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（奧雅納工程咨詢（上海）有限公司， 上海 200092）

［摘要］計(jì)算了6個(gè)不同高度和不同結(jié)構(gòu)體系的超高層建筑模型的豎向自振周期和豎向地震響應(yīng)；分析了超高層建筑豎向構(gòu)件和水平構(gòu)件的豎向地震動(dòng)響應(yīng)特征。研究發(fā)現(xiàn)，超高層建筑水平自振周期遠(yuǎn)大于場(chǎng)地特征周期，而豎向自振周期則與場(chǎng)地特征周期接近，豎向振動(dòng)響應(yīng)得到放大。根據(jù)設(shè)計(jì)反應(yīng)譜，對(duì)于各種抗震設(shè)防烈度，結(jié)構(gòu)總豎向地震作用標(biāo)準(zhǔn)值FEvk都至少是結(jié)構(gòu)總水平地震作用標(biāo)準(zhǔn)值FEk的2-44倍。進(jìn)而提出描述超高層建筑受到豎向地震全過(guò)程的4個(gè)概化模型，并指出規(guī)范簡(jiǎn)化算法的局限性。提出豎向地震作用對(duì)P-Δ效應(yīng)與P-δ效應(yīng)的放大主要體現(xiàn)在P值增大，使得“重力二階效應(yīng)”變成“重力與豎向地震響應(yīng)共同作用下的二階效應(yīng)”。采用時(shí)程分析法研究了水平構(gòu)件振動(dòng)加速度響應(yīng)，提出二次振動(dòng)和豎向構(gòu)件錯(cuò)動(dòng)對(duì)水平構(gòu)件振動(dòng)響應(yīng)有顯著影響。分析了采用振型分解法計(jì)算超高層建筑豎向地震響應(yīng)時(shí)質(zhì)量參與系數(shù)偏低的原因，并指出當(dāng)結(jié)構(gòu)高度超過(guò)某一數(shù)值時(shí)，豎向地震作用下的結(jié)構(gòu)第一階振型會(huì)從豎向振動(dòng)轉(zhuǎn)變?yōu)樗綌[動(dòng)。

［關(guān)鍵詞］豎向地震； 豎向自振周期； 重力二階效應(yīng)； 二次振動(dòng)； 樓板振動(dòng)； 質(zhì)量參與系數(shù)

中圖分類號(hào)：TU318-1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)22-0034-05

Characteristics and countermeasures of vertical seismic response for super high-rise buildings

Wang Mingmin, Wang Yuan, Zhu Ligang, Wang Yang

(ARUP, Shanghai 200092, China)

Abstract:The vertical natural period and the vertical seismic response of models of six super high-rise buildings with different heights and structural systems were calculated; the vertical ground motion response characteristics of vertical members and horizontal members of super high-rise buildings were analyzed. The study shows that the horizontal self-vibration period of super high-rise buildings is much larger than the site characteristic period, while the vertical natural period is close to the site characteristic period, so the vertical vibration response is amplified. According to the design response spectrum, for all kinds of seismic fortification intensity, the standard value of vertical seismic action FEvk is at least 2-44 times of the structural total horizontal seismic action value FEk. Furthermore, four generalized models describing the whole process of super-high-rise buildings subjected to vertical earthquakes were proposed, and the limitations of the simplification method in Chinese code were pointed out. It is proposed that the vertical seismic action amplifies the P-Δ effect and the P-δ effect mainly due to the increase of the P value, so that the “gravity second-order effect” becomes the “second-order effect under the joint action of gravity and vertical seismic response”. The time-history analysis method was used to study the vibration acceleration response of horizontal members. It proposed that the secondary vibration and different displacement of vertical components have a significant influence on the vibration response of horizontal members. The reason why the mass participation coefficient is low when calculating the vertical seismic response of super high-rise buildings by vibration mode decomposition method was analyzed. It pointed out that when the height of the structure exceeded a certain value, the first mode shape of the structure under vertical earthquake would turn from vertical vibration to horizontal swing.

Keywords:vertical earthquake vibration; vertical natural period; gravity second-order effect; secondary vibration; floor vibration; mass participation coefficient

作者簡(jiǎn)介：王明珉，博士，高級(jí)工程師，注冊(cè)土木工程師（巖土），Email:cquwmm@163.com。