【作者】 彭斌；

【导师】 曹万林；

【作者基本信息】 北京工业大学 ， 土木工程， 2012， 博士

【摘要】 异形截面多腔钢管混凝土柱作为高层建筑关键竖向构件，已在部分工程中应用，并有较快发展的趋势。结合目前建设的超高层建筑工程实际，本文研究了异形截面多腔钢管混凝土巨型柱和乒乓球拍形截面多腔体钢管混凝土柱的抗震性能，并进一步研究了异形截面多腔钢管混凝土巨型柱框架结构的抗震性能，进行了较系统的试验研究和理论分析并给出了抗震设计建议。主要贡献如下：1.提出并研发了一种新型抗震构造的异形截面多腔钢管混凝土巨型柱。结合某超高层建筑工程实际，进行了12个1/25缩尺的六边形六腔体截面钢管混凝土巨型柱模型在不同水平力作用方向下的低周反复荷载抗震性能试验研究。基于试验，分析了其承载力、刚度及退化过程、延性、滞回性能、耗能和破坏机制。2.研发了一种乒乓球拍形截面多腔体钢管混凝土柱。结合某超高层建筑实际，进行了10个1/7缩尺模型的低周反复荷载下抗震性能试验研究。基于试验，分析了其承载力、刚度及退化过程、延性、耗能和破坏机制。3.研究并揭示了异形截面多腔体钢管混凝土巨型柱框架的屈服机制。结合某超高层建筑实际，进行了1个1/25缩尺的异形截面多腔体钢管混凝土巨型柱框架结构低周反复荷载下抗震性能试验研究。基于试验，分析了巨型框架的承载力、刚度及退化过程、延性、滞回特性、耗能能力和屈服机制，揭示了其抗震机理。4.给出了底部加强型多腔钢管混凝土巨型柱的抗震构造措施，提出了巨型框架结构抗震设计建议。进行了异形截面多腔钢管混凝土柱的非线性有限元分析，揭示了其损伤和屈服破坏过程。计算与实测结果符合较好。主要结论：1.异形截面多腔体钢管混凝土巨型柱有较好的弹塑性变形能力，其综合抗震性能良好，可满足工程抗震设计需要。2.提出的新构造措施巨型柱与普通构造巨型柱相比，承载力、延性、耗能能力均显著提高，刚度退化速度减慢，抗震性能显著提高。3.提出的乒乓球拍形截面多腔体钢管混凝土柱具有良好的弹塑性变形能力，其抗震性能良好，能够满足设计要求。4.异形截面多腔钢管混凝土巨型柱框架工作性能稳定，设计合理，具有“强柱、弱梁”的延性屈服机制，其抗震性能良好，可用于地震区超高层建筑结构抗震设计。更多还原

【Abstract】 As critical vertical member, the multi-cell CFST columns with special shaped sectionhave been applied in some projects, and it keeps a rapid development. Based on the realsuper high building projects, the seismic behavior of multi-cell CFST columns with specialshaped section and multi-cell CFST columns with table tennis racket section have beenstudied. Further more, the seismic behavior of mega-frame with multi-cell CFST columnshas been researched.The experiment research and theoryanalysis has been carried out，andthe seismic design suggestions has been given. The main contributions of the research areas follows:1. A multi-cell CFST mega-column with special shaped sectionwith new seismicstructural measure has been proposed. Based on a practical super high building project, theexperimental research on seismic behavior of121/25scaled specimens of multi-cell CFSTmega-columns with hexagon and six-cell section has been carried out under horizontal lowcyclic loading in different direction. The load-bearing capacity, stiffness and itsdegeneration, ductility, hystereticproperties, energy dissipation capacity, and failurecharacteristics ofspecimens have been analyzed based ontheabove experiments.2. A multi-cell CFST column with table tennis racket section has been researched.Based on a practical super high building project, the experimental research on seismicbehavior of101/7scaled multi-cell CFST mega-column specimens was carried out underhorizontal low cyclic loading. The load-bearing capacity, stiffness and its degeneration,ductility, energy dissipation capacity, and failure characteristic of specimens have beenanalyzed based onthe above experiments.3. The yield mechanism of mega-frame with multi-cell CFST column with specialshaped sectionwas researched and revealed. Based on the practical super high buildingproject, the experimental research on seismic behavior of a1/25scaled mega-frame withmega-columns was carried out under horizontal low cyclic loading. The load-bearingcapacity, stiffness and its degeneration, ductility, energy dissipation capacity, and failurecharacteristic ofspecimen have been analyzed based on the above experiment.4. The seismic constructional measures of multi-cell CFST mega-columnsstrengthened at the bottom were suggested. And the seismic design suggestions ofmega-frame structure were proposed. Nonlinear finite element analysis on multi-cell CFSTmega-column with special shaped section was carried out, the damage and yield failureprocesswasrevealed as well. Calculated results coincide wellwiththe measured values.Main conclusions are asfollows:1. The multi-cell CFST mega-column with special shaped section has wellplastoelastic deformation capacity and good seismic behavior, the design requirements canbe fulfilled. 2. Compared with normal mega-columns, the load-bearing capacity, ductility, energydissipation capacity of the bottom strengthened mega-columns are greatly improved. Thespeed of their stiffness degeneration is slower, and the seismic behavior is significantlyimproved.3. The multi-cellCFST mega-column withtable tennis racket section has good seismicbehavior; and the design requirements can be fulfilled.4. The mega-frame with multi-cell CFST columns with special shaped section hasgood seismic behavior. It can be used in anti-seismatic design of super high buildings inseismic area.更多还原