西安建筑科技大学学报(自然科学版)

当门式刚架结构高度较大时,设置多层柱间支撑可为刚架柱提供侧向支承点以减小柱平面外计算长度,从而减小柱截面并节省钢材,是一种合理的做法,然而对采用多层支撑的门式刚架结构纵向抗震性能研究较少.为研究门式刚架结构采用多层柱间支撑时结构的纵向抗震性能,采用有限元软件ABAQUS对按现行相关规范设计的五个门式刚架结构在纵向地震作用下的抗震性能进行了动力弹塑性时程分析,研究多层柱间支撑门式刚架结构在纵向地震作用下的受力性能、破坏机理.结果表明:多遇地震作用下,结构纵向侧移较小,满足变形要求; 罕遇地震作用下,结构纵向存在侧移不均匀、支撑塑性破坏及刚架柱在支撑平面内弯曲等问题,不满足抗震要求.本研究深入分析了产生以上问题的原因,为该结构纵向抗震性能的理论分析和工程实践提供参考.

Multi-tiered bracing configuration, which can provide laterally brace in the plane of the brace at every strut level for column of portal frame structure and also reduces the steel tonnage, is commonly used in tall open single story portal frame structures. However, there are few researches on the longitudinal seismic behavior of portal frame structures with multi-tiered bracing configuration. In order to study the longitudinal seismic performance of multi-tiered steel concentrically braced portal frame structure, a finite element analysis of portal frame structure was performed to simulate the overall elasto-plastic time-history process with FEM program ABAQUS to determine some seismic performances, including mechanical behavior, failure mode etc,. The results show that the structure meet the requirements of structural longitudinal degeneration under frequent earthquakes and may exhibit unsatisfactory seismic response including evenly drift and brace deformation demand under serve earthquake. Study further analyzes the causes of the above problems to provide reference for the future theoretical analysis and engineering practice.

引言
1 门式刚架结构设计
2 有限元模型
3 弹塑性动力时程分析
4 结论

图1 多层支撑形式<br/>Fig.1 Geometry of steel multi-tiered brace

图1 多层支撑形式
Fig.1 Geometry of steel multi-tiered brace

表1 门式刚架试件参数<br/>Tab.1 Parameters of portal frame specimen

表1 门式刚架试件参数
Tab.1 Parameters of portal frame specimen

表2 结构荷载表/kN·m-2<br/>Tab.2 Structural load table/kN·m-2

表2 结构荷载表/kN·m-2
Tab.2 Structural load table/kN·m-2

表3 吊车荷载表/kN<br/>Tab.3 Crane load table/kN

表3 吊车荷载表/kN
Tab.3 Crane load table/kN

表4 柱顶最大侧移角<br/>Tab.4 Maximum story drift

表4 柱顶最大侧移角
Tab.4 Maximum story drift

图2 底部剪力法示意图<br/>Fig.2 Diagram of bottom shear method

图2 底部剪力法示意图
Fig.2 Diagram of bottom shear method

表5 重力荷载代表值/kN<br/>Tab.5 Representative value of gravity load/kN

表5 重力荷载代表值/kN
Tab.5 Representative value of gravity load/kN

表6 GJ-1构件设计信息<br/>Tab.6 Member design information of GJ-1

表6 GJ-1构件设计信息
Tab.6 Member design information of GJ-1

表7 门式刚架试件各构件尺寸/mm<br/>Tab.7 Member dimension of portal frame specimen/mm

表7 门式刚架试件各构件尺寸/mm
Tab.7 Member dimension of portal frame specimen/mm

图3 有限元模型及网格划分<br/>Fig.3 Finite element model and mesh partition

图3 有限元模型及网格划分
Fig.3 Finite element model and mesh partition

图4 残余应力施加<br/>Fig.4 Residual stress application

图4 残余应力施加
Fig.4 Residual stress application

表8 地震波信息<br/>Tab.8 Ground acceleration records

表8 地震波信息
Tab.8 Ground acceleration records

表9 多遇地震作用下构件柱顶侧移角<br/>Tab.9 The top's lateral angle under frequent earthquake

表9 多遇地震作用下构件柱顶侧移角
Tab.9 The top's lateral angle under frequent earthquake

图5 GJ-4在赤津波作用下的层间侧移角时程曲线<br/>Fig.5 Tier drifts time-history curve of GJ-1 under the Cheutsu-oki

图5 GJ-4在赤津波作用下的层间侧移角时程曲线
Fig.5 Tier drifts time-history curve of GJ-1 under the Cheutsu-oki

图6 刚架GJ-1在伊尔皮尼亚地震波作用下10.5 s时的变形<br/>Fig.6 Deformed shape of GJ-1 under the Irpinia(t=10.5 s)

图6 刚架GJ-1在伊尔皮尼亚地震波作用下10.5 s时的变形
Fig.6 Deformed shape of GJ-1 under the Irpinia(t=10.5 s)

表10 层间位移角破坏指标界限<br/>Tab.10 Damage index boundaries

表10 层间位移角破坏指标界限
Tab.10 Damage index boundaries

图7 刚架GJ-1在伊尔皮尼亚地震波作用下的动力响应<br/>Fig.7 Dynamic response of GJ-1 under the Irpinia

图7 刚架GJ-1在伊尔皮尼亚地震波作用下的动力响应
Fig.7 Dynamic response of GJ-1 under the Irpinia

图8 GJ-1在伊尔皮尼亚地震波作用下支撑的轴力响应<br/>Fig.8 Brace axial forces Response of GJ-1 under the Irpinia

图8 GJ-1在伊尔皮尼亚地震波作用下支撑的轴力响应
Fig.8 Brace axial forces Response of GJ-1 under the Irpinia

表11 七种波作用下试件动力响应平均值<br/>Tab.11 Average value of dynamic response of seven ground acceleration records

表11 七种波作用下试件动力响应平均值
Tab.11 Average value of dynamic response of seven ground acceleration records

图9 GJ-4在兰德斯地震波作用下的轴力和变形<br/>Fig.9 Brace axial forces and deformed shape of GJ-4 under the Landers

图9 GJ-4在兰德斯地震波作用下的轴力和变形
Fig.9 Brace axial forces and deformed shape of GJ-4 under the Landers

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备注

引言

1 门式刚架结构设计

2 有限元模型

3 弹塑性动力时程分析

4 结论

期刊信息