- 摘 要
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李 湛 （中國建筑科學(xué)研究院地基基礎(chǔ)研究所，北京100013）
[摘要] 采用三維有限元方法建立了雙塔樓大底盤高層建筑-厚筏基礎(chǔ)-地基相互作用體系的動力分析模型，通過同比例增減某一參數(shù)的取值，分析了結(jié)構(gòu)抗側(cè)剛度、混凝土強(qiáng)度、樓板厚度和地基土剛度對雙塔樓結(jié)構(gòu)振動特性和地震響應(yīng)的影響。結(jié)構(gòu)抗側(cè)剛度對結(jié)構(gòu)動力響應(yīng)的影響較大，地基土剛度和樓板厚度變化的影響次之。同時，通過與剛性基底假定的分析結(jié)果進(jìn)行對比可知，土-結(jié)構(gòu)之間的動力相互作用對結(jié)構(gòu)動力響應(yīng)的影響不容忽視。
[關(guān)鍵詞] 雙塔樓大底盤高層建筑；土-結(jié)構(gòu)動力相互作用；地震響應(yīng)；振動特性Dynamic interaction analysis of twin-towers high-rise bunding structure with enlarged base-foundation-soil system under earthquake
Li Zhan
( China Academy of Building Research, Institute of Foundation Engjneering, Beijing 100013, China)Abstract: The twin towers high-rise building structure with enlarged base-thick raft foundation-oil interaction system is modeled with 3D finite element model, with which the vibration characteristics and seismic responses of the system are analyzed. By regularly altering the parameters, such as lateral stiffness of the structure, thickness of floor plate and the stiffness of the soil, etc, the dynamic responses of the SSI system are calculated and compared with a symmetric twin towers higtrrise building structure. The results show that the lateral stiffness of the structure has more remarkable idluences on dynamic responses of the structure than the other parameters. At the same time, by comparing the results with that achieved from the rigid base supposition, it shows that the SSI can remarkably idluence the dynamic responses of the structures and can not be overlooked.
Keywords: twin-towers high-rise structures with enlarged base; soil structure dynamic interaction; seismic dynamic responses; vibration characteristics
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