基于改进微平面本构模型的RC桥墩地震损伤评价方法

项目名称： 基于改进微平面本构模型的RC桥墩地震损伤评价方法

项目编号： No.51508190

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 建筑科学

项目作者： 贾明晓

作者单位： 华北水利水电大学

项目金额： 20万元

中文摘要： 针对桥梁抗震设计中桥墩地震损伤评价的基本问题和难点，应用混凝土微平面本构模型，从细观的角度分析桥墩的损伤演变过程和机理。应用球面几何知识，改进现有混凝土微平面本构模型的微平面划分方法，使微平面取向与权重的概念更直观明确，优化积分离散计算结果。通过数理分析，揭示细观与宏观之间的映射关系，改进微平面应力-应变关系，简化模型参数并明确物理意义，从细观的角度阐释宏观力学现象。基于微平面取向和权重概念的思想建立考虑钢筋分布特点的配筋混凝土本构模型，用于结构数值计算。结合理论分析，数值计算和结构试验，研究细观与宏观，材料与构件之间损伤的内在联系规律。提出钢筋混凝土桥墩地震损伤评价方法，确定具体的量化指标，为桥墩抗震设计与安全评估提供决策依据。

中文关键词： 微平面本构模型；；钢筋混凝土桥墩；地震损伤；数值计算；拟动力试验

英文摘要： Earthquake damage assessment is the basic problem and difficulty for bridge seismic design. The pier damage process and mechanism has been described from the microscopic perspective applying microplane constitutive model. A new microplane grid division method is derived from spherical geometry theory which clarifying the concept of microplane orientation and weights and optimizing the discretization algorithm analysis. Based on mathematical analysis, mapping relations between microscopic and macroscopic is revealed. The microplane stress-strain relationship is improved which simplifying the model parameters and clearing its physical meaning. The macroscopic mechanics phenomenon is explained from microscopic point of view. Steel reinforced concrete constitutive model is established for structural numerical calculation which can consider steel distribution characteristics based on the idea of microplane orientation and weight concept. Based on theoretical analysis, numerical and structural testing, the intrinsic relation between microscopic and macroscopic, the material and component damage is studied. The seismic damage evaluation method for reinforced concrete bridge piers is proposed and the specific quantitative index is identified which bring decision-making basis for bridge pier seismic design and safety assessment.

英文关键词： microplane constitutive model;reinforced concrete pier;seismic damage;numerical calculation;Pseudo-dynamic test