基于纤维模型的火后钢筋混凝土框架构件性能模拟

发布时间：2018-02-24 02:07

本文关键词： 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　出处：《结构工程师》2014年06期 　论文类型：期刊论文

【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。
[Abstract]:The section of beam, column and slab in the whole structure of reinforced concrete frame is discretized, and the fiber in the section of member (beam, slab) after high temperature damage is endowed with the material property of corresponding temperature, and the laminated shell element model is used for the plate. At the same time, each layer unit is endowed with the material property of corresponding temperature, so that the damaged member and the non-damaged member combine to form the whole frame structure. The modeling function of SAP2000 is convenient and fast, and then it is imported into ABAQUS. The mechanical properties of frame after high temperature are analyzed by using its powerful nonlinear analysis function. It is found that the load-displacement curve and strain are in good agreement with the experimental results, which indicates that the method is reliable. Furthermore, the strain comparison and load-displacement curve comparison of cantilever beam after fire are carried out. The results show that the flange increases greatly the bearing capacity and stiffness of the cantilever beam, while the flange has little effect on the frame beam.
【作者单位】：同济大学结构工程与防灾研究所;
【基金】：国家自然科学基金(51008235)(51378397)
【分类号】：TU375.4

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