混凝土分段曲线损伤模型

在对比分析国内外现有的混凝土受拉损伤模型基础上，结合素混凝土受拉应力应变曲线的试验结果，提出了一个新的混凝土分段曲线损伤模型，并利用应力连续条件确定了损伤模型中各系数的值。运用该模型到力学分析中，推导了矩形截面的混凝土梁在纯弯矩作用下，在损伤较小和损伤较大时的力学方程，算出了梁的最大承载能力，并与材料力学计算的梁承载能力进行了对比。详细分析了损伤区域及损伤应力在横截面上的变化过程，确定了极限状态下含损伤混凝土梁的应力分布和相应的承载能力，画出了损伤状态梁截面的应力分布图。

A New Subsection Curve Damage Model of Concrete

Combining the domestic and overseas existing tensile damage models of concrete with the experiment results of tensile stress-strain curve of plain concrete, a new subsection curve damage model of concrete was given, and each coefficient in the damage model was defined by means of stress continuum condition. Applying this model to mechanics analysis, the mechanics equations of a rectangular concrete beam under the action of pure bending were deduced in minor damage cases and major damage cases. The maximum bearing capacity of a damage concrete beam was derived and compared with the result of material mechanics. The variable process of damage area and damage stress on the cross section were studied in detail. Furthermore, the stress distribution and bearing capacity under limit state were determined. The stress distribution diagram in the damage state was drawn.