基于光栅传感的剪力墙结构抗侧刚度检测仿真

Detection Simulation of Lateral Stiffness of Shear Wall Structure Based on Grating Sensing

针对传统方法存在的检测结果准确率不高的问题,为准确获取剪力墙结构的抗侧刚度值,提出一种基于光栅传感的抗侧刚度检测方法。将反射光中心波长与光栅有效折射率、调制周期之间的关系作为信号采集依据,探讨光束传输过程中不同方向模之间的耦合现象。结合剪力墙的惯性特点,把光栅振动传感器固定在待测剪力墙上,利用位移、速度以及加速度等物理指标,描述抗侧刚度的惯性振动,根据解得的不失真幅频特性与相频特性,完成抗侧刚度检测。仿真检测结果表明,剪力墙抗侧刚度值会受到部分因素影响而发生变化,所提方法能精准检测出目标剪力墙结构的抗侧刚度,具有一定的有效性与实际应用价值。

A lateral stiffness detection method based on grating sensing is presented in this paper in order to obtain the lateral stiffness of the shear wall structure accurately. The relationship between the central wavelength of reflected light and the effective refractive index and modulation period of the grating was utilized as the basis of signal acquisition. The coupling between modes in different directions during beam propagation was studied in detail. According to the inertia characteristics of the shear wall, the grating vibration sensor was fixed on the shear wall to be measured. Displacement, velocity and acceleration were used to characterize the inertial vibration of lateral stiffness.Based on the undistorted amplitude-frequency characteristics and phase-frequency characteristics, the anti-lateral stiffness was detected. The simulation results show that some factors affect the lateral stiffness of the shear wall. The lateral stiffness of shear wall structure measured by this method is accurate, indicating that this method is effective and practical.