【摘要】 混凝土坝遭遇强烈地震导致坝体严重受损已有先例。工程界建议布置坝面钢筋以提高坝体抗震性能。基于此,本文应用嵌入式滑移模型和钢筋刚化模型模拟混凝土重力坝配筋前后的地震动力响应,据此评价坝面配筋措施的抗震效果。计算结果显示,配筋前后结构整体响应基本一致,但布置坝面钢筋后坝体裂缝由集中裂缝分散为多条裂缝,裂缝张开位移和扩展深度较配筋前减小;此外,钢筋滑移对坝体裂缝分布形态也有一定影响。研究表明:配置坝面钢筋对限制与分散混凝土开裂将起到一定的作用,有助于提高混凝土坝抗震性能。更多还原

【Abstract】 Several concrete dams have suffered severe damage under strong earthquake.The reinforcement concept has been advanced to improve the seismic-resistant capacity of dams.The dynamic response of a concrete dam before and after strengthening has been simulated by the embedded slip model and the reinforcement stiffening model respectively.The global response results after reinforcement are almost consistent with those before reinforcement.However,the cracking behavior of concrete is significantly affected by reinforcement interactions,especially accounting for bond-slip effects.A major crack formed before strengthening is becomed into several cracks after strengthening and the maximum CODs(ckack opening displacements) significantly decrease at the same time. The results show that the reinforcement is a useful measure to improve the earthquake-resistant capacity of concrete dams.更多还原