摘要
含端板螺栓连接耗能梁段的高强钢框筒结构(SFTSs)可以有效改善传统钢框筒结构的抗震性能,且可实现震后功能可快速恢复,是一种新型的高层可恢复功能结构。由于现行规范的抗震设计方法无法准确预测和控制结构的弹塑性性能,可能会使结构损伤集中于个别楼层出现薄弱层。为了设计具有理想失效模式的SFTSs,建立该结构体系“小震不坏,中震及大震可修,巨震不倒”的四水准抗震设防性能指标。考虑不同地震水准作用下的性能目标,采用三线型的能力曲线对传统的基于能量平衡的塑性设计方法进行改进,且考虑结构高阶振型和屈服后刚度的影响,提出了SFTSs基于性能的塑性设计方法。采用建议的设计方法设计了一个30层的结构算例,并基于OpenSees对结构算例进行弹塑性时程分析。结果表明:采用提出的设计方法设计的结构算例能够实现结构预期的失效模式以及不同地震水准作用下的性能目标,结构具有良好的抗震性能,验证了所提出的基于性能的塑性设计方法的有效性,可以为SFTSs的工程设计提供参考。
High-strength steel framed-tube structures with end-plate connected shear links(SFTSs)is an innovative high-rise earthquake-resilient structural system.It improves the seismic performance of conventional steel framed-tube structures and achieves rapid post-earthquake repairability.Since the traditional seismic design method based on the current code cannot accurately predict and control the inelastic performance of the structure,the damage of the structure may be concentrated on individual floors,thus forming a weak layer.To design a structure with an ideal failure mode,we propose a specific four-level seismic fortification objective for SFTSs,which requires no damage under frequent earthquakes,replaceable under the design and rare earthquakes,and collapse prevention under very rare earthquakes.A trilinear capacity curve considering multiple performance objectives under different seismic levels was adopted in the proposed performance-based plastic design method of SFTSs.The effects of higher mode shapes and post-yield stiffness were also considered.A 30-story SFTS model was designed according to the proposed method.Nonlinear time history analyses of the model were performed under 20 selected ground motions using OpenSees.The results demonstrate that the model designed with the proposed design method exhibited the intended failure mode and achieved the performance objectives under the different seismic levels,indicating excellent seismic performance of the model.The effectiveness of the proposed performance-based plastic design method of SFTSs was verified,which can be applied to the practical engineering design of SFTSs.
作者
程倩倩
连鸣
苏明周
张浩
关彬林
CHENG Qian-qian;LIAN Ming;SU Ming-zhou;ZHANG Hao;GUAN Bin-lin(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an,Shaanxi 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi’an,Shaanxi 710055,China)
出处
《工程力学》
EI
CSCD
北大核心
2021年第7期167-182,共16页
Engineering Mechanics
基金
国家自然科学基金项目(51708444)。
关键词
钢框筒
耗能梁段
塑性设计
性能目标
失效模式
抗震性能
steel framed-tube
shear link
plastic design
performance objective
failure mode
seismic performance
作者简介
程倩倩(1994−),女,山西人,博士生,主要从事新型钢结构体系抗震性能与设计方法研究(E-mail:chengqianqian0599@163.com);通讯作者:连鸣(1987−),男,山东人,副教授,博士,硕导,主要从事新型钢结构体系抗震性能与设计理论研究(E-mail:lianming@xauat.edu.cn);苏明周(1971−),男,河南人,教授,博士,博导,主要从事钢结构稳定与抗震、新型结构体系受力性能和设计理论研究(E-mail:sumingzhou@163.com);张浩(1993−),男,陕西人,博士生,主要从事新型钢结构体系抗震性能研究(E-mail:zhanghao930219@163.com);关彬林(1989−),男,湖北人,博士生,主要从事新型钢结构体系抗震性能研究(E-mail:guanbinlin@163.com).
