3D扫描仪在超低周疲劳试验塑性变形采集中的应用

Application of 3D scanner in plastic deformation collection of low-cycle fatigue test

针对目前土木工程领域中,对于结构体系或构件的抗震性能试验中塑性变形的检测数据存在不精确、限制度较大且不能满足试验数据需求的情况,结合螺栓球网格结构超低周疲劳性能与评定试验,通过利用3D扫描仪建立球杆试件循环荷载作用下弹塑性变形空间形态,并根据扫描结果来获取试件的塑性变形数据,依据这些数据对循环荷载下试件的弹塑性性能进行描述,同时采用常规测量方法对3D扫描仪采集的数据进行比对,验证了其精准度。试验的数据处理结果表明,3D扫描仪在数据测量与收集方面具有很高的精确度和全面性,且提出的四面各个扫描法和椭圆化变形直观图在试验中有良好的效果。

In the field of civil engineering,the test data of plastic deformation in the seismic performance test of structural system or component is imprecise,limited and unable to meet the test data requirements.Based on the project funded by National Natural Science Foundation of China,the ultra-low cycle fatigue performance and evaluation test of bolt-mesh structure is established by using 3D scanner.The spatial shape of the elastic-plastic deformation of the specimen under the cyclic load is obtained according to the scanning results,and the elastic-plastic performance of the specimen under the cyclic load is described according to these data.At the same time,the data collected by the 3D scanner is compared with the data collected by the conventional measurement method to verify its accuracy.The experimental data processing results show that the 3D scanner has high accuracy and comprehensiveness in data measurement and collection,and the proposed four sides scanning method and ellipse deformation illustrative diagram have good effect in the experiment.