ULTIMATE LOAD-CARRYING CAPACITY ASSESSMENT FOR EXISTING RC BRIDGES
The present study carried out a destructive test of a 43-year-old reinforced concrete simply supported channel-beam bridge to gain insight into the ultimate load-carrying capacity of existing RC bridges. The destructive test was performed by loading the decommissioned bridge to failure in order to understand the mechanical performance of RC bridges during the whole loading process and structural response under the ultimate limit state. Based on a detailed field inspection of the material strength, structural damage and degradation before testing, a finite element model of the actual bridge was employed to correlate the predicted responses with those measured during the destructive testing of the bridge. It was observed from the measured results that the mechanical performance of the real structure revealed local nonlinearities due to its beam-to-beam connections, boundary conditions and initial damages. The simulated behaviors do not exhibit this phenomenon. However, there is a good agreement between the measured and simulated results when the materials’ degradation was taken into consideration in the numerical analysis. The mode of failure of the tested bridge was the typical flexural failure characterized by yielding of tensioned reinforcement and concrete crumbling. The failure also occurred at the location of bridge bearings besides that the top concrete at the midspan of the test bridge was crushed. This indicated that the failure mode of the tested bridge was affected by various influencing factors.
Ezisting RC bridge destructive test damages ultimate load-carrying capacity
Jian-Ren Zhang Hui Peng Jian-Xin Peng
School of Civil Engineering and Architecture,Changsha University of Science & Technology,Changsha,Hunan 410004,P.R. China
国际会议
长沙
英文
158-166
2009-10-26（万方平台首次上网日期，不代表论文的发表时间）