FRP筋和钢筋混合配筋混凝土梁受弯性能数值模拟及理论分析

近年来,FRP筋和钢筋混合配筋混凝土结构已逐渐成为土木工程界的研究热点问题之一。在试验研究基础上,应用有限元分析软件ANSYS建立了GFRP筋和钢筋混合配筋混凝土梁的数值模型,对其抗弯性能进行了有限元分析,提出了FRP筋和钢筋混合配筋混凝土梁名义配筋面积的概念,并结合中国《纤维增强复合材料建设工程应用技术规范》建立理论模型,对混合配筋混凝土梁的抗弯承载力和挠度进行了理论分析。通过与试验结果对比,证明了有限元模型的精确性以及基于《纤维增强复合材料建设工程应用技术规范》提出的理论计算模型对混合配筋混凝土梁的有效指导性。

NUMERICAL AND THEORETICAL ANALYSIS OF FLEXURAL BEHAVIOR OF HYBRID FRP-STEEL REINFORCED CONCRETE BEAMS

Recently,the reinforced concrete structure with a hybrid combination of FRP and steel bars has already become a hot topic of research in civil engineering community.In this paper,a 3D finite element model of the hybrid FRP/steel reinforced concrete beams was set up using the software ANSYS based on the test data.The whole bending process of the hybrid FRP/steel reinforced concrete beams was analyzed.Then the concept of a nominal reinforcement area of the hybrid FRP/steel reinforced concrete beams was proposed and used to set up a theoretical model combining with the technical code for infrastructure application of FRP composites.The load capacity and deflection of the hybrid FRP/steel reinforced concrete beams were estimated by using the theoretical model.The comparisons between numerical/analytical results and experimental date demonstrate the reliability of both the proposed FE model and the theoretical model.