施工期裂缝对拱坝静动力响应的影响

本文简要介绍拉格朗日不连续变形分析（LDDA）和以黏弹性边界为吸能边界的地震输入方法。用LDDA模拟拱坝横缝、诱导缝和施工期温度裂缝,对西南地区某300米级高拱坝进行有限元网格剖分,研究对比有、无施工期温度缝情况下坝体的静动位移和应力,温度缝的张开和滑移以及缝端的应力。得出以下结论：施工期温度缝可明显增加静位移,但动位移相差不大,作为衡量裂缝扩展的缝端应力未超过混凝土的抗拉强度。

Effects of crack at construction stage on the static and dynamic responses of arch dam

This paper briefly introduces a Lagrange discontinuous deformation analysis(LDDA) and an earthquake input method using viscoelastic boundary for absorbing boundary.To analyze a high arch dam of 300m-grade high in southwest China with FEM,a LDDA method is used to simulate its contraction joints,inducing joints and construction-stage temperature cracks.The static and dynamic displacements and stresses of the arch dam,the joint opening and slip and the stress at joint end are studied by comparing the cases with and without temperature cracks.The results show that the construction-stage cracks of the dam can cause a significant increase in static displacement and a small variation in dynamic displacement and that the joint end stress,a measure of crack expansion,is below the tensile strength of concrete.