轴向约束型钢RPC混凝土异形柱耐火性能研究

Study on the Fire Resistance Performance of Axially Constrained Steel-RPC Concrete Irregular Columns

为考察分析受轴向约束的型钢活性粉末混凝土(Reactive Powder Concrete,RPC)异形柱的耐火性能,采用有限元软件ABAQUS构建火灾下型钢RPC混凝土异形柱热-力顺序耦合模型,并探究加载角、荷载比、偏心率等参数对其耐火性能的影响规律。研究表明:在一定加载角度范围内,型钢RPC混凝土异形柱的抗火性能随加载角的增大而增大;荷载比和偏心率也是影响型钢RPC混凝土异形柱耐火性能的重要因素,随着荷载比和偏心距的增大,构件的耐火极限相应降低。型钢RPC混凝土异形柱的耐火性能受偏心率、荷载角、荷载比等因素的影响逐渐增加,最终都表现为脆性破坏,其轴向变形呈现出基本恒定、缓慢下降和线性下降三个阶段。研究结果可为该类结构的防火设计提供理论依据。

To investigate and analyze the fire resistance performance of steel-Reactive Powder Concrete(RPC)irregular columns under axial constraints,this paper uses the finite element software ABAQUS to construct a thermo-mechanical sequentially coupled model of steel-RPC concrete irregular columns under fire conditions.It explores the influence of parameters such as loading angle,load ratio,and eccentricity on their fire resistance performance.The study indicates that within a certain range of loading angles,the fire resistance of steel-RPC concrete irregular columns increases with increasing loading angle.Load ratio and eccentricity are also important factors affecting the fire resistance performance of steel-RPC concrete irregular columns;as the load ratio and eccentricity increase,the fire resistance limit of the component decreases accordingly.The fire resistance performance of steel-RPC concrete irregular columns is increasingly affected by factors such as eccentricity,loading angle,and load ratio,ultimately manifesting as brittle failure,with axial deformation showing three stages:essentially constant,slowly decreasing,and linearly decreasing.The research findings provide a theoretical basis for the fire-resistant design of such structures.