STRUCTURAL SAFETY OF PRESTRESSED CONCRETE GIRDER BRIDGES DESIGNED TO THE NEW CHINESE BRIDGE CODE
Highway bridges are important asset to our society. The safety of a highway bridge is always concerned by the owner as well as the public. In this paper, the structural safety of prestressed concrete girder bridges designed to the new Chinese Bridge Code is studied. The required cross sectional areas of prestressing strands for simply supported post-tensioned T-girder bridges are analysed and compared in accordance with the former Chinese Code, the new Chinese Code, and the AASHTO LRFD Code. The bridges cover spans ranging from 25 m to 40 m. Analysis shows the serviceability limit state governs the design of prestressed concrete bridge girders in connection with the former Chinese Code and the AASHTO LRFD Code. For the new Chinese Code, bridges of shorter span lengths are governed by the ultimate limit state whereas those with longer span lengths are governed by the serviceability limit state. The actual cross sectional area of prestressing strands required by the former Chinese Code is slightly more than that needed by the AASHTO LRFD Code. Generally speaking, the actual cross sectional area of strands required by the new Chinese Code exceeds that needed by the AASHTO LRFD Code by 8% to 12%, whereas the actual cross sectional area of prestressing strands required by the new Chinese Code exceeds that needed by the former Chinese Code by 7% to 8%. Apart from the design code, other factors that determine the safety of prestressed concrete bridges are highlighted.
Prestressed concrete Bridge girder Limit state.
Jin Sheng DU Xing Yun XIANG Pui Lam NG Francis Tat Kwong AU
School of Civil Engineering, Beijing Jiao Tong University, Beijing, 100044, China Department of Civil Engineering, The University of Hong Kong, Hong Kong, China
国际会议
北京
英文
430-435
2008-10-27（万方平台首次上网日期，不代表论文的发表时间）