3D-DIC在土木结构力学性能试验研究中的应用  

Application of 3D-DIC in experimental study on mechanical properties of civil structures

作　　者：刘聪[1] 陈振宁[1] 何小元[1] 

机构地区：[1]东南大学土木工程学院,南京210096

出　　处：《东南大学学报（自然科学版）》2014年第2期339-344,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(11172258;11272089)

摘　　要：为了更好地研究土木结构力学性能,采用改进的三维数字图像相关系统开展了纤维增强复合材料包裹混凝土柱抗压试验、纤维增强复合板-混凝土相对滑移试验、钢板拉压疲劳试验、预应力混凝土抗震试验和钢桁架结构连续倒塌动力试验.对圆柱体试件全表面同时进行测量,分析得到了360°全场应变数据.当平均应变达到2×10-2时,根据三维数字图像相关方法与电测法所得的应变结果的相对误差小于3%,说明前者具有较高的应变和位移测量精度.继而提出了一种基于边缘点消除刚体位移的方法,得到了滑移位移结果.利用高帧频相机进行连续采图,实现了在试验过程中的动态测量.由此证实了改进的三维数字图像相关系统在土木结构力学性能研究中的有效性.An improved three-dimensional digital image correlation （3 D-DIC ） system is used to study the mechanical properties of civil structures conveniently.The corresponding experiments in-clude the fiber reinforced polymer （FRP ） wrapped concrete columns compression test,the FRP sheets-concrete bond-slip test,the steel plate tension and compression fatigue test,the prestressed concrete seismic test,the steel truss structure continuous collapse dynamic test.The whole surface of the cylindrical specimen is measured simultaneously,and the 360°full field strain data are obtained. When the mean strain is up to 2 ×10 ^-2,the relative error of the strain obtained by the 3D-DIC meth-od and that by the electrical measuring method is less than 3%,exhibiting the high precision of the strain and displacement of the 3 D-DIC method.Then,a method for eliminating rigid displacement based on edge points is proposed,and the corresponding bond-slip displacement is obtained.High frame rate cameras are utilized to capture images continuously and the dynamic test is carried out. Therefore,the availability of the improved 3 D-DIC system in experimental studies on the mechanical properties of civil structures is proved.

关 键 词：三维 数字图像相关 力学性能 土木工程试验 

分 类 号：TU375.1[建筑科学—结构工程] TU317.1