内嵌式光纤布拉格光栅传感器智能钢绞线有效预应力监测技术的工程应用  

Engineering Applications of Embedded Optical Fiber Bragg Grating Sensor Intelligent Steel Strands for Monitoring Effective Prestress

作　　者：贾俊峰[1] 侯智献 杜瑞民 王蕾 白石 李小龙 JIA Junfeng;HOU Zhixian;DU Ruimin;WANG Lei;BAI Shi;LI Xiaolong(State Key Laboratory of Bridge Engineering Safety and Resilience,Beijing University of Technology,Beijing 100124,China;Yunnan Mangliang Highway Investment and Development Co.,Ltd.,Dehong 678400,Yunnan,China;School of Civil Engineering and Architecture,University of Jinan,Jinan 250022,Shandong,China;Zhixing FRP Reinforcement Nantong Co.,Ltd.,Nantong 226000,Jiangsu,China)

机构地区：[1]北京工业大学桥梁工程安全与韧性全国重点实验室,北京100124 [2]云南芒梁高速公路投资发展有限公司,云南德宏678400 [3]济南大学土木建筑学院,山东济南250022 [4]智性纤维复合加固南通有限公司,江苏南通226000

出　　处：《济南大学学报(自然科学版)》2025年第2期228-237,244,共11页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(52178449)。

摘　　要：为了解决实际工程中预应力混凝土结构体内有效预应力无法监测的问题,根据光纤布拉格光栅传感器在结构健康监测中具有精度高、实时性强等优点,探讨内嵌式光纤布拉格光栅传感器智能钢绞线有效预应力监测技术的工程应用;通过对该智能钢绞线开展拉伸试验,检验智能钢绞线的拉伸强度、线性度等参数;以云南省某高速公路预应力混凝土T梁桥示范工程为例,同时监测预应力混凝土T梁桥正、负弯矩区智能钢绞线张拉过程中智能钢绞线内的有效预应力,得到正弯矩区混凝土弹性压缩、智能钢绞线与孔道间摩擦、锚具变形和智能钢绞线内缩造成的预应力损失,并与千斤顶张拉应力及预应力损失的规范理论计算值对比。结果表明:该智能钢绞线力学性能和线性度良好,并且应变灵敏度系数即每微应变波长的变化值为1.22~1.26 pm,与应变灵敏度系数的理论值1.21 pm相差较小;相对于千斤顶张拉应力及有效预应力的规范理论计算值,预应力混凝土T梁桥正、负弯矩区智能钢绞线张拉过程中各测点处光纤布拉格光栅传感器监测应力的最大误差不超过3.86%,并且与预应力损失的规范理论计算值相比,该智能钢绞线在各测点处的预应力损失监测值误差较小;该智能钢绞线表现出良好的可靠性和稳定性,能满足实际工程需求。To solve the problem that effective prestress in prestressed concrete structures cannot be monitored in actual projects,engineering applications of embedded optical fiber Bragg grating sensor intelligent steel strands for monitoring effective prestress were explored according to advantages of optical fiber Bragg grating sensors in structural health monitoring such as high precision,strong real-time,and so on.Parameters of the intelligent steel strands such as tensile strength and linearity were verified by conducting a tensile test on the intelligent steel strands.Taking the demonstration project of a prestressed concrete T-girder bridge on a highway in Yunnan Province as an example,effective prestress monitoring in the intelligent steel strands was simultaneously carried out on tensioning processes of the intelligent steel strands in positive and negative moment zones of the prestressed concrete T-girder bridge to get prestress losses due to concrete elastic compression in positive moment zone,friction between the intelligent steel strands and apertures,anchorage deformation and shrinkage of the intelligent steel strands,and compared with normative theoretical calculated values of jack tension stress and prestress losses.The results show that mechanical properties and linearity of the intelligent steel strands are good,and the strain sensitivity coefficient,i.e.,the wavelength variation value per microstrain,is 1.22-1.26 pm,which is smaller than the theoretical value of strain sensitivity coefficient of 1.21 pm.Compared with the jack tension stress and the normative theoretical calculated values of effective prestress,the maximum error of grating sensor monitoring stress at each measuring point during tensioning process of the intelligent steel strands in positive and negative moment zones of the prestressed concrete T-girder bridge does not exceed 3.86%.Compared with the normative theoretical calculation values of prestress losses,errors of prestress loss monitoring values of the intelligent steel strands at ea

关 键 词：结构健康监测 有效预应力 智能钢绞线 光纤布拉格光栅传感器 工程应用 

分 类 号：TN253[电子电信—物理电子学] TU378[建筑科学—结构工程]