Phân tích biến dạng và chuyển vị trong kết cấu cầu treo dây võng bất đối xứng

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Tác giả: VĂN QUÂN NGÔ, VĂN TÌNH NGÔ

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Xây dựng, 2024

Mô tả vật lý: tr.104

Bộ sưu tập: Metadata

ID: 372100

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Cầu treo dây võng nói chung và cầu treo dây võng bất đối xứng nói riêng là dạng kết cấu siêu tĩnh bậc cao có độ mãnh lớn và thường nhạy cảm với các loại tải trọng như tải trọng gió, động đất,…. Vì là dạng kết cấu vượt nhịp lớn nên khi tính toán thiết kết thường được chọn các dạng tiết diện hình học sao cho giảm được tải trọng bản thân, diện tích chắn gió và tiết diện hợp lý về khả năng chống xoắn. Do đó, độ mãnh của kết cấu sẽ lớn và trong giai đoạn khai thác thì chuyển vị thường lớn. Đồng thời dao động thì phức tạp. Vì vậy khi tính toán thiết kế cầu treo dây võng phải chú ý nhiều đến các trạng thái giới hạn sử dụng và trạng thái giới hạn đặc biệt. Để tính toán theo trạng thái giới hạn sử dụng ta phải sử dụng các yếu tố về chuyển vị và biến dạng. Có nhiều yếu tố ảnh hưởng đến biến dạng, chuyển vị của kết cấu cầu treo dây võng như: chiều dài kết cấu nhịp, chiều cao trụ tháp, tiết diện của dầm chủ, trụ tháp,….Trong các bài báo mà tác giả đã công bố trong số tháng 9/2022 và tháng 2/2023 trên Tạp chí Xây dựng các tác giả đã trình bày về ảnh hưởng của tính bất đối xứng của chiều cao trụ tháp đối với sự phân bố nội lực trong dầm chủ, trụ tháp,cáp chủ và cáp treo. Đồng thời các tác giả cũng đề xuất một số tỷ lệ hợp lý về chiều cao trụ tháp và nhịp chính theo các yếu tố về nội lực [8], [12]. Trong bài báo này nhóm tác giả sẽ trình bày ảnh hưởng của tính bất đối xứng chiều cao trụ tháp đến biến dạng và chuyển vị của một số bộ phận chính trong kết cấu cầu treo dây võng bất đối xứng. Thông qua việc sử dụng phần mềm phân tích kết cấu cầu Midas/civil. Từ khóa: Cầu treo dây võng
cầu treo dây võng bất đối xứng
biến dang và chuyển vị trong cầu treo dây võng
biến dạng của dầm chủ trong cầu treo dây võng
biến dạng của cáp chủ
biến dạng của cáp treo.Suspension bridges in general and asymmetric suspension bridges in particular are high-level superstatic structures with great strength and are often sensitive to loads such as wind loads, earthquakes, etc. Because it is a large span structure, when calculating the design, geometric crosssections are often chosen to reduce self load, wind protection area and reasonable cross-section for torsional resistance. Therefore, the strength of the structure will be large and during the exploitation phase the displacement is often large. At the same time, oscillation is complicated. Therefore, when calculating the design of a suspension bridge, much attention must be paid to the use limit states and special limit states. To calculate according to the limit state of use, we must use displacement and deformation factors. There are many factors that affect the deformation and displacement of the suspension bridge structure such as: span structure length, tower pier height, cross-section of main beams, tower piers, etc. In the articles written by the author Published in the September 2022 and February 2023 at Journal of Construction, the authors presented the influence of the asymmetry of tower pier height on the distribution of internal forces in main beams and piers. tower, main cable and car cable. And the authors also proposed some reasonable ratios for the height of the tower and main span according to internal force factors [8], [12]. In this article, the authors will present the influence of tower pier height asymmetry on the deformation and displacement of some main parts in the asymmetric suspension bridge structure. Through the use of Midas/civil bridge structural analysis software. Keywords: Suspension bridge
asymmetrical suspension bridge
deformation and displacement in suspension bridge
deformation of main beam in suspension bridge
deformation of main cable
deformation of suspension cable.

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