基于多尺度建模的震损RC框架抗火混合模拟

基于构件的震后火灾试验无法全面真实反映整体结构历经地震损伤后局部构件的受火性能，采用ABAQUS软件建立不同损伤组合下的钢混框架有限元模型，并将多尺度建模方法与抗火混合模拟相结合，研究不同建模方式的计算结果差异、不同损伤组合对结构耐火极限的影响，以及抗火混合模拟评估结构震后火灾性能的适用性。结论表明：相对微观单元模型，多尺度单元模型的计算时间在裂缝损伤下和裂缝与剥落共同作用损伤下分别缩短68%和61%，裂缝与剥落共同作用损伤较裂缝损伤耐火极限降低22%，由于考虑了边界条件的变化，抗火混合模拟能够通过局部构件试验反映整体结构的震后抗火性能。

Fire resistance hybrid simulation of earthquake damaged RC frame based on multi-scale modeling

The post-earthquake fire test based on components cannot fully and truly reflect the fire performance of local components of the overall structure after earthquake damage, therefore, ABAQUS software is used to establish the finite element of the steel-concrete frame under different damage combinations. The model combines multi-scale modeling methods with fire-resistance hybrid simulation to study the calculation results of different modeling methods, the influence of different damage combinations on the fire resistance limit of the structure, and the applicability of the fire-resistance hybrid simulation to evaluate the fire performance of the structure after earthquake. The conclusions show that the calculation time of the multi-scale element model is reduced by 68% and 61%, respectively, under the crack damage and the joint action of cracks and spalling compared with the micro-element model. The joint action of cracks and spalling is 22% lower than the fire resistance limit of crack damage. As the changes in boundary conditions are taken into account, the fire-resistance hybrid simulation can reflect the post-earthquake fire performance of the overall structure through partial component tests.