巨型混合框架-核心筒结构的性能分析
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摘要
巨型混合框架-核心筒结构是由巨型型钢混凝土框架、混凝土核心筒与伸臂桁架组成的一种具有多道抗震防线的超高层结构体系。为了有效地提高巨型混合框架-核心筒结构的抗侧刚度和内外筒之间的协同工作性能,可采取以下措施:增加巨型梁的刚度;增加伸臂桁架的刚度;增设巨型支撑。分析结果表明:设置跨越两个楼层的巨型梁或伸臂,或增设巨型支撑,都可以提高结构抗侧刚度和缓解刚度突变,其中,增设巨型支撑的效果最明显。竖向荷载作用下,布置双层巨型梁或设置巨型支撑均可提高次结构到主结构的内力传递效率;布置双层伸臂可减小核心筒的轴力,提高核心筒的抗侧储备。水平地震作用下,巨型支撑直接提高外框架刚度,使框架底部剪力和弯矩都明显增大,框架容易满足"第二道防线"的要求。
Mega hybrid frame-corewall structure is a new type of structural system for super high-rise buildings,which consists of mega SRC frame,RC corewall,and outrigger trusses.The lateral stiffness and cooperative working performance of structure can be effectively improved by using methods as follows: increasing the stiffness of mega beams and outriggers,setting mega braces on the mega frame.The analysis results indicate that using these methods can improve the lateral stiffness and reduce the stiffness irregularity.The transmission efficiency of internal forces between the substructure and the main structure under vertical load can be improved by setting mega braces as well as increasing the stiffness of mega beams.The axial force of core wall can be reduced by increasing the stiffness of outrigger under vertical load,therefore,the earthquake-resistant capacity of core wall can be improved.The bottom shear force and moment of the mega frame under earthquake can be increased significantly by setting mega braces.
Mega hybrid frame-corewall structure is a new type of structural system for super high-rise buildings,which consists of mega SRC frame,RC corewall,and outrigger trusses.The lateral stiffness and cooperative working performance of structure can be effectively improved by using methods as follows: increasing the stiffness of mega beams and outriggers,setting mega braces on the mega frame.The analysis results indicate that using these methods can improve the lateral stiffness and reduce the stiffness irregularity.The transmission efficiency of internal forces between the substructure and the main structure under vertical load can be improved by setting mega braces as well as increasing the stiffness of mega beams.The axial force of core wall can be reduced by increasing the stiffness of outrigger under vertical load,therefore,the earthquake-resistant capacity of core wall can be improved.The bottom shear force and moment of the mega frame under earthquake can be increased significantly by setting mega braces.
引文
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[2]郝贵强,杜永山,齐建伟.钢筋混凝土超短柱与型钢混凝土超短柱滞回性能试验研究[J].工业建筑,2008,38(10):33-37.
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[4]辛建雨.巨型框架结构体系的动力特性及地震响应分析[J].工业建筑,2008,38(增刊):443-446.
[5]陈麟,张耀春.巨型结构体系及发展趋势[J].哈尔滨工业大学学报,2003,23(11):1307-1310.
[6]广州容柏生建筑工程设计事务所.珠江新城J2-2地块商务综合楼建筑结构超限设计可行性报告[R].广州:广州容柏生建筑工程设计事务所,2010.
[7]天津海泰新星房地产开发有限公司.天津117大厦结构设计研讨报告[R].广州:天津海泰新星房地产开发有限公司,2009.
[8]陈林之,吕西林.带加强层框架-核心筒结构的静力弹塑性分析[J].结构工程师,2007,23(4):18-23.
[9]聂建国,田淑明,矫金广.框架-核心筒组合结构体系在选型中的刚度规律[J].建筑科学与工程学报,2008,25(1):10-17.
[10]JGJ 3—2002高层建筑混凝土结构技术规程[S].
[11]叶列平,方鄂华.钢骨混凝土构件受力性能研究综述[J].土木工程学报,2000,33(5):1-12.
[12]Goel S C.United States-Japan Cooperative Earthquake Eng-ineering Research Program on Composite and Hybrid Structures[J].Journal of Structural Engineering,ASCE,2004(2):157-158.
[13]Hiroshi N,Kazuhiro U.Finite Element Method Analysis of HybridStructural Frames with Reinforced Concrete Columns and SteelBeams[J].Journal of Structural Engineering,ASCE,2004(2):328-335.
[14]Deierlein G G,Hiroshi N.Over-View of U S-Japan Research onthe Seismic Design of Composite Reinforced Concrete and SteelMoment Frame Structures[J].Journal of Structural Engineering,ASCE,2004(2):361-367.
[15]白国良,楚留声,李晓文.高层框架-核心筒结构抗震防线问题研究[J].西安建筑科技大学学报:自然科学版,2007,39(4):445-450.
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