Ảnh hưởng của tính bất đối xứng chiều cao trụ tháp đến sự phân bố nội lực trong dầm chủ cầu treo dây võng

0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: Văn Quân Ngô, Văn Tình Ngô

Ngôn ngữ: Vie

Ký hiệu phân loại: 625 Engineering of railroads and roads

Thông tin xuất bản: Tạp chí Xây dựng 2022

Mô tả vật lý: 78-83

Bộ sưu tập: Metadata

ID: 403220

Thêm vào giỏ Liên kết toàn văn

Cầu treo dây võng là dạng kết cấu siêu tĩnh bậc cao, có tính thẩm mỹ v ề kiến trúc và khả n ăng vượt nhịp lớn. Trong cầu treo dây võng thì dầm chủ, trụ tháp, cáp chủ, cáp treo là những kết cấu chịu lực chính. Trong cầu treo dây võng, thường có hai trụ tháp với chiều cao bằng nhau. Tuy nhiên, trong thực tế chiều cao của hai trụ tháp không nhất thiết phải bằng nhau gọi là bất đối xứng và thực tế là đã có những công trình cầu treo dây võng với chiều cao trụ tháp không đối xứng nhau. Khi chiều cao trụ tháp không đối xứng và thay đổi thì sự phân bố nội lực, biến dạng, chuyển vị của các kết cấu trong cầu treo dây võng cũng thay đổi. Trong bài báo này tác giả tập trung khảo sát ảnh hưởng của tính bất đối xứng chiều cao trụ tháp đến sự phân bố nội lực trong dầm chủ của cầu treo dây võng thông qua phân tích kết quả tính toán các mô hình cầu treo dây võng dựa trên kết quả thống kê kích thước, tỷ lệ nhịp, chiều cao trụ tháp của các cầu treo dây võng thực tế trên thế giới. Thông qua việc sử dụng phần mềm phân tích kết cấu cầu rất phổ biến ở Việt Nam hiện nay là Midas/civil và các lý thuyết phần tử hữu hạn. Còn ảnh hưởng của tính bất đối xứng chiều cao trụ tháp đến nội lực trong trụ tháp, cáp chủ, cáp treo và biến dạng, chuyển vị sẽ được xem xét trong các bài báo sau., Tóm tắt tiếng anh, Suspension bridge is high-level static structure, with architectural aesthetics and the ability to overcome long spans. In a suspension bridge, the main girder, tower, main cable, and suspender cable are the main load-bearing structures. In a suspension bridge, there are usually two towers with the same height. However, in reality, the height of the two towers is not necessarily equal, called asymmetry and the fact that there have been suspension bridges with asymmetrical tower heights. When the height of the towers is not symmetrical and changes, the distribution of internal forces, deformation, and displacement of the structures in the suspension bridge also changes. In this paper, the author studies the influence of towers height asymmetry on the distribution of internal forces in the main girder of a suspension bridge by analyzing the results of calculation of models of suspension bridges based on Statistical results of size, span ratio, tower height of the actual suspension bridge in the world. Using software to analyze bridge structure very popular in Vietnam is Midas/civil and the theory of finite element method. The influence of tower height asymmetry on internal forces in tower, main cables, suspender cable and deformation and displacement will be considered in the following articles.

1. Đọc trực tuyến

1. Đọc trực tuyến

Tạo bộ sưu tập với mã QR