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常规的弹塑性模型由于没有考虑到损伤对结构强度的影响,常常得到高于结构实际承载力的应力分布,难以模拟破坏时由于内部损伤的累积导致的变形增加和承载力降低.将规范应力应变曲线进行简化,推导出弹塑性损伤模型曲线,采用简支纯弯梁验证了该简化模型的正确性,然后将该模型应用于深溪沟水电站预应力闸墩非线性有限元分析.计算结果表明考虑结构弹塑性损伤较线弹性分析能更好反应结构真实受力特性,计算结果对预应力钢筋的布置和闸墩的设计具有指导意义.
The conventional elastic-plastic model can not simulate the increase of the deformation and the decrease of the bearing capacity due to the accumulation of internal damage, because the influence of the damage on the strength of the structure is not taken into account, and the stress distribution higher than the actual bearing capacity of the structure is often obtained. The curve is simplified and the curve of elastic-plastic damage model is deduced. The simplified model is validated by the simply supported beam, and then the model is applied to the nonlinear finite element analysis of prestressed pier in Shenxigou Hydropower Station. Compared with linear elastic analysis, the elastic-plastic damage of structure can better reflect the true stress characteristics of the structure, and the calculation results have guiding significance for the arrangement of prestressed reinforcement and the design of pier.