节点域对钢框架抗震性能实际影响研究
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摘要
对比分析高钢规程层间位移修正与抗震规范节点域设计,指出对于基于我国抗震规范设计的钢框架结构,实质上考虑节点域的模型弹性层间位移略小于轴心线模型,即考虑节点域的模型弹性刚度略高于轴心线模型,并通过钢框架静力弹塑性分析予以验证。根据抗震规范中节点域设计的力学模型背景,确定Krawinkler节点域模型,试验对比分析表明其较为合理。基于我国规范设计的钢框架静力弹塑性分析表明,节点域的塑性变形对层间位移的分布即抗震延性需求分布起到调节作用,使得各层结构延性需求趋于均匀,降低延性需求的过度集中,延缓薄弱层的形成。地震作用下节点域延性系数较大,易引发节点域延性需求与塑性耗能的平衡性问题,应予以重视。
Comparing drift correction of technical specification for steel structure of tall buildings with panel zone seismic design of Code for seismic design of buildings,it is indicated that for the designed steel frame based on China seismic code,in essence,drift of steel frame model considering panel zone is slightly less than taht of centerline model,that is,elastic stiffness of steel frame model considering panel zone is slightly higher than that of centerline model,which is proved by pushover analysis.According to the mechanical model of panel zone used in code for seismic design,Krawinkler model is determined,which is proved reasonable by comparing analysis with test.Based on pushover analysis of steel frame seismic designed by China code,it is determined that plastic deformation of panel zone adjust distribution of drift which is distribution of ductility demand,making story ductility demand more uniform and reducing ductility demand concentration,the formation of weak story is delayed.Panel zone ductility factor is so large that lead to balance problem between ductility demand and plastic energy dissipation,which should be paid attention to.
Comparing drift correction of technical specification for steel structure of tall buildings with panel zone seismic design of Code for seismic design of buildings,it is indicated that for the designed steel frame based on China seismic code,in essence,drift of steel frame model considering panel zone is slightly less than taht of centerline model,that is,elastic stiffness of steel frame model considering panel zone is slightly higher than that of centerline model,which is proved by pushover analysis.According to the mechanical model of panel zone used in code for seismic design,Krawinkler model is determined,which is proved reasonable by comparing analysis with test.Based on pushover analysis of steel frame seismic designed by China code,it is determined that plastic deformation of panel zone adjust distribution of drift which is distribution of ductility demand,making story ductility demand more uniform and reducing ductility demand concentration,the formation of weak story is delayed.Panel zone ductility factor is so large that lead to balance problem between ductility demand and plastic energy dissipation,which should be paid attention to.
引文
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2]许红胜,舒兴平,尚守平.考虑节点域剪切变形的空间钢框架结构分析[J].钢结构,2000,15(02):30-34.
3]ROEDER C W.State of art report on connection perfor-mance[R].Washington,D.C:SAC Joint Venture forthe Federal Emergency Management Agency,2000.
4]EL-TAWIL S,VIDARSSON E.Inelastic behavior anddesign of steel panel zones[J].Journal of StructuralEngineering,1999,125(2):183-193.
5]李国强,沈祖炎.钢框架弹塑性静动力反应的非线性分析模型[J].建筑结构学报,1990,11(2):51-59.
6]李国强,沈祖炎.考虑节点区剪切变形的钢框架弹塑性地震反应分析[J].同济大学学报:自然科学版,1990,18(1):1-9.
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