地震荷载下考虑管内有压流体的PCCP耦合动力分析

PCCP（预应力钢筒混凝土管）因其优良性能被广泛应用于我国水利水电及市政给排水等生命线工程的建设中。现有研究多为静力分析，少有学者对PCCP管内流体的动力相互作用开展研究。本文利用ABAQUS对PCCP结构及其管内流体在地震荷载下的双向流固耦合作用进行分析，开展了考虑流固耦合与未耦合条件下管道各个结构层的动力响应。进一步计算了考虑内水压力、地震荷载大小和管内水流速度等条件变化对管道受力变形特性的影响。结果表明:流固耦合模型能更加真实地还原和模拟在役PCCP的工作状态；内水压力显著影响管道的受力状态，PCCP结构随着输水压力的增大逐步由受压状态向受拉过渡，且受拉区域和拉应力峰值逐渐增大；管内水流速对应力场影响很微弱。

Coupled dynamic analysis of PCCP considering the inner pressure fluid under seismic load

PCCP (Prestressed Concrete Cylinder Pipe) is widely used in the construction of lifeline projects such as water conservancy and hydropower, municipal water supply and drainage in China because of its excellent performance. However, most of the existing researches are static analysis, and few scholars have carried out research on the dynamic analysis of the interaction of inner fluids and structure in PCCP. In this paper, the authors use the ABAQUS to analyze the bidirectional fluid-structure interaction (FSI) of PCCP and the dynamic response of each structural layer considering FSI and Non-FSI. The authors further analyze the influence of changes in conditions such as internal water pressure, seismic load and water flow velocity in the pipe on the force and deformation characteristics of the pipe. The results show that: the FSI model can more realistically restore and simulate the working state of PCCP in service; The internal water pressure significantly affects the stress state of the pipeline, and the structure gradually transitions from the compressed state to the tension with the increase of the water pressure; In addition, the tension area and the peak tensile stress gradually increase; However, the water velocity in the pipe has little effect on the stress field of the structure.