資源描述:
《堆載作用下橋梁被動樁偏移受力分析及處理措施.pdf》由會員上傳分享,免費在線閱讀,更多相關內容在行業(yè)資料-天天文庫。
1、橋梁建設2014年第44卷第4期(總第227期)22BridgeConstruction,Vo1.44,No.4,2014(TotallyNo.227)文章編號:1003—4722(2014)04—0022—05堆載作用下橋梁被動樁偏移受力分析及處理措施馬遠剛,王艷芬,陳晨。(1.中鐵大橋局集團橋科院有限公司,湖北武漢430034;2.武漢理工大學,湖北武漢430063)摘要:為研究堆載對橋梁被動樁的影響,以某橋為背景,采用有限差分法進行被動樁偏移受力分析,判斷基樁能否繼續(xù)使用并提出處理措施。采用有限差分法建立
2、下部結構模型,計算堆載作用下橋墩偏移并與實測值對比,分析基樁內力及偏移,按圓形截面鋼筋混凝土偏心受壓構件計算最大裂縫寬度并評估基樁狀態(tài),根據評估結果提出處理措施。結果表明:堆栽導致橋墩偏移,墩頂橫向偏移計算值與實測值比較吻合;堆載作用下,基樁產生了較大偏移和彎矩,樁頂軸力和樁身軸力分布不均,并產生不同程度的負摩阻力(距堆載越近負摩阻力越大);最大裂縫寬度為0.08mm,小于規(guī)范限值,判斷基樁可以繼續(xù)使用,提出堆載反壓和應力釋放孔聯(lián)合糾偏,開挖卸載、水平頂推結合應力釋放孔糾偏等處理措施。關鍵詞:橋梁基礎;被動樁;
3、堆載;位移;軸力;負摩阻力;裂縫寬度;糾偏;有限差分法中圖分類號:U443.15文獻標志碼:AForceAnalysisandHandlingMeasuresforOffsettingofBridgePassivePilesUnderActionofStackedLoadMAYuan-gang,WANGYan—fen,CHENChen。(1.BridgeScienceResearchInstituteLtd.。ChinaRailwayMajorBridgeEngineeringGroup,Wuhan430034
4、,China;2.WuhanUniversityofTechnology,Wuhan430063,China)Abstract:Tostudytheinfluencesofstackedloadonthebridgepassivepiles,abridgewastakenastheresearchobject,theforceanalysisofoffsettingofthepassivepileswasconductedbythefinitedifferencemethod,thepileswerejudge
5、diftheycouldbecontinuouslyusedandthecor—respondinghandlingmeasureswereproposed.Themodelsforthesubstructureofthebridgeweresetupalsobythefinitedifferencemethod,theoffsettingofthepiersofthebridgeundertheac—tionofthestackedloadwascalculatedandthecalculatedvalues
6、werecomparedtothemeasuredones.Theinternalforcesandoffsettingofthepileswereanalyzed.Intermsofthecircularrein—forcedconcreteeccentriccompressioncomponents,themaximumcrackwidthofthepileswascal—culated,theforceconditionsofthepileswereassessedandbasedontheassessm
7、ent,thehandlingmeasureswereproposed.Theresultsshowthatthestacked1oadcausestheoffsettingofthepiersandthecalculatedandmeasuredvaluesofthelateraloffsettingofthepiertopsareaccordant.Un—dertheactionofthestackedload,thegreatoffsettingandbendingmomentoccurinthepile
8、s,theaxialforcedistributioninthepiletopsandpileshaftsisnotuniformandthenegativefrictionalre—sistanceofdifferentdegreesOCCURS(theclosertothestackedload,thegreaterthenegativefric—tionalresistancew