动载作用下波纹钢涵洞力学响应特征

Mechanical response characteristics of corrugated steel culvert under dynamic load

为研究柔性波纹钢管、拱形涵洞的动力学特性,选用YZD10D型振动压路机为振动源、941B型多功能振动传感器采集信号,将传感器连接至DEWE-43A型动态数据采集仪,并通过Dewesoft X软件转换采集到的电压信号实时获取数据,对如下4个部位进行振动试验,振动源位于涵洞中心正交于涵洞轴线方向(平行于行车方向)、振动源位于距涵洞中心3 m处(正交于轴线方向)、振动源位于距涵洞中心5 m处(正交于轴线方向)、振动源位于涵洞中心平行于涵洞轴线方向(正交于行车方向),对其横向、轴向、竖向速度及加速度的时程特征和快速傅里叶变换(FFT)频谱特征展开研究,探究涵洞随振源水平距离变化的动力学响应规律,并对比分析管、拱形波纹钢涵洞(下文简称为管涵、拱涵)截面的动力响应特征。研究结果表明:涵洞横向、轴向、竖向的速度及加速度的衰减速率均随距振源水平距离的增大而逐渐减小,振动作用下波纹钢涵洞一阶振动频率与动力源频率相近,其横向、轴向、竖向速度及加速度最大主频域分布均在100 Hz内,动载作用下拱涵的抵抗变形能力相比管涵较差,相同加载方案下拱涵横向、轴向加速度及速度幅值均大于管涵,故在涵洞选型时可优先选取管涵。

In order to study the dynamic characteristics of flexible corrugated steel pipes and arched culverts,a YZD10D vibratory roller was selected as the vibration source and a 941B multifunctional vibration sensor was used to collect the signals.The sensor was connected to a DEWE-43A dynamic data acquisition instrument,and the voltage signal was converted by Dewesoft X software to obtain data in real time,and vibration tests were carried out on the following four parts,the vibration source located in the centre of the culvert orthogonal to the direction of the culvert axis(parallel to the direction of traffic),the vibration source located at 3 m from the centre of the culvert(orthogonal to the direction of the axis),the vibration source located at 5 m from the centre of the culvert(orthogonal to the direction of the axis),the vibration source located in the centre of the culvert parallel to the direction of the culvert axis(orthogonal to the direction of traffic),the time characteristics of the transverse,axial and vertical velocity and acceleration,and the FFT(fast Fourier)was carried out to investigate the dynamic response of the culvert with the change of the horizontal distance of the vibration source,and to compare and analyse the dynamic response characteristics of the corrugated steel culvert pipe and arch section.The results show that the decay rate of transverse,axial and vertical velocity and acceleration of the culvert gradually decreases with the increase of the horizontal distance of the vibration source.The first-order vibration frequency of corrugated steel culvert under vibration is similar to that of the power source,and the maximum main frequency domain distribution of its transverse,axial and vertical velocity and acceleration are all within 100 Hz.The resistance to deformation of the arch culvert under dynamic loading is poorer than that of the pipe culvert.The transverse and axial acceleration and velocity amplitude are greater than those of pipe culverts,so pipe culverts can be preferred in the culvert selection.1 tab,8 figs,24 refs.