基于BIM的建筑地震受损程度评估模型设计

由于在变形和累积耗能的建筑地震受损程度评估模型，是将建筑划分为五个状态水平，未研究建筑环境性能，评估结果误差较大。因此设计基于BIM的建筑地震受损程度评估模型，采用基于BIM的建筑环境研究与评估方法，考虑建筑环境性能，基于这个思路，依据混凝土单轴Mazars损伤模型，获取三轴状态中的损伤演化方程，得到应变大于损伤阈值时损伤演化方程增量形式，构建混凝土损伤评估模型。经实验证明，所设计模型在地震峰值加速度小于0.31g时，建筑结构大致无缺，在峰值加速度是0.61g时，建筑地震受损指数超过0.8，建筑倒塌；所设计模型评估的平均误差低于0.03，平均评估时间是2.86 s，说明所设计模型能够有效评估建筑地震受损程度，且精度和效率较高。

Design of a BIM-based Model for Assessing the Degreeof Building Damage after an Earthquake

While using the assessment model of the degree of earthquake damage to buildings based on deformation and accumulated energy consumption, the buildings were divided into five state levels, and the environmental performance of the buildings was not studied, resulting in large errors in the evaluation results. A building information modeling (BIM)-based assessment model was designed in this study for evaluating the degree of building damage after an earthquake. The BIM-based evaluation method of the building environment was used to study the environmental performances of buildings. On this basis, the damage evolution equation was obtained based on the Mazars damage model of concrete under the triaxial condition, and the increment equation of damage evolution was obtained when the strain was greater than the damage threshold. Further, the concrete damage assessment model was constructed. It has been experimentally proved that the building structure is generally intact when the peak acceleration of the earthquake is less than 0.31g; however, when the peak acceleration is 0.61g, the building earthquake damage index exceeds 0.8, and the building collapses. The average error of the designed model was less than 0.03; the average evaluation time was 2.86 s, indicating that the designed model can effectively assess the degree of earthquake damage for a building and that the accuracy and efficiency are relatively high.