]