桩筏连接形式及垂直度对桩身应力的影响分析

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1、74江苏建筑2015年第5期（总第171期）桩筏连接形式及垂直度对桩身应力的影响分析成建阳，周峰（南京工业大学交通学院，江苏南京210009）[摘要]常规桩基、复合桩基和刚性桩复合地基中桩-筏连接形式的不同和桩身的垂直度对桩身内力有显著影响，现有规范和计算方法对此仅作定性描述，没有定量分析，给设计和计算带来困难。文章通过具体算例，针对同一工况，分别按照常规桩基、复合桩基和刚性桩复合地基进行设计，基于“m”法计算出上述3种情况下的桩身应力并进行了对比，同时按规范允许偏差范围，计算了垂直度对桩身内力

2、的影响。结果表明，如仅考虑水平荷载，常规桩基和复合桩基在桩顶1/4范围内产生较大弯矩，而刚性桩复合地基中的桩身内力则远小于前两者，如考虑桩身在规范允许的垂直度范围，刚性桩复合地基中的桩身内力迅速增大，数值接近常规桩基和复合桩基。建议在桩身1/4范围内应加强配筋，刚性桩复合地基在该范围内不宜选用素混凝土桩，该范围外的其它部位可适当降低要求。[关键词]连接形式；桩身应力；垂直度；复合地基；复合桩基[中图分类号]TU473[文献标识码]A[文章编号]1005-6270（2015）05-0074-04T

3、heInfluenceAnalysisoftheConnectionFormofPile-RaftandVerticalDegreeonPileStressCHENGJian-yangZHOUFeng(TransportationCollegeofNanjingTechUniversity，NanjingJiangsu210009China)Abstract：Thedifferentpile-raftconnectionformsofordinarypilefoundation,composit

4、epilefounfation,rigidpilecompositefoundationandtheverticaldegreeofthepilebodyhaveagreatinfluenceontheinternalforceofpile.Theexistingspecificationsandthecalculationmethodonlymakethedescriptionofdeterminingthenature,withoutquantitativeanalysisandgivent

5、hedifficultiestothedesignandcalculation.Thepaperanalysestheeffectofdifferentconnectionformsofpile-raftonpilestressunderthesamecondition,respectivedesignedbyordinarypilefoundation,compositepilefoundation,rigidpilecompositefoundationandobtaineachformof

6、pilestressbymmethod.Alsocalculatingtheinfluenceoftheverticaldegreeaccordingtotheallowabledeviationoftheexistingspecifications.Theresultshowedthat,ifonlythehorizontalloadinconsidered,theordinarypilefoundationandcompositepilefounfationhavealargemomento

7、ntheonequarterofthepiletopandtherigidpilecompositefoundationisfarlessthanthetwoformer.Iftheallowabledeviationoftheexistingspecificationsareinconsidered,thepilestressofrigidpilecompositefoundationhaveincreasedalotandclosetothetwoformerinnumerical.Ther

8、ageoftheonequarterofthepiletopshouldstrengththereinforcement,theplainconcretepileinrefuseintherigidpilecompositefoundation,theotherplacecandecreaserequirement.Keywords：connectionform;pilestress;verticaldegree;compositeground;compositepilefoundation桩的