ANALYSIS ON COLLAPSE VULNERABILITY OF BRB STEEL FRAMES BASED ON COMPONENT DAMAGE
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摘要: 构件参与结构抗震的贡献不同,传统结构地震易损性评价指标不能反映此特点,亦不能准确合理评价结构在地震作用下的抗倒塌能力。地震作用下,防屈曲支撑钢框架结构各构件参与抗震方式不同,防屈曲支撑通过轴向变形耗散地震能量,梁端通过弯曲变形耗散地震能量,框架柱通过适当变形保证结构不失稳倒塌。为此,针对防屈曲支撑钢框架整体结构提出基于构件损伤的易损性分析评价指标和方法。通过定义结构极限状态,对比基于不同评价指标的防屈曲支撑框架结构地震易损性分析结果。结果显示:基于单一评价指标的评价方法不能准确评价结构抗倒塌能力,防屈曲支撑钢框架结构虽然由于防屈曲支撑的优越变形能力使得结构耗能能力提升,但梁端仍可能发生破坏。Abstract: The contribution of structural members in structural seismic resistance is different. Traditional structural seismic indicators of vulnerability evaluation cannot reflect that characteristics, nor can it accurately and reasonably evaluate the collapse resistance of structures under earthquake action. Under the action of an earthquake, each member of buckling-restrained braces (BRB) steel frames participates in earthquake resistance in different ways. Buckling-restrained braces dissipate seismic energy through axial deformation, beam ends dissipate seismic energy through bending deformation, and frame columns ensure that structures do not collapse through appropriate deformation. The evaluation index and method of vulnerability analysis based on structure member damage for the overall structure of buckling-restrained braced steel frame were proposed. The structural limit state was defined, and the results for seismic vulnerability analysis of buckling-restrained braced steel frame based on different evaluation indicators were compared. The results showed that although buckling-restrained braced steel frames had improved energy-dissipating capacity of structures due to superior deformation capacity of buckling-restrained braces, damaged still occured at beam ends.
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Key words:
- BRB steel frame /
- member damage /
- evaluation index /
- collapse /
- vulnerability analysis
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李妍,吴斌,王倩颖,等.防屈曲钢支撑阻尼器的试验研究[J].土木工程学报,2006,39(7):9-14. 马宁,吴斌,赵俊贤,等. 十宇形内芯全钢防屈曲钢支撑抗震性能构件及子系统足尺试验[J].土木工程学报,2010,43(4):1-7. 吴克川,陶忠,潘文,等.不同刚度比下防屈曲支撑钢筋混凝土框架抗震性能试验研究[J/OL].[2020-07-11].建筑结构学报.https://doi.org/10.14006/j.jzjgxb.2020.0038. CHOI H,KIM J,CHUNG L. Seismic Design of Buckling Restrained Braced Frames Based on a Modified Energy-Balance Concept[J].Canadian Journal of Civil Engineering,2006,33(2):1251-1260. 吴志平,胡大柱,陈欣宇,等.钢棒防屈曲支撑受力性能研究[J].建筑结构学报,2020,41(3):163-171. FAJFAR P,VIDIC T. Consistent Inelastic Design Spectra:Hysteretic and Input Energy[J]. Earthquake Engineering and Structural Dynamics,1994,23(5):523-537. BERTERO V V,UANG C M. Issues and Future Directions in the Use of an Energy Approach for Seismic-Resistant Design of Structures[C]//Nonlinear Seismic Analysis and Design of Reinforced Concrete Buildings. London,Elsevier Applied Science:1992:95-104. 徐强,郑山锁,韩言召,等.基于结构整体损伤指标的钢框架地震易损性研究[J].振动与冲击,2014,33(11):78-82. YAO J T P,MUNSE W H. Low Cycle Axial Fatigue Behavior of Mild Steel[J]. Journal of Structural Division,1969,95(ST8):5-24. MIZUHATA K,GYOTEN Y,KITAMURA H. Study on Low Cycle Fatigue of a Structural Frame Due to Randomly Varying Load[C]//Proceedings of 6th World Conference on Earthquake Engineering. 1981:3031-3036. 贾明明,吕大刚,张辉.防屈曲支撑钢框架抗地震侧向倒塌能力分析[J].土木工程学报,2013,46(增刊1):7-12. 马宁,欧进萍,吴斌.基于能量平衡的梁柱刚接防屈曲支撑钢框架设计方法[J].建筑结构学报,2012,33(6):22-28. 任乐明,钟铁毅. 抗侧刚度比对防屈曲支撑钢框架结构地震响应和能量分配的影响[J]. 北京交通大学学报,2014,38(3):68-74. 徐强,马艳,王社良.基于构件损伤的BRB钢框架易损性分析[J].四川大学学报(工程科学版),2015,47(4):61-68. PARK Y J,ANG A H S, WEN Y K. Seismic Damage Analysis of Reinforced Concrete Buildings[J]. Journal of Structural Engineering,1985,111(4):740-757. KUMAR S, USAMI T. A Note on Evaluation of Damage in Steel Structures under Cyclic Loading[J]. JSCE Journal of Structural Engineering,1994,40:177-188. Federal Emergency Management Agency(FEMA). Prestandard and Commentary for the Seismic Rehabilitation of Buildings:FEMA 356[S]. Washington,D.C.:Federal Emergency Management Agency,2000. AKBAS B. Energy-Based Earthquake Resistant Design of Steel Moment Resisting Frames[D]. Chicago:Department of Civil and Architectural Engineering,Illinois Institute of Technology,1997. LOCO N,CORNELL C A. Structure-Specific Scalar Intensity Measures for Near-Source and Ordinary Earthquake Ground Motions[J]. Earthquake Spectra,2007,23(2):357-392. FEMA. Quantification of Building Seismic Performance Factors:ATC-63 FEMA P-695[S]. Washington,D.C.:Federal Emergency Management Agency, 2009. 于晓辉,吕大刚.考虑结构不确定性的地震倒塌易损性分析[J].建筑结构学报,2012,33(10):8-14. 吕大刚,于晓辉,王光远.单地震动记录随机增量动力分析[J].工程力学,2010,27(增刊1):53-58. 王丹. 钢框架结构的地震易损性及概率风险分析[D]. 哈尔滨:哈尔滨工业大学,2006.
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