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首页> 外文会议>Canadian Society for Civil Engineering annual conference >CASE STUDY TO ASSESS THE SENSITIVITY OF PRESTRESSED CONCRETE POLES TO TORNADOES
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CASE STUDY TO ASSESS THE SENSITIVITY OF PRESTRESSED CONCRETE POLES TO TORNADOES

机译：评估预应力混凝土桩对筒体敏感性的案例研究

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摘要

Transmission line structures play a vital role in transmitting electricity from the source of production to the distribution system. The main components of a transmission line are the conductors, the insulator strings, the ground wires and the supporting towers. Among the different types of supporting towers, prestressed concrete transmission poles have the advantages of low installation and maintenance costs, appropriate delivery time, and corrosion resistivity. To the best of the authors' knowledge, this paper represents the first investigation conducted to assess the response of cantilever prestressed concrete poles to tornadoes. The localized nature of the tornadoes and the extended length of the conductors introduce some challenges in predicting the critical response of power transmission towers to tornadoes. The current study is conducted numerically using an in-house numerical model that includes the following: (1) a three-dimensional tornado wind field developed using computational fluid dynamics simulations; (2) a non-linear simulation of the structural behaviour of a prestressed concrete transmission poles taking into account the non-linear behaviour of the concrete and of the prestressed strands, and (3) a simulation of the non-linear behaviour of the conductors including the effects of the pretension force, sagging, the insulator's stiffness and the non-uniform distribution of wind loads. Details of this numerical model are briefly discussed in this paper. A case study is considered to assess the importance of including the effect of tornadoes in the design of prestressed concrete poles.
机译：传输线结构在将电力从生产源传输到配电系统中起着至关重要的作用。传输线的主要组件是导体，绝缘子线，地线和支撑塔。在不同类型的支撑塔中，预应力混凝土传输杆的优点是安装和维护成本低，交货时间适当以及耐腐蚀性。据作者所知，本文代表进行的第一项研究，以评估悬臂预应力混凝土杆对龙卷风的响应。龙卷风的局部性和导体的延长长度在预测输电塔对龙卷风的关键响应方面提出了一些挑战。当前的研究是使用内部数值模型进行的，该模型包括以下内容：（1）使用计算流体动力学模拟开发的三维龙卷风风场; （2）考虑到混凝土和预应力绞线的非线性行为，对预应力混凝土传输杆的结构行为进行非线性模拟，以及（3）导体的非线性行为进行模拟包括预紧力，下垂，绝缘子的刚度和风荷载的不均匀分布的影响。本文将简要讨论此数值模型的详细信息。考虑了一个案例研究，以评估将龙卷风的影响纳入预应力混凝土杆的设计中的重要性。

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