And use the fourth strength theory, the axial tension in the coiled tubing under the influence of internal and external pressure from a comprehensive stress of checking.
并利用第四强度理论，对连续油管在轴向拉力与内外压力的作用下的综合应力进行了校核。
It shows the axial tension initial cracking strength of concrete increases with the increasing of steel fiber volume ratio and enhancing of concrete strength grade separately.
结果表明：混凝土轴拉初裂强度分别随钢纤维体积率的增大和混凝土强度等级的提高而增大。
It shows the axial tension initial cracking strength of concrete increases with the increasing of steel fiber volume ratio and enhancing of concrete strength grade separately.
结果表明：混凝土轴拉初裂强度分别随钢纤维体积率的增大和混凝土强度等级的提高而增大。
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