埋入式振弦传感器的埋设影响研究  

Research on the Influence of Embedded Vibrating Wire Sensor

作　　者：吕文龙 许勇[2] 沈仁良 LYU Wenlong;XU Yong;SHEN Renliang(Guangdong Provincial Academy of Building Research Group Co.,Ltd.,Guangzhou 510000,China;School of Civil Engineering,Guangzhou University,Guangzhou 510000,China)

机构地区：[1]广东省建筑科学研究院集团股份有限公司,广东广州510000 [2]广州大学土木工程学院,广东广州510000

出　　处：《自动化与信息工程》2023年第1期15-21,共7页Automation & Information Engineering

基　　金：住房与城乡建设部科技计划资助项目(2017-k10-006)。

摘　　要：针对埋入安装的振弦式传感器设计传感器变异性试验,研究直接绑扎法、预制块嵌入法、8字型扣件法、接长杆安装法、焊接法5种混凝土应变计和钢筋替换法、姐妹杆等效法2种钢筋应力计埋设方法的埋入影响,并对比埋入安装的振弦式混凝土应变计和振弦式钢筋应力计的测量情况。结果表明:1)在5种振弦式混凝土应变计的埋设方法中,预制块嵌入法埋设效果最好,单位荷载下的应变变异系数为4.97%;接长杆安装法、焊接法埋设效果较好,单位荷载下的应变变异系数约为10%;直接绑扎法、8字形扣件法埋设效果相对较差,单位荷载下的应变变异系数在20%以内,可作为补充或相互验证手段;2)2种振弦式钢筋应力计埋设方法钢筋替换法和姐妹杆等效法,单位荷载下的应力变异系数分别为-5.48%和-5.55%,埋设效果比较理想;3)振弦式混凝土应变计的预制块嵌入法和振弦式钢筋应力计的钢筋替换法、姐妹杆等效法埋设效果最佳,但预制块嵌入法操作繁琐,在工程上难以广泛应用,故振弦式钢筋应力计更适用于桩身内力的测试。In view of the sensor variability test of the embedded vibrating wire sensor design,the paper studies the embedding effect of five concrete strain gauges,namely,the direct binding method,the prefabricated block embedding method,the 8-shaped fastener method,the extension bar installation method,the welding method,and the reinforcement replacement method,and the sister bar and other effective methods,and compares the measurement of the embedded vibrating wire concrete strain gauge and the vibrating wire reinforcement stress gauge.The results show that:1)Among the five embedding methods of vibrating wire concrete strain gauge,the embedding method of prefabricated block has the best effect,and the strain variation coefficient under unit load is 4.97%;The installation method of extension rod and welding method have good embedding effect,and the strain variation coefficient under unit load is about 10%;The burying effect of the direct binding method and the 8-shaped fastener method is relatively poor,and the strain variation coefficient under unit load is within 20%,which can be used as a supplementary or mutual verification method;2)Two kinds of vibrating wire reinforcement stress meter embedding methods,reinforcement replacement method and sister bar equivalent method,the stress variation coefficient under unit load is-5.48%and-5.55%respectively,and the embedding effect is relatively ideal;3)The precast block embedding method of vibrating wire type concrete strain gauge,the reinforcement replacement method of vibrating wire type reinforcement stress gauge and the sister bar equivalent method have the best embedding effect,but the precast block embedding method is cumbersome and difficult to be widely used in engineering,so the vibrating wire type reinforcement stress gauge is more suitable for the test of pile internal force.

关 键 词：振弦式传感器 变异系数 埋设方法 混凝土应变计 钢筋应力计 变异性试验 

分 类 号：TU67[建筑科学—建筑技术科学]