To investigate of ultimate state of filament winding FRP pipe against bending force caused by earthquake, we perform four-point bending test of the FRP pipes with 1.4MPa inner water pressure. Twelve pipes with four different proportions are applied to the test. The test results show that the damaged form and strength depends on the proportion of the pipe. It is considered reasonable to set the allowable bending capacities according to size of the pipes.

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