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1·The principal tensile stress check is introduced in order to verify the adequacy of webs of segmental concrete girder Bridges for longitudinal shear and torsion.

主要拉应力检查旨在确认分段混凝土梁桥梁腹板用于纵向剪切与扭曲的充分性。

2·And that the Angle between extending crack and principal axial stress decreases gradually is caused by the variation of tensile and shear stress focuses in the course of brittle formation.

而扩展裂纹与主应力夹角的逐渐减小则是裂纹附近张应力和剪应力集中点的变化所致。