增设可更换冗余柱框架结构的抗震韧性研究  

Seismic resilience of RC frame structure with replaceable redundant columns

作　　者：王海东[1,2] 李昂[1] 彭麟燕 蒋德松 WANG Haidong;LI Ang;PENG Linyan;JIANG Desong(College of Civil Engineering,Hunan University,Changsha 410082,China;Key Laboratory of Building Safety and Energy Conservation,Ministry of Education,Hunan University,Changsha 410082,China;China Architecture Northwest Design and Research Institute Co.,Ltd.,Xi’an 710018,China;Hunan Huda Civil Construction Engineering Testing Co.,Ltd.,Changsha 410006,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]湖南大学建筑安全与节能教育部重点实验室,湖南长沙410082 [3]中国建筑西北设计研究院有限公司,陕西西安710018 [4]湖南湖大土木建筑工程检测有限公司,湖南长沙410006

出　　处：《铁道科学与工程学报》2023年第1期255-264,共10页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(52090084,52090082)。

摘　　要：随着建筑功能的日益复杂,仅考虑建筑结构本身的安全并不能保证社会秩序的正常运行,对于服役期间的重要建筑,结构在抵御灾害和灾后功能快速恢复的能力上应有更高的要求。为了有效提高相应建筑在地震作用中基本使用功能的完备和实现震后功能的快速恢复,基于建筑抗震韧性要求,提出一种增设可更换冗余柱的钢筋混凝土框架结构体系,并设计了一栋典型的10层钢筋混凝土框架结构,冗余柱柱端设计成为小震不坏、中震可修、大震成铰,即柱端钢筋变形达到设计值时,柱端连接失效,使得柱端部形成铰。采用OpenSees软件建立合适的本构模型,输入3条天然地震波,对普通和增设冗余柱的框架结构的抗震韧性进行对比研究。根据计算结果表明,设防烈度下,冗余柱分担了内力最大框架柱10%~23%的轴压比,使其轴力和剪力得到1%~23%的降低,达成“中震不坏”的目标;罕遇烈度下,通过控制冗余柱成铰的时刻,达成关键柱“大震可修”的目标;大震后,在冗余柱所在位置的两侧施加支撑,可快速更换已损坏的柱构件,实现结构的快速可恢复性。综上所述,增设冗余柱提高了结构抗震韧性,若将研究的成果用于高烈度区生命线工程,可以有效提高对应建筑结构的抗震韧性。该研究为建设韧性城市提供技术支持,为韧性评估提供理论支撑。With the increasing complexity of building functions, considering the safety of the building structure cannot guarantee the normal operation of social order. For important buildings during service, the structure should have higher requirements on the ability to resist disasters and quickly restore functions after disasters. In order to effectively improve the basic functions of the corresponding buildings during the earthquake and realize the rapid recovery of the post-earthquake functions, based on the requirements of building seismic toughness, a reinforced concrete frame structure system with replaceable redundant columns was proposed. Design a typical ten-story reinforced concrete frame structure. The replaceable redundant columns won’t be broken after small earthquakes,and they will be repaired after moderate earthquakes. The columns can even make their ends of rebar become articulated to be replaced after major earthquakes. Use OpenSees software to establish a suitable constitutive model, then input 3 natural seismic waves. Analyze the difference in seismic resilience between ordinary RC frame structure with or without replaceable redundant columns. The calculation result shows two aspects. First,under the fortification intensity, the redundant RC columns reduce 10%~23% of the axial compression ratio and 1%~23% of the internal force, so the frame structure won’t be broken after the moderate earthquake. Second,under the rare intensity, the frame structure will be repaired by controlling the moment when the redundant columns are hinged after the earthquake. After a major earthquake, adding supports on both sides of the redundant column position can quickly replace the damaged column members and achieve rapid recovery of the structure. In summary, the addition of redundant columns can improve the seismic resilience of the structure. If the research results are used in lifeline projects in high-intensity areas, the seismic resilience of corresponding building structures can be effectively improved. This res

关 键 词：抗震韧性 冗余柱 钢筋混凝土框架 可控性 可恢复性 

分 类 号：TU357.4[建筑科学—结构工程]