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長周期超高層建筑最小底部剪力系數(shù)
扶長生,張小勇,周立浪
摘 要

 

(上海長福工程結構設計事務所, 上海 200031

摘要]推導了底部剪力系數(shù)Cs的通用表達式,繪制了Cs-T關系曲線,結果表明Cs隨基本周期變長而快速下降。不滿足最小底部剪力系數(shù)Cmins的需求并不意味結構方案和布置不合理。按當前的抗震理論,底部剪力是結構承受地震作用大小的宏觀指標。當結構的基本周期超過某一個臨界周期時,合理、簡單、有效的方法是按比例放大設計地震作用使CsCmins,而不是增大剛度、縮短周期。另外,筆者認為《建筑抗震設計規(guī)范》(GB 500112010)規(guī)定的Cmins限值是合理的,應予以執(zhí)行。然而,當使用基于性能的方法進行抗震設計時,可予以放松。

關鍵詞]長周期; 超高層建筑; 最小底部剪力系數(shù); 強度控制; 剛度控制

中圖分類號:TU398.2      文獻標識碼:A      文章編號:1002-848X(2014)10-0001-06

Minimum base shear coefficient for long period super high-rise buildings

Fu Changsheng, Zhang Xiaoyong, Zhou Lilang

 (Shanghai ChinaFu Structural Design Inc., Shanghai 200031, China)

Abstract: The general expression was given for the base shear coefficient Cs and Cs-T curves were also plotted. Results show that Cs will rapidly reduce with the longer period. It does not mean unreasonable structural design and layout that the calculated Csis less than the minimum base shear coefficient Cmins. The base shear is a comprehensive index of magnitude of the seismic force acting on the buildings based on the current seismic theory. For the case that the fundamental period of a structure is longer than one certain critical period, amplification of the input seismic action in scale may be reasonable, simple and effective method to meet the demand of CsCmins, instead of increasing the structural stiffness and shortening the period. Besides, the minimum limitation Cminsis reasonable for the base shear stipulated in Code for seismic design of buildings(GB 500112010), which should be implemented. However, if the performancebased method is used for the seismic design, the limitation could be relaxed.

Keywords: long period; super high-rise building; minimum base shear coefficient; strengthen control; stiffness control

作者簡介:扶長生,教授級高級工程師,Emailcfstruct@vip.sina.com。

參考文獻

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9]扶長生,周立浪,張小勇. 長周期超高層鋼筋混凝土建筑的P-Δ效應與穩(wěn)定設計[J. 建筑結構,2014,442):1-7.

10]扶長生,張小勇,周立浪. 長周期超高層建筑三維穩(wěn)定設計及其扭轉屈曲因子[J.建筑結構, 2014,443):1-6.

11]盧嘯,甄偉,陸新征,等. 最小地震剪力系數(shù)對超高層建筑結構抗震性能的影響[C//14屆高層建筑抗震技術交流會論文集.北海,2013275-282.

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