基于纤维模型的火后钢筋混凝土框架构件性能模拟  

Simulation of Post-fire Structural Performance of Reinforced Concrete Framesased on the Fiber Beam Model

作　　者：杨旭[1] 陆洲导[1] 余江滔[1] 刘书雷[1] 

机构地区：[1]同济大学结构工程与防灾研究所,上海200092

出　　处：《结构工程师》2014年第6期33-40,共8页Structural Engineers

基　　金：国家自然科学基金(51008235)(51378397)

摘　　要：对钢筋混凝土框架整体结构中梁、柱、板构件截面进行离散,并对高温损伤后构件(梁、板)截面中的纤维赋予相应温度的材性,对板采用分层壳单元模型,并赋予每层单元相应温度的材性,使受损构件和非受损构件结合组成整体框架结构。利用SAP2000方便快速的建模功能,然后导入ABAQUS中,利用其强大的非线性分析功能进行高温后框架整体力学性能的分析。通过对比发现:荷载—位移曲线、应变等与试验结果吻合较好,表明该方法可靠。借助这种方法,进一步进行了悬臂梁、框架梁火后的应变比较和荷载位移曲线比较并探究其规律,结果表明:翼缘对悬臂梁的承载力和刚度的提高幅度较大,翼缘对框架梁的影响较小。A frame structure with damaged and undamaged members was modelled by assembling the rein-forced concrete beam, column, floor members. Material properties of the damaged members after high temper-ature were considered. By using the convenient and fast modeling function of SAP2000, beams and columns were modeled by fiber elements and the layered shell elements were used to model the floor. This model was then imported into the ABAQUS for nonlinear analysis. It was found that the load-displacement curves and strain curves are in good agreement with experiment results. Based on this method, further investigations were made to compare the strain curves and load displacement curves of cantilever beams and frame beams after fire. The results shows that the bearing capacity and stiffness of the cantilever beam increase more than those of the frame beam with the flange contributions.

关 键 词：纤维模型 钢筋混凝土框架 非线性有限元分析 高温后力学试验 程序开发 

分 类 号：TU375.4[建筑科学—结构工程]