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Một số phân tích và khảo sát thiết kế kháng xoắn cầu dầm hộp cong nhịp liên tục bê tông cốt thép dự ứng lực

Nội dung bài viết cũng sẽ tập trung vào dạng kết cấu dầm bê tông cốt thép dự ứng lực mặt cắt hộp, nhịp liên tục cong bằng với bán kính cong nhỏ. | Transport and Communications Science Journal Vol 72 Issue 3 04 2021 356-368 Transport and Communications Science Journal ANALYSES AND INVESTIGATIONS OF TORSIONAL RESISTANCE ON PRESTRESSED CONCRETE CONTINUOUS BOX GIRDER BRIDGES WITH HORIZONTALLY CURVED ALIGNMENT Dang Viet Duc University of Thuyloi No 175 Tay Son Street Dong Da Hanoi Vietnam ARTICLE INFO TYPE Research Article Received 16 01 2021 Revised 25 03 2021 Accepted 29 03 2021 Published online 15 04 2021 https doi.org 10.47869 tcsj.72.3.10 Corresponding author Email dangvietduc@gmail.com Tel 0936020377 Abstract. Curved pre-stressed concrete bridge structures have been applied commonly to grade separated intersections overpass bridges viaducts and bridges in mountainous areas which avoid landsliding and compromise the landscape in Natural Area Preserves. Torsion in curved bridge girders is a such considerable issue for bridge structural design process. Bridge girders designed with the type of box section achieve good tortional resistance and both positive and hogging flexural strength which is suitable for the bridge structure of continuous spans. The background of tortional resistance based on the mean of closed box geometry and stirrups is analysed. Factors which influenced on girder s tortional moment distribution like bearing set up and tendon arrangenment are also important contents of the paper. Research contents of this paper investigate curved pre-stressed concrete PC box girder bridges with span length of 40m and horizontally curved radius of 70m the minimum curved radius according to the current design code requirements of delta third level highway. The flexural tortional and shear resistances of the bridge girder will be checked accordiong to internal force distributions obtained from FEM models. Conclusions of torsional resistance of girder which preliminarily designed from corresponding straight bridge influences of bearing arrangement and tendon design on torsional moment distribution are also .