Evaluation of Bearing Capacity for Cracked Prestressed Concrete Box Girder
The problem of cracking is serious in civil engineering increasingly, especially in long-span pre-stressed concrete continuous box girder bridges, which has a direct impact on usability, durability and security. In order to quantitatively evaluate the bearing capacity of the bridge with cracks under different parameters, such as cracks width, cracks height and the number of cracks and provide the basis for the safety assessment and reinforcement, the paper puts forward the cracking reduction coefficient that evaluates the bearing capacity of the damaged bridge based on the tensile stress control. A threespan continuous rigid frame bridge is analyzed and the result shows that the bearing capacity reduces by 8.5％ and 12.3％, when transverse cracks of bottom slab appear and cracks width varies from 0.10mm to 0.15mm.When the height of cracks is 5mm, 10mm, 15mm and 20mm, respectively, the bearing capacity reduces by 13.1％, 13.8％, 15.4％ and 16.9％. The result also illustrates that the bearing capacity of the bridge reduces by 17.7％, 19.2％, 20.8％ and 22.3％, respectively, when the number of cracks increases from 2 to 5.
bearing capacity cracking reduction coefficient cracks evaluation box girder
Zhaoning Zhang Yu Zhao Shuanhai He
School of Highway, Changan University,Xian, China Key Laboratory for Bridge and Tunnel of Shanxi Province,Changan University, Xian, China
国际会议
三峡
英文
153-156
2012-05-18（万方平台首次上网日期，不代表论文的发表时间）