【摘要】 将变形加固理论拓展到非线性有限元时程分析中,建立高拱坝-坝肩结构抗震稳定评价与加固设计体系:结构动力塑性余能定义为欧氏应力空间协调动平衡应力场与协调稳定应力场距离的平方,以此作为结构整体抗震稳定评价指标,确定结构动力破坏程度较大的若干时刻。这些时刻不平衡力分布则表征了结构动力破坏的主导形态与程度。根据最小塑性余能原理,不平衡力就是维持结构稳定所需最优加固力的反力,据此更有针对性地指导抗震加固设计。对马吉高拱坝-坝肩结构进行抗震稳定与加固分析,结果表明拱坝上部坝肩是其抗震薄弱部位,并给出其最优加固力分布。该应用表明,基于变形加固理论的结构抗震稳定评价与加固设计体系对大型实际工程具有实用性。更多还原

【Abstract】 The deformation reinforcement theory is introduced into nonlinear FE time history analysis to establish a system of the aseismatic stability evaluation and reinforcement design of high arch dam-abutment structure.In this system,the dynamic plastic complementary energy is defined as the square of the Euclidean space distance between two compatible stress fields controlled by dynamic equilibrium and constitutive relation respectively,and it is regarded as an evaluation criterion of global aseismatic stability.This criterion can be used to find the moments when high level dynamic damages occur,and the distributions of unbalanced force at these critical moments reveal the dominant patterns and extents of the damages.By the principle of minimum plastic complementary energy,the unbalanced force is just the counterforce of optimal reinforcement force to stabilize the structure,which makes the aseismatic reinforcement design more targeted and effective.An analysis of the aseismatic stability and reinforcement is performed for the Maji high arch dam-abutment structure.The results show that the upper abutment is the most vulnerable under earthquake actions,and how the optimal reinforcement force there is distributed.This case study indicates that the established system has a good applicability to large-scale practical projects.更多还原