论文摘要
作为土木工程中重要的支护形式之一,锚杆加固通常应用于公路、铁路、水利、矿井等工程中的高陡边坡和巷道承受岩土体压力的加固结构。预应力锚杆是在结构承受外载荷前,预先对外载荷下的受拉压区施加一定的压应力,以改善结构的性能。随着时间推移锚杆安装完成后岩土等被锚固结构自身的风化作用和锚杆自身的受力,蠕动变形和应力松弛都会改变锚杆的受力状态,特别是被锚固结构压缩变形,会使锚杆张拉完成锁定后的预应力损失,为了避免重大事故,因此需要对锚杆的受力情况进行长期安全监测。目前多使用传统电式测量方法测量轴向拉力,通过测量来评价锚固性能,这类方法易受电磁干扰,信号传输距离较短。本文利用光纤Bragg光栅作为传感元件,对锚杆的锚头和杆体拉力的测量进行了理论分析和实验研究,选用轮辐式测力结构和应变管传感结构,对型号为HRB335屈服强度为335 MPa,长度490mm,内外径25/16 mm,截面积A=290mm2的中空热轧带肋螺纹钢锚杆分别利用万能试验机和压力试验机进行锚头及杆体拉压试验。主要研究内容如下:(1)在锚头处锚杆整体拉力测量通过轮辐式测力结构,辐条在压力作用下产生剪切变形,从而引起辐条表面的光纤Bragg光栅中心波长移位,建立光纤Bragg光栅中心波长位移与压力的数学传感模型。(2)在杆体上锚杆轴向力测量通过引脚沿轴向将应变管结构的光纤Bragg光栅应变传感器焊接在杆体上的。在拉力作用下锚杆体受力带动应变传感器引脚间距发生变化导致应变传感器的光纤Bragg光栅中心波长产生移位,建立光纤Bragg光栅中心波长位移与拉力的数学传感模型。(3)拉压试验表明:锚杆张拉测力灵敏度为0.7pm/kN,轮辐压力光栅1的测力灵敏度为74pm/kN,光栅2的测力灵敏度为151pm/kN。
论文目录
相关论文文献
- [1].Testing the Universality of Free Fall by Comparing the Atoms in Different Hyperfine States with Bragg Diffraction[J]. Chinese Physics Letters 2020(04)
- [2].Theoretical Simulation of the Temporal Behavior of Bragg Diffraction Derived from Lattice Deformation[J]. Chinese Physics Letters 2020(07)
- [3].固定于水面的多个半圆形结构物的水波Bragg反射[J]. 上海交通大学学报 2019(09)
- [4].基于光纤Bragg光栅传感器的车辆载重动态检测系统的初步开发[J]. 通讯世界 2016(24)
- [5].Spectral Beam Combining of Fiber Lasers by Using Reflecting Volume Bragg Gratings[J]. Chinese Physics Letters 2016(12)
- [6].Proton Bragg Peak Irradiation Experiment of Components for Aerospace[J]. Annual Report of China Institute of Atomic Energy 2019(00)
- [7].光纤Bragg光栅振动传感器的标定与不确定度分析[J]. 机械科学与技术 2020(11)
- [8].BRIGHT:the three-dimensional X-ray crystal Bragg diffraction code[J]. Nuclear Science and Techniques 2019(03)
- [9].Periodic structural defects in Bragg gratings and their application in multiwavelength devices[J]. Photonics Research 2016(02)
- [10].Wave Power Focusing due to the Bragg Resonance[J]. China Ocean Engineering 2017(04)
- [11].基于光纤Bragg光栅传感器的现役高桩码头结构健康监测系统设计与实施[J]. 水道港口 2016(02)
- [12].Numerical Simulation of Bragg Reflection Based on Linear Waves Propagation over A Series of Rectangular Seabed[J]. China Ocean Engineering 2008(01)
- [13].Design of a Solid-Core Large-Mode-Area Bragg Fiber[J]. Chinese Physics Letters 2015(05)
- [14].An introduction to Bragg diffraction-based cold atom interferometry gravimeter[J]. Instrumentation 2015(04)
- [15].Interrogating a Fiber Bragg Grating Vibration Sensor by Narrow Line Width Light[J]. Journal of Electronic Science and Technology of China 2008(04)
- [16].Demodulation System for Fiber Bragg Grating Sensors Using Digital Filtering Technique[J]. Transactions of Tianjin University 2008(01)
- [17].Modification of Interfacial Performance of Fiber Bragg Grating Embedded in the Composite Materials[J]. Journal of Wuhan University of Technology(Materials Science) 2017(04)
- [18].Bragg reflection in a quantum periodic structure[J]. Chinese Optics Letters 2015(12)
- [19].基于光纤Bragg光栅的采动支承压力分布试验研究[J]. 西安科技大学学报 2016(02)
- [20].低能质子的Bragg曲线测量[J]. 中国原子能科学研究院年报 2017(00)
- [21].Two-dimensional non-spatial filtering based on holographic Bragg gratings[J]. Chinese Physics B 2010(07)
- [22].Fiber Bragg Gratings in Small-Core Ge-Doped Photonic Crystal Fibers[J]. Journal of Electronic Science and Technology of China 2008(04)
- [23].Thermal characteristics of Fabry–Perot cavity based on regenerated fiber Bragg gratings[J]. Chinese Optics Letters 2018(12)
- [24].Damage and recovery of fiber Bragg grating under radiation environment[J]. Chinese Physics B 2018(09)
- [25].光纤Bragg光栅倾角传感器的标定与不确定度分析[J]. 光学技术 2017(03)
- [26].Irradiation effect on strain sensitivity coefficient of strain sensing fiber Bragg gratings[J]. Chinese Physics B 2014(01)
- [27].基于3G的光纤Bragg光栅地层沉降监测系统[J]. 传感器与微系统 2013(09)
- [28].Theoretical analysis of polarization properties for tilted fiber Bragg gratings[J]. Science China(Information Sciences) 2010(02)
- [29].一种基于光纤Bragg光栅传感器的挡土墙变形监测技术[J]. 传感器与微系统 2010(11)
- [30].Mechanism of Bragg Diffraction-Assisted Light Extraction in GaN-based Light-Emitting Diodes Based on a Self-Consistent Model[J]. Communications in Theoretical Physics 2009(09)