纤维增强高性能装配式钢筋混凝土梁柱结构抗震性能分析

Seismic Performance Analysis of Fiber Reinforced High Performance Prefabricated Reinforced Concrete Beam Column Structure

为了提升装配式混凝土梁柱结构的抗震性能,在大掺量粉煤灰混凝土基础上,通过掺入PVA纤维材料对混凝土进行改良,制成高性能装配式钢筋混凝土梁柱结构,并在梁柱节点构造方式进行了改良。结果显示:纤维增强高性能装配式钢筋混凝土梁柱结构抗震性能明显优于普通装配式梁柱结构,前者具有更好的承载力、延性变形能力和耗能能力;对纤维增强装配式梁柱节点附加钢筋,可进一步提升节点的承载力和耗能能力,但可能会造成梁柱塑性铰区发生严重的剪切破坏;对纤维增强装配式梁柱节点外伸悬臂段时,节点构造不仅具有较好的抗震性能,而且裂缝扩展顺序呈现出与现浇钢筋混凝土梁柱等同的特点,能够避免薄弱面的形成。

In order to improve the seismic performance of prefabricated concrete beam column structure,on the basis of large amount of fly ash concrete,the high performance prefabricated reinforced concrete beam column structure is made by adding PVA fiber material to improve the concrete,and the structural mode of beam column joint is improved.The results are as follows:the seismic performance of fiber reinforced high performance prefabricated reinforced concrete beam column structure is obviously better than that of ordinary prefabricated beam column structure,and the former has better bearing capacity,ductility deformation capacity and energy dissipation capacity;the additional reinforcement can further improve the bearing capacity and energy dissipation capacity of the fiber-reinforced prefabricated beam column joints,but it may cause serious shear failure in the plastic hinge area of the beam column;when the cantilever section of fiber-reinforced prefabricated beam column joint is extended,the joint structure not only has good seismic performance,but also has the same characteristics as cast-in-place reinforced concrete beam column,which can avoid the formation of weak surface.