混凝土桥梁结构非线性地震损伤演化

采用基于断裂能的损伤变量表达式,以单位体积材料当前耗能与断裂能的比值定义损伤变量,考虑了混凝土的拉压异性效应。引入了地震损伤的整体演化指标,通过有限元方法利用材料塑性损伤模型模拟桥梁结构在地震激励下的非线性损伤演化过程。数值计算过程中考虑了混凝土后继屈服的随动强化效应,采用损伤型本构关系及相应的Drucker-Prager型屈服函数,并通过算例验证了混凝土结构的非线性地震损伤特性。

Evolution of Nonlinear Seismic Damage of Concrete Bridge Structure

Based on damage variable expression of fracture energy,ratio of current energy dissipation to fracture energy in unit volume was supplied to define damage variable considered the difference effect of concrete under tension and compression.The total evolution index was induced and the FEM of material plastic damage model was supplied to simulate the nonlinear damage evolution of bridge structure subjected to the earthquake excitation.The kinematic hardening effect with respect to the post yielding of concrete in the process of numerical calculation was considered;the Drucker-Prager type yielding function as well as the damage constitutive relationship was used and authors verified the property of nonlinear seismic damage of the concrete structure through calculated example.