考虑爆裂剥落效应的高强混凝土剪力墙抗火性研究

高强混凝土剪力墙是现代高层建筑中广泛使用的结构构件，其抗火性能对结构的整体稳定性和抗火设计具有十分重要的意义。受高强混凝土在高温下的爆裂剥落影响，高强混凝土剪力墙在火灾条件下具有很高的结构失效风险性。然而，目前仍然缺少能够较为精确的预测高强混凝土剪力墙抗火性能的理论模型，对受爆裂剥落影响高强混凝土剪力墙的抗火性能仍缺乏较为深入的研究。本项目通过建立同时考虑高温下不均匀爆裂剥落、混凝土瞬态徐变以及材料和几何非线性的预测高强混凝土剪力墙在火灾下变形和失效的理论模型，结合模拟火灾试验，研究爆裂剥落作用下高强混凝土剪力墙在火灾下的变形特征、失效机理和抗火性规律，揭示高强混凝土剪力墙火灾下爆裂剥落的关键影响参数及其影响机理，建立高强混凝土剪力墙火灾下爆裂剥落与材料和结构关键参数之间的相关关系式，并最终提出基于关键参数的高强混凝土剪力墙抗火性的预测方法。

High-strength concrete shear walls are widely used in modern high-rise buildings, and its fire resistance performance is of great significance to the overall stability and fire resistance design of the structure. Affected by the explosive spalling of high-strength concrete at high temperatures, high-strength concrete shear walls have a high risk of structural failure under fire conditions. However, there is still a lack of theoretical models that can accurately predict the fire resistance performance of high-strength concrete shear walls, and a lack of in-depth research on the fire resistance performance of high-strength concrete shear walls considering the explosive spalling effects. This project establishes a theoretical model for predicting the deformation and failure of high-strength concrete shear walls under fire considering uneven spalling and transient creep of concrete at high temperatures, and the material and geometrical nonlinearities. Combined with simulated fire tests, the model is applied to study the effects of explosive spalling on the deformation characteristics, failure mechanism and fire resistance characteristics of high-strength concrete shear walls under fire. The critical parameters affecting the explosive spalling of high-strength concrete shear walls under fire and the mechanism will be revealed, and the quantitative relationship between the fire-induced explosive spalling of high-strength concrete shear walls and the critical material and structural parameters will be established. Finally, a parameter-based prediction formula will be proposed for the fire resistance of high-strength concrete shear walls.