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中粮前海总部大楼项目为复杂超高层结构,塔楼采用带1道伸臂桁架的钢管混凝土框架-钢筋混凝土核心筒结构。核心筒偏心布置,局部采用斜柱转换,高区采用张拉索幕墙结构附着在主体结构。介绍了偏筒结构设计的策略;对斜柱转换的特殊节点设计进行分析;对超大张拉索幕墙结构与主塔楼结构构件的节点进行了受力分析。结果表明,偏筒结构通过对核心筒采用不等墙厚设计可以有效地减少偏心,同时在核心筒墙内设置型钢可以有效抵抗核心筒偏置带来的拉力;合理设置桁架结构可以有效地抵抗拉索幕墙传递的扭矩和拉力;圆形柱和方形柱转换节点采用三道环板转换可以高效地实现节点力转换且方便施工。 相似文献
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在水平荷载起控制作用的超高层建筑中,设置伸臂桁架可以提高结构的整体工作性能,从而提高结构的抗侧刚度,控制结构的顶部位移,降低核心筒所承担的倾覆力矩。但是,伸臂桁架在施工阶段,由于内外筒施工不同步,结构布置不对等原因,会导致施工过程中内、外筒的变形存在一定差异,如果盲目施工,将会造成在伸臂桁架内部过早产生较大应力,导致结构成形后整体受力状况与原结构设计模型不符。通过研究,提出一种超高层伸臂桁架"延迟连接"的施工技术。该方法在沈阳恒隆广场主塔楼施工应用的情况表明,可有效解决外框与芯筒不均衡变形导致的伸臂桁架应力过大的问题,确保了伸臂桁架施工和使用阶段的结构性能。 相似文献
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超高层框架-核心筒结构体系中,伸臂桁架连接着外围巨柱框架与内部核心筒,需传递巨大内力,其连接构造、传力机制等非常复杂。以上海中心大厦工程为背景,选取钢骨混凝土巨柱-伸臂桁架-环带桁架连接区域和伸臂桁架-核心筒连接区域进行了单调静力加载试验,并进行了有限元分析和简化模型计算分析。结果表明:伸臂桁架能够有效连接相邻构件并可靠传力,其破坏模式表现为伸臂桁架斜腹杆的受压屈曲以及上、下弦杆的弯曲变形,具有较好的延性;伸臂桁架与巨柱和核心筒连接的节点板虽然部分区域进入塑性,但塑性变形不明显,表明连接区域的承载力远高于杆件的承载力;有限元分析及简化模型分析结果与试验结果吻合良好;简化模型反映了伸臂桁架的非线性受力机理,可对其失效荷载进行准确预测,并可根据结构性能设计要求进行伸臂桁架分析和构件截面选择。 相似文献
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基于巨型框架-核心筒结构体系中加强层伸臂桁架与巨型框架柱连接节点受力的特殊性,提出一种伸臂桁架-复式钢管高强混凝土柱的连接节点形式,运用ABAQUS软件并结合深圳某超高层结构设计,对该节点展开详细的数值模拟分析。研究揭示了该节点的受力机理,并证明其在传力上的可靠性,可为该类节点在超高层结构中的应用提供参考。 相似文献
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某61层框架—核心筒结构超高层建筑,主体结构形式为钢管混凝土框架—伸臂桁架—钢筋混凝土核心筒。研究了伸臂桁架、带状桁架与钢管混凝土框架柱连接节点的最不利工况,对其进行设计,并采用ANSYS分析了其受力特点,结果表明加强环对节点的约束效应明显,焊缝是控制节点强度的主要因素。 相似文献
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The damped outrigger system emerged as an improvement of the conventional outriggers with the aim to provide supplemental damping and to contribute to the vibration control in super tall buildings where this system is usually applied. In addition to viscous dampers (VDs), buckling‐restrained braces (BRBs) have also been employed as energy dissipating members in outriggers. Nevertheless, the combined use of outriggers with VDs and BRBs in the same structure has not yet been studied. Such combination can contribute to achieve an effective multiperformance design of super tall buildings. This paper presents a study whose main objective was to determine the optimal vertical combination of two types of energy dissipation outriggers to control the seismic responses of a 9‐zone super tall model structure. Outriggers with VDs (OVDs) and outriggers with BRBs (OBRBs) were placed at the different zones of the structure considering all the possible combinations and in configurations of up to four outriggers. The effects of these combinations on the seismic performance of the structure were studied through parametric analysis and optimization methods. This form of the outrigger system is defined in this paper as combined energy dissipation outrigger system. The results indicate that when two energy dissipation outriggers are used, the combination of OBRB plus OVD shows superior seismic performance compared with other double‐outrigger configurations. In addition, the results show that the locations of OVDs and OBRBs play an important role in the structure behavior; it was found that it is more beneficial to place OBRBs above OVDs. 相似文献
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北京雪莲大厦为地上部分36层,建筑总高度146.30m的高层建筑,结构具有以下特点:结构高度高,地震反应大,平面轮廓不规则,在纵横两个方向的框架不正交,不能形成有效的抗侧力体系。为解决这些问题,设计中采取了以下措施:采用由矩形钢管混凝土框架-钢筋混凝土核心筒组成的混合结构体系,并设了两个加强层,有效地加强了结构的刚度,采用矩形钢管混凝土框架则解决了框架不正交所带来的梁柱连接问题。介绍了该工程结构体系的选择,加强层的设计及型钢梁柱节点的处理等,工程实践表明:在高烈度区,带加强层的混合结构体系能够满足结构各项设计要求;矩形钢管混凝土柱可大大减少柱断面,也便于非正交框架体系中梁柱的连接。 相似文献
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Distribution of strong earthquake input energy in tall buildings equipped with damped outriggers
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M. Morales‐Beltran G. Turan U. Yildirim J. Paul 《The Structural Design of Tall and Special Buildings》2018,27(8)
The seismic design of optimal damped outrigger structures relies on the assumption that most of the input energy will be absorbed by the dampers, whilst the rest of the structure remains elastic. When subjected to strong earthquakes, nevertheless, the building structure may exhibit plastic hinges before the dampers begin to work. In order to determine to which extent the use of viscously damped outriggers would avoid damage, both the host structure's hysteretic behaviour and the dampers' performance need to be evaluated in parallel. This article provides a parametric study on the factors that influence the distribution of seismic energy in tall buildings equipped with damped outriggers: First, the influence of outrigger's location, damping coefficients, and rigidity ratios core‐to‐outrigger and core‐to‐column in the seismic performance of a 60‐story building with conventional and with damped outriggers is studied. In parallel, nonlinear behaviour of the outrigger with and without viscous dampers is examined under small, moderate, strong, and severe long‐period earthquakes to assess the hysteretic energy distribution through the core and outriggers. The results show that, as the ground motion becomes stronger, viscous dampers effectively reduce the potential of damage in the structure if compared to conventional outriggers. However, the use of dampers cannot entirely prevent damage under critical excitations. 相似文献