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。
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.
它主要是由于热处理之后大量保留了稳定的亚组织，提高了材料的强度、塑性指标，而不降低材料的冲击韧性。
The treatment improves the tensile strength and ductility of the alloy without reduction of its impact toughness, chiefly because a large amount of substructure remains in it after the heat treatment.
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