Experimental Study on a Full-scale 30m Span UHPC Box Girder
The first highway ultra-high performance concrete (UHPC) girder bridge in China is an overpass bridge, which has a span arrangement of 4×30m with a total length of 127 m.Taking this bridge as the prototype, structure design of the 30m UHPC continuous girder is optimized.Following the optimized structure, a 30 m UHPC box girder was fabricated.It was simply-supported and tested under two concentrated force at the mid-span.In the test, counterweight blocks of truck cranes were employed for loading and acquired successfully.Using ABAQUS software, a FEM is established and verified by the test results.From the test and FEM analysis, the whole loading process of the girder can be divided into five stages, i.e., elastic phase, cracking phase, reinforcement yielding phase, prestressed strand yielding phase and decline phase.Test results show that the optimized girder meets the design requirements of serviceability limit state and ultimate limit state.The computed and tested ultimate loads are 1837 kN and 1815 kN, respectively, much larger than the design ultimate load 697 kN.The plane-section assumption of the girder is verified by the test.Finally, the tested results of cracks are described, they distributed mainly on the mid-span region of 1000 cm.The crack of the girder developed continuously in number, width and length with the increase of the load.
Ultra-High Performance Concrete(UHPC) box girder optimization design full scale test deflection calculation
Bao-chun Chen Xi-lun Ma Jia-liang Zhou Douglas Paul Gauvreau
国际会议
福州
英文
1091-1101
2018-11-04（万方平台首次上网日期，不代表论文的发表时间）