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（河南大學(xué)土木建筑學(xué)院， 開封 475001）
［摘要］建立超長樁四樁-承臺(tái)三維有限元模型，采用時(shí)程分析法研究了不同地震波作用下，超長樁基礎(chǔ)的抗震性能；根據(jù)相似理論，設(shè)計(jì)并制作幾何比例為1∶40的四樁-承臺(tái)超長樁基礎(chǔ)模型，埋入砂箱，進(jìn)行砂箱擬動(dòng)力試驗(yàn)，研究了地震作用下樁體響應(yīng)規(guī)律，并對其在兩種方法下得出的結(jié)果進(jìn)行對比分析。結(jié)果表明：樁體的最大剪力均發(fā)生在樁頂，而最大彎矩則出現(xiàn)在樁頂附近處，樁端剪力和彎矩最小；地震波作用下樁身的剪力和彎矩最大值隨震級(jí)的增大而增大。超長樁基礎(chǔ)承臺(tái)和樁頂緊剛性連接形成整體，有利于抵抗地震作用，同時(shí)樁周土體產(chǎn)生的側(cè)摩阻力也對樁身的受力及變形發(fā)揮一定阻止作用，通過觀察試驗(yàn)現(xiàn)象、分析試驗(yàn)和理論數(shù)據(jù)可見超長樁基礎(chǔ)具有良好的抗震性能。
［關(guān)鍵詞］超長樁基礎(chǔ)； 有限元； 時(shí)程分析； 擬動(dòng)力試驗(yàn)； 地震響應(yīng)
中圖分類號(hào)： TU473.1 文獻(xiàn)標(biāo)識(shí)碼： A 文章編號(hào)： 1002-848X(2015)S2-0232-03
Research on seismic performance of super long pile foundation
Bao Peng, Han Xuehang, Wang Meng, Gui Song, Geng Zhaohui
(School of Civil Engineering and Architecture, Henan University, Kaifeng 475001, China)
Abstract: A super long four-pile-caps three dimensional finite element model was built by time history analysis method to study seismic performances of the long pile foundation under different seismic waves. According to the similarity theory, four-super long pile-caps pile foundation model of geometric proportion of 1∶40 was designed and made, then it was buried in sand box for sand box pseudo-dynamic test to study the response of piles under earthquake and make comparative analysis of their results of the two methods. The results show that all maximum shears occur on the top of the pile, while the maximum bending moment occurs near the top of the pile and the minimum shear and moment occurs on the tip of pile. Maximum shear and moment of pile increases with the increasing magnitude under the seismic waves. The pile caps of the super long pile foundation tightly connect to the pile top, conducive to resisting earthquakes, while the lateral friction generated by the soil around pile also prevent the stress and deformation of the pile. Through observing the trial, analyzing the experimental and theoretical data, it shows that super long pile foundation has a good seismic performance.
Keywords: super long pile foundation; finite element; time history analysis; pseudo-dynamic testing; seismic response
作者簡介：鮑鵬，博士，教授，Email:cnbaop@aliyun.com。
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