不同跨高比对多层钢框架内填混凝土深梁结构抗震性能影响

Influence of span-depth ratios on the seismic performance of the in-filled concrete deep-beam structure in multi-storey steel frames

为了研究不同跨高比多层钢框架内填混凝土深梁结构的抗震性能,在钢框架内填混凝土深梁滞回性能试验的基础上,利用ABAQUS对六层纯钢框架(结构一)、钢框架内填跨高比为2混凝土深梁结构(结构二)和钢框架内填跨高比为0.75混凝土深梁结构(结构三)进行弹塑性时程分析。结果表明:内填混凝土深梁使结构整体刚度明显增大;在地震波的作用下,结构二的最大顶点位移降低可达58.3%,结构三的最大顶点位移降低可达89.3%,内填混凝土深梁,结构的抗侧移性能得到了极大改善,且随着深梁跨高比的减小而大幅度提升;结构二滞回曲线饱满,呈现纺锤形,混凝土深梁充分起到了第一道防线作用。经济合理的钢框架内填混凝土深梁结构具有一定的工程应用价值。

To study the sesmic performance of the in-filled concrete deep beams in multi-storey steel frames with different span-depth ratios,ABAQUS models are made based the cyclic test to carried out the elastic-plastic time-history analyses for the six-storey pure steel frame(Structure 1),the steel frame with an in-filled concrete deep-beam structure whose span-depth ratio is 2(Structure 2)and the steel frame with an in-filled concrete deep-beam structure whose span-depth ratio is 0.75(Structure 3).It is shown from the results that the in-filled concrete deep beams have made the whole stiffness of the structure increase remarkably.Influenced by seismic waves,the maximum top displacement of Structure 2 can be reduced by 58.3%while that of Structure 3 by 89.3%.It is obvious that the anti-lateral displacement performance of the in-filled concrete deep beams has been improved significantly and upgraded with a large margin along by reducing the span-depth ratios of the deep beam.The hysteretic curve of Structure 2 is plump and spindle-shaped.There is no doubt that the concrete deep beams have fully functioned as the first defensive line.The economic and rational steel frame with an in-filled concrete deep-beam structure is of a certain value in engineering applications.