大位移往复加载下钢框架节点地震损伤试验研究
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摘要
结构临近倒塌状态时,构件不可避免发生较大变形。节点区梁柱焊接处是钢框架结构薄弱环节,易发生脆性破坏,本文设计了3个不同的大位移加载制度对钢框架节点构件进行低周往复加载,考察其破坏过程与特征,研究了不同大位移加载方式对钢框架节点的荷载-位移滞回曲线、滞回耗能、损伤演化等力学性能的影响。结果表明:加载制度对构件的破坏形态起控制作用,变幅加载与等幅60 mm循环加载下试件为脆性破坏,等幅90 mm循环加载下试件为延性破坏。钢框架节点梁端作为结构抗震耗能的关键部位,将耗能能力作为评价其抗震性能的指标,建立起简单通用的累积破坏损伤模型,该损伤模型易于评价节点在地震作用下的损伤程度。
When a structure is close to collapse state,its structural members inevitably exhibit large deformation. In a steel frame structure,the welding of beam and column in the joint area is the weak link that is prone to brittle failure. In this study,three different large displacement loading systems are designed for low-cycle reciprocating loading of steel frame joints,and the failure process and characteristics are investigated. The effects of different large displacement loading methods on the load-displacement hysteresis curve,hysteretic energy dissipation,damage evolution,and other mechanical properties of steel frame joints are studied. Results show that the loading system plays a controlling role in the failure modes of the members. The specimen under variable amplitude loading and equal amplitude 60 mm cyclic loading shows brittle failure,while the specimen under equal amplitude 90 mm cyclic loading shows ductile failure. The energy dissipation capacity was taken as the index to evaluate the seismic performance of the joints,the beam end of which was the key part of seismic energy dissipation of the structure. A simple and general cumulative damage model was established,which was easy to evaluate the damage degree of the joints under earthquake.
When a structure is close to collapse state,its structural members inevitably exhibit large deformation. In a steel frame structure,the welding of beam and column in the joint area is the weak link that is prone to brittle failure. In this study,three different large displacement loading systems are designed for low-cycle reciprocating loading of steel frame joints,and the failure process and characteristics are investigated. The effects of different large displacement loading methods on the load-displacement hysteresis curve,hysteretic energy dissipation,damage evolution,and other mechanical properties of steel frame joints are studied. Results show that the loading system plays a controlling role in the failure modes of the members. The specimen under variable amplitude loading and equal amplitude 60 mm cyclic loading shows brittle failure,while the specimen under equal amplitude 90 mm cyclic loading shows ductile failure. The energy dissipation capacity was taken as the index to evaluate the seismic performance of the joints,the beam end of which was the key part of seismic energy dissipation of the structure. A simple and general cumulative damage model was established,which was easy to evaluate the damage degree of the joints under earthquake.
引文
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[3]郑山锁,王晓飞,孙龙飞,等.酸性大气环境下多龄期钢框架节点抗震性能试验研究[J].建筑结构学报,2015,36(10):20-28.ZHENG Shansuo,WANG Xiaofei,SUN Longfei,et al. Experimental research on seismic behavior of multi-aged steel frame joint under acidic atmospheric environment[J].Journal of building structures,2015,36(10):20-28.
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[8]王萌,石永久,施刚,等.高层钢框架构件与节点滞回模型及损伤退化分析[J].工业建筑,2009(S1):973-981.WANG Meng,SHI Yongjiu,SHI Gang,et al. Analysis on degraded and damage hysteretic model of high-rise steel frame structures and connections[J]. Industrial construction,2009(S1):973-981.
[9]北京钢铁设计研究总院,重庆大学,西安建筑科技大学,等. GB 50017-2003,钢结构设计规范[S].北京:中国计划出版社,2003.Beijing Iron and Steel Design and Research Institute,Chongqing University,Xi`an University of Architecture and Technology. GB 50017-2003,Code for design of steel structures[S]. Beijing:China Planning Press,2003.
