【摘要】 该文应用塑性-损伤耦合模型和钢筋刚化方法,分别模拟混凝土损伤开裂和钢筋-混凝土相互作用效应,然后基于仿真计算分析梁向配筋前后高拱坝的地震非线性响应,研究该抗震措施的加固效果。仿真分析显示,梁向配筋措施可以降低强震下拱坝横缝张开位移与顶拱相对变形,减小坝体中上部开裂区域的裂缝张开位移,限制沿坝厚方向的裂缝扩展范围,有助于提高拱坝的抗震安全性能。然而,建议配筋方案的加固效果仍不能满足工程要求,特别是坝踵区域开裂严重,直接威胁拱坝整体安全,而梁向偏配筋措施对限制坝踵开裂的效果不显著;同时,上游配筋范围未能完全覆盖开裂区域,应对建议配筋方案进行改进和优化。更多还原

【Abstract】 To investigate the strengthening effect of cantilever reinforcement,a plastic-damage model of concrete and the steel-stiffening approach for modeling steel-concrete interaction are used to analyze the seismic response of high arch dam with and without the presence of reinforcement.The calculated results show that this measure reduces the nonlinear response of an arch dam,e.g.joint opening and the relative deformation of dam crest,and limits the extension and opening width of cracks.It is concluded that cantilever reinforcement is beneficial to improving the earthquake-resistant capacity of the arch dam.The results also show that the strengthening effect of the proposed reinforcement is insufficient for the engineering demand.Therefore,cantilever reinforcement should be modified and optimized for the arch dam.更多还原