工具式应变传感器在桥梁检测中的应用研究

发布时间：2018-06-01 10:46

本文选题：工具式应变传感器 + 应变测量　；参考：《重庆交通大学》2015年硕士论文

【摘要】：针对WDAS-YB100型工具式应变传感器,采用有限元计算、室内试验、实桥试验等方法,并通过与常规的粘贴电阻应变片方法进行比对,开展工具式应变传感器在桥梁应变测试中的应用技术研究,得到了以下主要结果:①通过ANSYS有限元数值模拟分析和标定实验可知,WDAS-YB100型工具式应变传感器通过挖孔应变值放大了1.5倍,其灵敏度系数为1.685。②针对WDAS-YB100工具式应变传感器室内钢梁实验,通过ANSYS有限元分析和实验结果分析可知,应变片和工具式应变传感器的应变值与理论应变值相比,其最大相对误差分别为2.5%和3.4%,测量结果均具有较高的准确性、重复性和稳定性,且与数据采集仪等设备能较好的匹配;同时室内钢梁实验为小构件实验,由于弓形应变传感器距离被测结构表面存在一定的距离的影响工具式应变传感器应变值是应变片应变值的2.18倍,与理论计算值相对误差为1.38%,实验结果与理论计算值具有较好的重复性。③通过对工具式应变传感器的室内钢梁粘贴强度实验和现场混凝土梁桥粘贴强度实验分析,在考虑温度和胶水用量对粘贴时间影响的情况下,在钢结构表面粘贴7分钟后,在混凝土结构表面粘贴25分钟后进行试验较理想。同时为了便于腹板应变测量宜将柱形基座改为L形基座,L形基座底面、侧面作为粘贴面进行测量,增大工具式应变传感器的标距对拱桥等结构进行应变测量。④两座实桥试验采用WDAS-YB100型工具式应变传感器与应变片测量的对比试验,并通过对实测应变值的校验系数进行离散性分析可知,工具式应变传感器的校验系数方差小于应变片测量校验系数方差,说明工具式应变传感器校验系数的离散程度小于应变片测量校验系数,工具式应变传感器的应变测量结果稳定性更好、更准确、受人为因素影响小。同时工具式应变传感器安装与拆卸简单、技术人员要求低、耗时少。
[Abstract]:For the WDAS-YB100 type tool strain sensor, finite element calculation, indoor test, real bridge test and so on are adopted, and compared with the conventional resistance strain gauge method. The research on the application technology of the tool strain sensor in the bridge strain test is carried out. The following main results are obtained: 1. Through the ANSYS finite element numerical simulation and calibration experiments, we can see that the WDAS-YB100 tool strain sensor magnifies the strain value by 1.5 times by digging hole. The sensitivity coefficient is 1.685.2 the strain value of strain gauge and tool strain sensor is compared with the theoretical strain value by ANSYS finite element analysis and experimental result analysis. The maximum relative error is 2.5% and 3.4% respectively. The measurement results have high accuracy, repeatability and stability, and can match well with the equipment such as the data acquisition device, and the indoor steel beam experiment is a small component experiment. The strain value of the tool strain sensor is 2.18 times that of the strain gauge because there is a certain distance between the bow strain sensor and the measured structure surface. The relative error between the calculated value and the theoretical value is 1.38. The experimental results have a good reproducibility with the theoretical calculation value. 3. Through the experiment of the indoor steel beam bonding strength of the tool strain sensor and the field concrete beam bridge bonding strength experiment analysis, Considering the effect of temperature and glue content on the bonding time, it is ideal to test the steel structure surface after 7 minutes, and the concrete structure surface after 25 minutes. At the same time, in order to facilitate the web strain measurement, the column base should be changed into the L-shaped base, and the side should be used as the adhesive surface. The strain measurement of arch bridge and other structures was carried out by increasing the gauge distance of the tool strain sensor. 4. Two real bridges were tested by the contrast test of WDAS-YB100 tool strain sensor and strain gauge measurement. Through the discreteness analysis of the calibration coefficient of the measured strain value, it can be seen that the variance of the calibration coefficient of the tool strain sensor is smaller than that of the check coefficient measured by the strain gauge. It shows that the dispersion of calibration coefficient of tool strain sensor is smaller than that of strain gauge measurement, and the strain measurement result of tool strain sensor is more stable, more accurate and less affected by human factors. At the same time, the tool strain sensor is easy to install and disassemble, and the technicians require less time.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446;TP212

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