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（廣州容柏生建筑結(jié)構(gòu)設(shè)計(jì)事務(wù)所， 廣州  510170）

［摘要］基于某抗震設(shè)防烈度8度半?yún)^(qū)大底盤雙塔結(jié)構(gòu)，通過(guò)多種計(jì)算模型（整體、單塔、多塔切除純?nèi)狗?、切除大底盤以上塔樓、不同底盤相對(duì)高度）和計(jì)算方法（反應(yīng)譜、彈性時(shí)程、彈塑性時(shí)程），分析結(jié)構(gòu)周期、振型及振型質(zhì)量參與系數(shù)、層剪力、底盤相對(duì)高度、扭轉(zhuǎn)等因素的影響。研究表明：采用規(guī)范反應(yīng)譜法時(shí)，各階振型對(duì)不同結(jié)構(gòu)部位的激勵(lì)是大底盤結(jié)構(gòu)分析的關(guān)鍵。低階振型對(duì)大底盤的激勵(lì)不足，高階振型影響較大。因此地震作用下整體模型相對(duì)單塔模型的層剪力明顯增大；且大底盤不只是影響底部區(qū)域，而是放大了塔樓全高的層剪力，樓層越高放大系數(shù)越大；在高烈度地震區(qū)，大底盤對(duì)結(jié)構(gòu)整體指標(biāo)及構(gòu)件設(shè)計(jì)均有顯著影響，大底盤樓板水平剪應(yīng)力的影響有可能超過(guò)正應(yīng)力。

［關(guān)鍵詞］高地震烈度區(qū)； 大底盤； 雙塔； 振型質(zhì)量參與系數(shù)； 底盤相對(duì)高度； 扭轉(zhuǎn)效應(yīng)

中圖分類號(hào)：TU318文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)04-0084-05

Study on design of twin-tower structure with large chassis in high seismic fortification intensity region

Chen Xiaohang， Zhou Ding， Chen Yin， Zhao Qing， Liu Juan

（RBS Architectural Engineering Design Associates, Guangzhou 510170, China）

Abstract:Based on a large chassis twin-tower structure in the region with 8 and half degree of seismic fortification intensity, various calculation models (whole model, single tower model, multi tower model without pure podium, model without tower above large chassis, and models with chassis of different relative heights) and calculation methods (response spectrum method, elastic time-history method, elastic-plastic time-history method) were used to analyze the impacts of structural period, vibration mode and mode mass participation coefficient, story shear force, chassis relative height, torsion and other factors. The results show that the key to the structural analysis of large chassis is the excitation of different modes to different parts of the structure with resporse spectrum method. The lower mode has insufficient excitation to the large chassis, and the higher mode has greater influence. Therefore, the story shear force of the whole model is significantly increased compared with that of the single tower model under the action of earthquake; and the large chassis not only affects the bottom area, but also enlarges the story shear force of the whole tower height, and the higher the floor is, the larger the amplification coefficient is; in the seismic fortification intensity region, the large chassis has a significant impact on the overall index of the structure and the design of the components, and the influence of the horizontal shear stress of the large chassis floor may exceed the normal stress.

Keywords:high seismic fortification intensity region; large chassis; twin-tower; mode mass participation coefficient; relative height of chassis; torsion effect

作者簡(jiǎn)介：陳曉航，高級(jí)工程師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email：chenxiaohang@gzrbs.com。