SD型模数式伸缩缝耦合动力学研究

Research on the Coupling Kinetics of SD Modular Expansion Joint

以SD型模数式伸缩缝为研究对象,运用有限元分析软件ABAQUS对SD型模式伸缩缝进行耦合(竖向和水平)动力学研究。其中,建立了完整的耦合动力学理论模型,模拟在行驶的汽车通过伸缩缝时,伸缩缝中梁竖向和水平向振动响应特性。研究结果表明:不考虑车辆制动力以及不同车速情况下,伸缩缝中梁竖向振动位移与水平振动位移之间几乎没有什么影响。因此,对伸缩缝竖向和水平向振动响应研究时可以单独进行研究,从而可以简化研究,提高效率。制动力对伸缩缝水平振动位移影响比较大。如果考虑制动力的影响,水平振动位移的增大会对伸缩缝结构产生不利的影响。不考虑制动力情况下,采用德国规范分析得到的水平振动位移最大值为0.235 mm,采用我国规范并忽略制动力下分析得到最大水平振动位移几乎接近于零;而最大竖向振动位移比按照我国规范并忽略制动力影响的条件下分析得到的小21%。在不同速度80 km/h,120 km/h条件下,采用德国规范分析得到的伸缩缝最大竖向振动位移与我国规范分析得到的相比分别小16%和19%。

Taking SD modular expansion joint as the research object, this paper studied the vertical and horizontal coupling dynamics of SD modular expansion joint by using the finite element analysis software ABAQUS. A complete model of coupling dynamics was established to simulate the vertical and horizontal vibration response characteristics of the center beam of a moving car through the expansion joint. The results show that the vertical vibration displacement and horizontal vibration displacement of the center beam does not influence each other beyond vehicle braking force and speed. Therefore, the study on the vertical and horizontal vibration response of the expansion joints can be studied independently to simplify the research and improve efficiency. The braking force has larger influence on the vibration displacement of the expansion joint. Taking the influence of braking force into consideration, the increase of horizontal vibration displacement would have a negative effect on the expansion joint structure. Without considering the braking force, the maximum value of horizontal vibration displacement is 0.235 mm under Germany’s specification and the maximum value of horizontal vibration displacement nearly approaches zero under China’s specification; however, the maximum vertical vibration displacement is 21 percent smaller than that of the analysis under the conditions of China’s specification. Under the condition of 80 km/h and 120 km/h, the maximum vertical vibration displacement of the expansion joints obtained by German specification was 16% and 19% respectively smaller than that of China’s specification.