principal tensile stress

The results found that: ( 1) the transverse corner field resulting from the uneven geometrical width of YBT model leads to the non-uniform spreads and distributions of the active lengthwise tensile stress, the stretchy strain and the passive transverse pressure stress in the principal axis;

由此得出：①YBT模型几何宽度不均匀所形成的横向角部区域，导致了主动型的纵向主轴拉应力和主轴伸长应变以及被动型的横向主轴压应力的不均匀传播与分布；

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If the validity of vertical prestress can be guaranteed effectively, the principal tensile stress can also be inhibited;( 4) Parametric analysis is taken on web thickness, beam height and the soffit curve of the main girder.

若能保证竖向预应力的有效性，能有效抑制主拉应力的产生。（4）对主梁腹板厚度、梁高及变化规律进行参数化分析。

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The results indicate that along with the increase of concrete cover thickness, the maximum corrosion expansion force of concrete specimen increases; stirrups encryption can be reduced the maximum principal tensile stress of specimen surface, thus inhibited or delayed the appearance of corrosive cracks.

结果表明：混凝土所能承受的最大锈胀力随保护层厚度增加而增大；箍筋加密能降低混凝土表面的最大主拉应力，从而有效抑制或延缓混凝土表面锈胀裂缝的产生。

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The influence of the supporting beam depth, the thermal coefficient of the material and the heat exchange coefficient on the maximum principal tensile stress in the boiler-supporting beam under the load of the temperature field is analyzed as well.

同时分析了支撑梁在该温度场作用下支撑梁宽度、材料的导热系数、梁表面热交换系数对梁内最大主拉应力的影响。

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Based on the experimental result, the influence of the maximum tensile stress and distortion energy density on brittle fracture and crack opening direction is analyzed by means of studying the field of distortion energy density and principal stress in the vicinity of a crack tip.

分析了裂纹尖端附近的形状改变能密度场和主应力场，结合试验数据研究了最大拉应力与形状改变比能对脆性断裂及断裂方向的影响。

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The higher the initial temperature of fresh concrete is, the higher the maximum principal thermal tensile stress and the crack risk at the surface center node are.

表面中心点的最大主拉应力和开裂风险随浇注初温的升高而增大。

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