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Figure 7 shows the results of the undrained triaxial compression tests performed in this study for various values of coefficient of Skempton (B) between 32 and 90% with an initial confining pressure of 100 kPa.
Strength and acoustic velocities increase with increasing confining pressure.
Samples were subjected to an effective confining pressure of approximately 45 kPa, and cyclic loading having a maximum deviator stress of 300 kPa was applied on the ballast specimens at a frequency of 20 Hz.
Since sufficient amount of confining pressure was not generated by FRP fabrics in the case of column HS-50-40-T1(3), axial deformation control of column was very small.
The regression equations for parameters other than the ultimate compressive stress and ultimate axial strain can also be modeled with just two coefficients of regression, one for the inverse of slenderness ratio and the other for the ratio between FRP confining pressure and the unconfined compressive strength of concrete.
In early stage of cyclic test, with the times of cyclic loading increasing, the pore water pressure of the compression direction increases up to almost 100% of confining pressure, the effective stress reduces to zero, the maximum ratio of pore water pressure reaches up to 0.
7] cubic centimeters per second per gram, a performance under pressure (PUP) capacity value of at least about 23 grams under a confining pressure of 0.
Parry (1960) indicated that drained triaxial shearing test results going through different stress path under the same confining pressure would achieve the same critical state for normally consolidated soil and overconsolidated soil.
Pore pressure buildup leading to liquefaction may be due to static or cyclic stress applications and the possibility of its occurrence depends on the void ratio or relative density of sand and the confining pressure (Seed 1979).
The confinement pressure provided by the FRP increases continuously with the lateral strain of concrete because of the linear elastic stress-strain behaviour of FRP, in contrast to steel-confined concrete in which the confining pressure remains constant when the steel is in plastic flow.
Some treatments of confining pressure on every sample were 25 kPa, 50 kPa and 100 kPa, respectively.