【摘要】：通過開展土-隔震結(jié)構(gòu)動力相互作用體系的大型振動臺模型對比試驗(yàn),研究了剛性地基、硬土地基和軟夾層地基3種不同地基上多層隔震結(jié)構(gòu)的地震反應(yīng)特征和基礎(chǔ)隔震效果。結(jié)果表明:SSI效應(yīng)對隔震結(jié)構(gòu)動力特性的影響與地基土性密切相關(guān),當(dāng)?shù)鼗列杂蓜傋內(nèi)釙r,隔震結(jié)構(gòu)體系的一階自振頻率明顯降低,阻尼比也明顯增大;不同土性地基上SSI效應(yīng)對隔震結(jié)構(gòu)地震反應(yīng)的影響并不相同,軟夾層地基上SSI效應(yīng)可能增大也可能減小隔震結(jié)構(gòu)的地震反應(yīng)強(qiáng)度,而硬土地基上考慮SSI效應(yīng)時隔震結(jié)構(gòu)的地震反應(yīng)與剛性地基時的地震反應(yīng)差別較小;不同土性地基上SSI效應(yīng)對隔震結(jié)構(gòu)基礎(chǔ)隔震效率的影響與地基土性、輸入地震動的特性和峰值等相關(guān),其中地基土性的影響最為明顯,地基土性越軟,基礎(chǔ)隔震效率越低。
[Abstract]:Through the comparative tests of large-scale shaking table models of soil-isolation structure dynamic interaction system, the seismic response characteristics and foundation isolation effect of multi-layer isolated structures on three different foundations, rigid foundation, hard soil foundation and soft sandwich foundation, are studied. The results show that the influence of SSI effect on the dynamic characteristics of isolated structures is closely related to the soil properties of the foundation. When the soil property of the foundation is changed from rigid to flexible, the first order natural vibration frequency of the isolated structure system is obviously reduced, and the damping ratio is obviously increased. The effects of SSI effect on seismic response of isolated structures on different soil foundations are different. The SSI effect on soft sandwich foundations may increase or decrease the seismic response intensity of isolated structures. The difference between seismic response of isolated structure and rigid foundation is small when SSI effect is considered on hard soil foundation, and the influence of SSI effect on isolation efficiency of isolation structure foundation and soil property of foundation on different soil foundation. The characteristic of the input ground motion is related to the peak value, among which the influence of the soil property of the foundation is the most obvious, and the softer the soil property of the foundation, the lower the isolation efficiency of the foundation is.
【作者單位】： 南京工程學(xué)院建筑工程學(xué)院;南京工業(yè)大學(xué)交通學(xué)院;保利江蘇房地產(chǎn)發(fā)展有限公司;
【基金】：江蘇省自然科學(xué)基金青年基金項(xiàng)目(BK2012477) 南京工程學(xué)院校級科研基金項(xiàng)目(CKJA201505)資助
【分類號】：TU311.3
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本文編號：2284282