基于ETA模型的配筋措施对于高拱坝变形损伤指标的影响

混凝土拱坝在不同强度超载地震作用下的动力响应，对拱坝抗震裕度评估有着深远的影响，如何评价配筋措施的效果成为一个重要问题。基于耐震时程分析（ETA）法，研究了不同地震强度下，高拱坝是否采用配筋抗震措施对于坝体损伤变形指标的影响。首先对ETA方法、坝体材料本构、横缝模型以及地震动输入方法进行了介绍。然后分别建立了高拱坝采用配筋抗震措施和未采用配筋抗震措施拱坝的数值模型，同时基于ETA方法生成不同地震强度的耐震时程。分析在不同地震强度下，高拱坝是否采用配筋抗震措施的损伤分布、横缝开度以及变形等响应，提出了高拱坝损伤体积比、平均横缝开度以及拱冠梁变形等坝体损伤变形指标。通过对比高拱坝配筋和未配筋的情况下得出的动力响应指标，研究配筋措施对高拱坝响应以及损伤变形指标趋势、相关性以及离散性的影响。计算结果表明:在不同的地震动强度条件下，配筋措施对减小高拱坝的整体损伤是有效的，对横缝开度及位移影响有限，配筋措施可以减小地震随机性导致的损伤变形指标离散。同时，归一化的损伤变形指标表明损伤变形指标有一定的相关性。

Influence of Reinforcement Measures on Deformation Damage Index of High-Arch Dam Based on Endurance Time Analysis Model

The dynamic response of concrete arch dam under the action of overloaded earthquakes with different strengths has a profound impact on the assessment of seismic dam seismic margin. How to evaluate the effect of reinforcement measures has become an important issue. Based on the endurance time analysis (ETA) method, the effect of the use of reinforced seismic measures on the damage and deformation indicators of the dam under different seismic intensities was studied. First, the ETA method, dam material constitutive model, transverse joint model and ground motion input method are introduced. Then the numerical models of arch dams with reinforced and non-reinforced seismic measures for high arch dams were established respectively, and the seismic durations of different earthquake strengths were generated based on ETA method. The damage distribution, transverse joint opening and deformation response of high arch dams with reinforced seismic measures under different earthquake intensities are analyzed, and the damage volume ratio, average transverse joint opening and arch crown beam deformation of high arch dams are proposed Body damage and deformation indicators. By comparing the dynamic response indexes of high arch dams with and without reinforcement, the effects of reinforcement measures on the trend, correlation and dispersion of high arch dam response and damage and deformation indexes are studied. The calculation results show that under different ground motion strength conditions, the reinforcement measures are effective to reduce the overall damage of the high arch dam, and have a limited impact on the opening and displacement of the joints. The reinforcement measures can reduce the randomness caused by the earthquake Damage and deformation indicators are discrete. At the same time, the normalized damage and deformation index shows that the damage and deformation index has a certain correlation.