基于材料损伤的混凝土构件损伤评估方法研究
Research on damage assessment method of concrete components based on the material damage
为方便工程应用,定量描述混凝土构件的损伤等级,参考我国现行规范《混凝土结构设计标准》(GB/T 50010—2010)附录C提及的混凝土本构关系,本文提出了一种基于材料损伤的混凝土构件损伤评估方法,根据损伤演化参数的数值,定义构件的损伤等级. 规定当损伤演化参数dc(t)小于混凝土峰值应变εc(t),r对应的损伤演化参数dc(t),r时,混凝土构件处于无损伤状态(L1级);当损伤演化参数dc(t)大于混凝土应变εc(t)u对应的损伤演化参数dc(t)u时,混凝土构件处于严重损伤状态(L6级);当损伤演化参数dc(t)处于二者之间时,通过线性插值的方法定义混凝土构件的损伤等级(L2~L5级). 为验证该方法的合理性,采用ABAQUS软件建立18根梁和2根柱的精细化模型,并对其进行数值模拟,模拟结果与试验结果拟合良好. 依据本文提出的损伤评估方法判定,峰值荷载下的绝大部分梁构件和屈服荷载下的柱构件处于严重损伤状态(L6级). 而采用团体标准《建筑结构抗震性能化设计标准》(T/CECA 20024—2022)提及的基于混凝土受压应变的损伤评估方法判定,绝大部分构件处于中度损伤状态(L4级),少部分构件处于比较严重损伤状态(L5级). 从宏观层面审视,本文提出的基于材料损伤的混凝土构件损伤评估方法评估混凝土构件的损伤更符合实际预期,具有一定参考价值.
To facilitate engineering applications and quantitatively describe the damage level of concrete components, referring to the constitutive model of concrete mentioned in Appendix C of the current Chinese standard “Code for Design of Concrete Structures” GB/T 50010—2010, this paper proposes a damage assessment method for concrete components based on material damage. That is, the damage level of the component is defined according to the values of the damage evolution parameter. It is specified that when the damage evolution parameter dc(t) is less than the damage evolution parameter dc(t),r corresponding to the peak strain of concrete εc(t),r, the concrete component is in a non-damaged state (Level L1); when the damage evolution parameter dc(t) is greater than the damage evolution parameter dc(t)u corresponding to the strain of concrete εc(t)u, the concrete component is in a severely damaged state (Level L6); when the damage evolution parameter dc(t) is between the two values, the damage state of the concrete component (Levels L2 to L5) is evaluated by the linear interpolation method. To verify the rationality of this method, a refined model of 18 beams and 2 columns was established using the ABAQUS software, and numerical analysis were conducted. The simulation results show a good agreement with the test results. According to the damage assessment method proposed in this paper, most of the beam components under the peak load and the column components under the yield load are in a severely damaged state (Level L6). However, when using the damage assessment method based on the compressive strain of concrete as mentioned in the “Standard for Performance-Based Seismic Design of Building Structures” T/CECA 20024—2022, most of the components are in a moderately damaged state (Level L4), while a minor portion of the components are in a relatively severe damaged state (Level L5). From a macroscopic perspective, the damage assessment method for concrete components based on material damage proposed in this paper is more consistent with the actual expectations for evaluating the damage of concrete components and has a certain reference value.
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国家自然科学基金资助项目(52478198)
National Natural Science
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