- 摘 要
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（上海長福工程結構設計事務所， 上海 200031）
［摘要］討論了長周期超高層鋼筋混凝土建筑的三維穩(wěn)定設計。以巨型框架-核心筒結構體系為背景，對15個案例進行彈性屈曲和地震反應分析。所有案例的扭轉屈曲均為第一扭轉模態(tài)，與收集到的8個工程實例的屈曲性能基本一致。彎矩作用平面內的P-Δ效應仍是重力二階效應的主要表現形式。但是，5%偶然偏心的計入對于偏心明顯的長周期超高層建筑而言，P-Δ,θ效應會進一步放大構件的變形，導致配筋的增加。典型工程實例的推覆分析表明，P-Δ,θ效應對結構整體的抗傾覆能力也許不會產生實質性的影響。另外，由于屈曲分析與自由振動分析微分方程的一致性，對于長周期超高層建筑，推薦使用扭轉屈曲因子λtcr替代周期比作為控制抗扭剛度的指標。
［關鍵詞］長周期; 超高層建筑; 三維穩(wěn)定設計; 巨型框架-核心筒結構; P-Δ效應; 扭彎屈曲; 扭轉屈曲因子
中圖分類號：TU973.1 文獻標識碼：A 文章編號：1002-848X(2014)03-0001-06
3D stability design and torsional buckling factor of long-period super high-rise buildings
Fu Changsheng, Zhang Xiaoyong, Zhou Lilang
(Shanghai ChinaFu Structural Design Inc., Shanghai 200031, China)
Abstract: 3D stability design of long-period super high-rise RC buildings was discussed. The elastic buckling and seismic responses of 15 cases were studied, the background of which is the long-period super high-rise RC buildings framed with the mega-columns and concrete core structure. The torsional buckling of all cases is the first buckling mode, which is the same as the buckling behaviour of 8 engineering projects collected. P-Δeffects in the moment acted plane remain to be primary in the second order theory. However, for the long-period super high-rise buildings with large eccentricity, the deformation of members would be amplified due to P-Δ,θ effects with 5% accidental eccentric distance, leading to increase the reinforcement contents. The performance of one typical illustration was estimated by the Pushover analysis, and the results show that P-Δ,θeffects may have not significant influences on the collapse capacity of the structure. Furthermore, depending on both differential equations of buckling and free vibration being mathematically equivalent, we strongly recommend that the reasonable torsional stiffness of the long-period super high-rise buildings would be measured by using the torsional buckling factor λtcr, replacing the period-ratio defined in the current China code.
Keywords: Long-period; super high-rise building; 3D stability design; mega-columns and concrete core structure; P-Δeffect; flexural-torsional buckling; torsional buckling factor
作者簡介：扶長生，教授級高級工程師，Email：cfstruct@vip.sina.com。
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