Reinforcement-Steel Fiber Concrete Shield Segment Normal Section Bearing Capacity and Reinforcement Determination Method
A technology of steel fiber concrete and fiber concrete, which is applied in the direction of testing material strength by applying stable bending force and testing material strength by applying stable tension/compression, which can solve the problems of low accuracy, neglect of tensile properties, and deviations And other issues
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Embodiment 1
[0077] Determination of the bearing capacity of the normal section of the steel-steel fiber reinforced concrete shield segment.
[0078] The steel bar-steel fiber reinforced concrete shield segment normal section load-bearing capacity determination method provided by the present embodiment comprises the following steps:
[0079] S1 Through the three-point bending test of the steel fiber reinforced concrete shield segment opening beam, the elastic bending and tensile residual strength value f under different opening displacement CMOD is obtained R .
[0080] The three-point bending test of the open beam of steel fiber reinforced concrete is specifically to pour different amounts of steel fiber reinforced concrete into a 150mm×150mm×550mm specimen (the weight of steel fiber doping in each cubic steel fiber reinforced concrete is 25Kg / m 3 、30Kg / m 3 、35Kg / m 3 、40Kg / m 3 、45Kg / m 3 、50Kg / m 3 and 55Kg / m 3 ), the steel fiber length is 50mm. like figure 1 As shown, do slotting ...
example 1
[0086] Example 1, for steel fiber doping amount is 30Kg / m 3 The test piece (referred to as test piece SF30), calculated according to the formula (1), f R1 =5.87MPa, f R3 =4.88MPa, therefore, f R3 / f R1 =0.831, the specimen is post-crack softening constitutive model.
example 2
[0087] Example 2, for steel fiber doping amount is 40Kg / m 3 The test piece (referred to as test piece SF40), its f R1 =6.62MPa, f R3 =7.04MPa, therefore, f R3 / f R1 =1.063, the specimen is a rigid-plastic constitutive model.
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