现役混凝土坝的抗震安全分析

Seismic safety analysis of inservice concrete dams

为了合理评价现役混凝土坝的抗震安全问题,本文通过现场实测数据确定了坝体混凝土在老化过程中形成的损伤。将坝体材料的老化损伤作为初始损伤,以此修正塑性损伤模型,利用该模型对某拱坝进行了抗震安全分析,计算结果表明坝混凝土的老化对坝体动力响应有显著影响,现役混凝土坝的抗震安全评价中应当考虑老化损伤的影响。

To reasonably evaluate seismic safety of inservice concrete dams,the damage caused by the ageing of dam cocrete was obtained based on the field datas in the paper. This ageing damage was regarded as an original damage,and then it was used to modify the the elastoplastic damage model. The renewed model was used to evaluate the seismic safety of an arch dam,the investigation shows that the ageing effects of the concrete on the dam dynamic response is significant and ageing damage should be taken into account in the seismic safety evaluation of the inservice concrete dams.