Punching-Shear Behavior of Overlay Strengthened RC Slab under Traveling Wheel-Type Fatigue Loading  

Oleh:

Shimanaka, Y. ; Ueda, T. ; Furuuchi, H. ; Zhang, D. ; Tamura, T. ; Lim, S-C.

Jenis: Article from Proceeding
Dalam koleksi: Proceeding The 1st International Conference on Sustainable Civil Engineering Structures and Construction Materials (SCESCM) di Yogyakarta, September 11 – 13, 2012, page 117-123.
Topik: Fatigue; Wheel loading; Overlaying; Punching shear failure; FRP
Fulltext: 15.pdf (711.5KB)

Isi artikel

Overlaying on the bottom surface is one of the reinforcing methods for RC slabs in bridges. In this study, FRP (Fiber Reinforced Plastic) grid was used as the reinforcing material and HPFRCC (High Performance Fiber Reinforced Cement Composite) was used as the overlaying material. The main objectives of the research are to determine the effects of overlay strengthening, especially the amount of reinforcing material in the overlaying on the fatigue resistance of Reinforce Concrete (RC) slab under travel wheel loading. Two specimens were prepared, in which FRP grid of 50mm grid spacing and 100mm grid spacing were used respectively. Before overlaying, the specimens were pre-loaded 30,000 cycles with a magnitude of 126kN to induce the pre-damage. The overlay strengthened specimens were given step wheel loading from 126kN till failure. The results of wheel loading test showed that after the strengthening, the fatigue life was increased in comparison with the case without strengthening; however, there were almost no differences in the fatigue life between application of 100mm grid spacing and 50mm grid spacing FRP grids. The Palmgren-Miner (PM) hypothesis is applied to calculate the fatigue life and the calculated result agrees well with the experimental result.

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