[10]AKBAS B. Energy-based earthquake resistant design of steel moment resisting frames[D]. Chicago,USA:Illinois Institute of Technology,1997.
[11]BOJ ORQUEZ E,REYES-SALAZAR A,TERAN-GILMORE A,et al. Energy-based damage index for steel structures[J]. Steel and composite structures,2010,10(4):343-360.
[12]徐强,郑山锁,程洋,等.基于结构损伤的在役钢框架地震易损性研究[J].振动与冲击,2015,34(6):162-167.XU Qiang,ZHENG Shansuo,CHENG Yang,et al. Based on the structural damage in service of steel framework seismic vulnerability research[J]. Journal of vibration and shock,2015,34(6):162-167.
[2]KRAWINKLER H,ZOHREI M. Cumulative damage in steel structures subjected to earthquake ground motions[J].Computers&structures,1983,16(1/2/3/4):531-541
[3]郑山锁,王晓飞,孙龙飞,等.酸性大气环境下多龄期钢框架节点抗震性能试验研究[J].建筑结构学报,2015,36(10):20-28.ZHENG Shansuo,WANG Xiaofei,SUN Longfei,et al. Experimental research on seismic behavior of multi-aged steel frame joint under acidic atmospheric environment[J].Journal of building structures,2015,36(10):20-28.
[4]国家自然科学基金委员会.学科发展战略研究报告一建筑、环境与土木工程II[R].北京:科学出版社,2006.National Natural Science Foundation Committee. Subject development strategy research report—Construction,environment and civil engineering II[R]. Beijing:Science Press,2006.
[5]中国建筑标准设计研究院. 01SG519,多、高层民用建筑钢结构节点构造详图[S].北京:中国建筑标准设计研究院,2004.China Institute of Building Stondard Design and Research.01SG519,Multistoriey and high-rise steel structune connection drawings[S]. Beijing:China Institute of Building Standard Design and Research,2004.
[6]Federal Emergency Management Agency(FEMA). FEMA356 Commentary on the guidelines for the seismic rehabilitation of buildings[S]. Washington,DC:Prepared by American Society of Civil Engineers,2000.
[7]熊俊.强震作用下钢框架焊接节点损伤性能和计算模型研究[D].北京:清华大学,2011.XIONG Jun. Research on the damage behavior and calculation model of welded connections in steel frames under earthquakes[D]. Beijing:Tsinghua University,2011.
[8]王萌,石永久,施刚,等.高层钢框架构件与节点滞回模型及损伤退化分析[J].工业建筑,2009(S1):973-981.WANG Meng,SHI Yongjiu,SHI Gang,et al. Analysis on degraded and damage hysteretic model of high-rise steel frame structures and connections[J]. Industrial construction,2009(S1):973-981.
[9]北京钢铁设计研究总院,重庆大学,西安建筑科技大学,等. GB 50017-2003,钢结构设计规范[S].北京:中国计划出版社,2003.Beijing Iron and Steel Design and Research Institute,Chongqing University,Xi`an University of Architecture and Technology. GB 50017-2003,Code for design of steel structures[S]. Beijing:China Planning Press,2003.
[10]AKBAS B. Energy-based earthquake resistant design of steel moment resisting frames[D]. Chicago,USA:Illinois Institute of Technology,1997.
[11]BOJ ORQUEZ E,REYES-SALAZAR A,TERAN-GILMORE A,et al. Energy-based damage index for steel structures[J]. Steel and composite structures,2010,10(4):343-360.
[12]徐强,郑山锁,程洋,等.基于结构损伤的在役钢框架地震易损性研究[J].振动与冲击,2015,34(6):162-167.XU Qiang,ZHENG Shansuo,CHENG Yang,et al. Based on the structural damage in service of steel framework seismic vulnerability research[J]. Journal of vibration and shock,2015,34(6):162-167.
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