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时间:2017-12-08
《桩-液化土相互作用p-y关系分析》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、万方数据第28卷第3期2008年6月地震工程与工程振动JOURNALOFEARTHQUAKEENGINEERINGANDENGINEERINGVIBRATIONV01.28No.3Jun.2008文章编号:1000—1301(2008)03·0165—07桩一液化土相互作用P—Y关系分析李雨润1,袁晓铭2,梁艳3,孙锐2(1.河北工业大学土木工程学院,天津300130;2.中国地震局T程力学研究所。黑龙江哈尔滨150080;3.天怡建筑设计有限公司,天津300051)摘要:基于多工况的桩一液化土体动力相互作用振动台试验,研究地震荷载作用下液化土层中桩土间侧向相互作用力p与桩身和土体问侧
2、向相对位移Y之间的关系。将试验得到的实际p-y曲线与采用拟静力法和以API规范为基础的折减系数法计算出的p-y曲线进行对比,结果表明:(1)液化土层中试验得到的桩真实p7响应及由拟静力法和折减系数法得到的结果都呈非线性变化,三者极限状态有接近一致的趋势,但变化过程差异明显;(2)采用拟静力法和折减系数法都会使液化土层桩基础侧向反力迅速增长,很快达到屈服极限,远远超过实际情况,会导致相当保守的结果;(3)液化进程中控制桩P—Y响应的是土体位移而非惯性力,肉而拟静力法和折减系数法的原理不适合桩.液化土体动力相互作用分析,不能用于液化土层中桩基础地震响应的计算。关键词:振动台试验;桩-液化土
3、相互作用;p一),曲线;折减系数法;拟静力法中国分类号:P315.9文献标志码:AAnalysisforp-ycurvesofliquefiedsoil-pileinteractionLIYurunl,YUANXiaomin92,LIANGYan3,SUNRui2(1.CollegeofCivilEngin∞ring,HebeiUniversityofTechnology,Tianjin300130,China;2.InstituteofEngineeringMechanics,ChinaEarthquakeAdministration,Harbin150080,China;3.Tia
4、nyiConstructionDesignCorporation,Tianjin300051,China)Abstract:Intermsofthedynamicinteractionbetweenthepilefoundationandtheliquefiedsoillayerbasedonsha-kingtabletests,therelationshipoftheinteractionlateralforcePbetweenthepileandthesurroundingsoillayerwiththerelativelateraldisplacementsYbetweenthe
5、pileandsurroundingsoillayerisinvestigated.Comparisonoftheactualbehaviorresultingfromthetestesandthosefromthepseudo·-staticmethodandrigidity—-reductionmethodindicatesthatthedynamicP一,,curvesfromthetestsandfromthepseudo—staticandrigidity—reductionmethodsshownearlysamelimitstatebuttheprocessesarequ
6、itedifferent.Thelateralinteractionforceintheliquefiedsoillayerbythepseudo·staticandtherigidity—reductionmethodsrapidlyincreasesandreachestheyieldstate.’Thisisobvi-ouslylargerthantheactualsituationandleadstoquiteconservativeresults.Thedominantfactorintheliquefiedsoillayerissoildisplacementrathert
7、hantheinertiaforceofthesuperstructureandthepseudo.-staticandtherigidi.-ty—reductionmethodsarenotsuitableforsimulatingtheresponseofpilefoundationontheliquefiablesoillayers.Keywords:shakingtabletest;liquefiedsoil·-pileinteract
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