Y形偏心支撑高强钢框架整体结构抗震性能分析  

Seismic Performance Analysis of High-Strength Steel Frames with Y-Shaped Eccentrically Braces

作　　者：王峥[1] 李慎[2] WANG Zheng;LI Shen(Xi’an Railway Vocational and Technical Institute,Xi’an 710600,China;School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China)

机构地区：[1]西安铁路职业技术学院,西安710600 [2]西安理工大学土木建筑工程学院,西安710048

出　　处：《工业建筑》2024年第7期128-137,共10页Industrial Construction

基　　金：陕西省自然科学研究计划(2021JM-330);陕西省教育厅专项科研计划(20JK0861)。

摘　　要：Y形偏心支撑高强钢框架结构中耗能梁段竖向布置,与框架梁是独立的两个构件,截面设计更加灵活,且塑性变形对框架梁和楼板影响较小,易于震后修复。结构设计中耗能梁段设计为屈服点低于345 MPa的普通钢材,以保证整体结构具有较好的延性与耗能;框架梁、柱等非耗能构件设计为高强度钢材,如Q460或Q690,在保证非耗能构件的弹性受力状态基础上降低构件截面尺寸。耗能梁段长度和结构层数(结构高度)是影响该结构性能的主要因素,考虑两种因素的影响,通过性能化设计方法设计了8,12,16层三组Y形偏心支撑高强钢框架原型结构,每组耗能梁段长度包括700,900,1 100 mm,共计9个模型。通过Pushover分析和动力弹塑性分析,研究了耗能梁段长度和结构层数对结构的破坏模式、刚度、层间侧移角分布、耗能梁段转角变形等影响。研究结果表明:耗能梁段越长,结构的抗侧刚度越弱;所有结构的层间侧移角和耗能梁段转角变形具有类似的分布模式。In the high-strength steel frame with Y-shaped eccentrically braces,the energy-consuming beam,which called links,are arranged vertically,and the frame beams are two independent members,so the cross-sectional design is more flexible,and the plastic deformation has less impact on the frame beams and floor slabs,which is easy to repair after the earthquake.The energy-consuming beam sections were de-signed as ordinary steel with a yield point below 345 MPa to ensure good ductility and energy consumption of the overall structure,while the non-energy-consuming members such as frame beams and columns were designed as high-strength steels,such as Q460 or Q690,to reduce the cross-sectional size of the members ensuring the elastic stress state of the non-energy-consuming members.The length of the links and the num-ber of storeys(height of the structure)were the main factors affecting the performance of the structure.Three sets of prototype structures of high-strength steel frames with Y-shaped eccentric braces with 8,12 and 16 storeys were designed by the performance-based design method,with each set of link length varying from 700 mm,900 mm and 1100 mm,for a total of nine models.The effects of the length of the links and the number of storeys on the failure mode,stiffness,distribution of storey drift and link rotation were inves-tigated by Pushover analysis and dynamic elastoplastic analysis.The results showed that the longer the links,the weaker the lateral stiffness of the structures;the storey drift and the link rotation showed similar distribution patterns for all structures.

关 键 词：耗能梁段 结构层数 Y形偏心支撑 高强钢 层间侧移 

分 类 号：TU391[建筑科学—结构工程] TU352.11