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中文摘要：
为了探讨预静载对全级配混凝土梁动弯拉强度的影响，本文从全级配混凝土的细观层次出发，将梁的纯弯段视为由水泥砂浆、粗骨料及两者间的黏结带所组成的复合材料。采用既考虑应变率强化效应又计及损伤弱化效应的动态本构模型反映细观单元的损伤退化。通过自编的以位移控制的有限元程序对全级配混凝土梁在不同预静载作用下的破坏机制进行了数值模拟，给出了相应的应力一应变曲线和动弯拉强度。计算结果显示：全级配混凝土梁的动弯拉强度随着预静载的增加而上升。
英文摘要：
To find the influence of initial static loading on the dynamical bending strength of the fully-graded concrete beam, the pure bending section of fully-graded concrete beam is consider as a three-phase composite composed of matrix, aggregate and interface between them on meso-level. Dynamic constitutive model which consider the strain rate strengthening effect and the damage softening effect is adopted to describe the concrete and meso- element＇ s damage. The failure mechanism of beam under different initial static loading was simulated using displacement-controlled FEM, furthermore, the stress-strain curve of the specimen and its dynamical bending strength were got. The calculation results show that the dynamical bending strength of fully-graded concrete beam would increase along with the initial static loading increasing.
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