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(中國建筑科學(xué)研究院地基基礎(chǔ)研究所，北京 100013)

［摘要］考慮土-結(jié)構(gòu)動(dòng)力相互作用，建立了雙塔樓大底盤高層建筑動(dòng)力響應(yīng)分析的三維有限元模型，研究了筏板厚度變化對結(jié)構(gòu)振動(dòng)特性和地震響應(yīng)的影響。不同筏板厚度結(jié)構(gòu)動(dòng)力響應(yīng)的對比分析結(jié)果表明，隨著筏板厚度增加, 結(jié)構(gòu)主振周期呈減小趨勢，地震側(cè)移呈增加趨勢，地震剪力在塔樓部分呈增加趨勢但在地下室部分呈減小趨勢。筏板的動(dòng)撓度除在兩塔樓外側(cè)的邊跨范圍內(nèi)，一般隨板厚增加而減小，動(dòng)彎矩除靠近地下室外墻局部范圍內(nèi)，一般則隨板厚增加而增加?？梢姡ぐ搴穸炔⒎窃酱笤桨踩? 應(yīng)在滿足承載力和沖切等基本要求的前提下經(jīng)過優(yōu)選后確定

［關(guān)鍵詞］雙塔樓大底盤高層建筑；土-結(jié)構(gòu)動(dòng)力相互作用；厚筏基礎(chǔ)；振動(dòng)特性；地震響應(yīng)

Influence of raft thickness on earthquake response of twin\|towers highrise structure

 Li Zhan

 (China Academy of Building Research, Beijing 100013, China)

Abstract:The three dimensional FEM models are constructed to analyze the effects of raft thickness on the vibration characteristics and seismic responses of the twin-towers high-rise building structures with enlarged base, and the dynamic soil-structure interaction is incorporated in the analysis as well. The dynamic responses are obtained and compared for different raft thickness with a dual-axial symmetric twin-towers structure. It is shown that the predominant periods of the structure decrease, the seismic lateral displacements increase, and the seismic forces increase in the upper towers and decrease in the basements with increasing of the raft thickness. While in the raft, with increasing of raft thickness, the displacements decrease except in the outside frame of the towers  and the moments increase  except in the loxal adjacent to retailing wall of basement.It can be concluded that larger raft thickness cannot guarantee much more safety for the structures. So the raft should be designed with an optimized analysis on the precondition matching the bearing capacity and punching shear resistance.

Keywords:twin-towers high-rise structures with enlarged base; soil-structure dynamic interaction; thick raft foundation; vibration characteristics; seismic responses

*“十一五”國家科技支撐計(jì)劃重點(diǎn)項(xiàng)目(2006BAJ27B02)，中國建筑科學(xué)研究院科研項(xiàng)目(20071602330730008)。