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    蘇州混凝土水泥制品研究院有限公司

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    發布時間:2020-01-06 00:00:00
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    水泥混凝土制品

    管芯縱向裂縫對BCCP承載能力影響研究
    管芯縱向裂縫對BCCP承載能力影響研究
    • 孫岳陽1,胡少偉1,2,明 攀1,薛 翔2
    2020年第5期
    摘要
    引用本文
    摘? ?要:為了研究管芯縱向裂縫對BCCP(鋼筋纏繞鋼筒混凝土壓力管)承受內、外壓能力的影響,選取合適的材料本構模型,利用ABAQUS軟件建立了DN1 800 BCCP內、外壓計算模型,在內壓管的鋼筒外管芯和外壓管的管頂鋼筒內管芯處分別設置了1 000 mm、2 000 mm、3 000 mm、4 000 mm的縱向裂縫,將計算結果與完好管進行了對比。結果表明,對于內壓管,外管芯縱向裂縫僅對外管芯達到受拉極限所對應的內壓值產生影響,且該值與縱向裂縫長度無關,均在2.95 MPa左右,比完好管小0.25 MPa;對于外壓管,管頂內管芯縱向裂縫僅對裂縫所在位置處達到受拉極限所對應的外壓值產生影響,同樣與縱向裂縫長度無關,均在1 200 kN左右,比完好管小300 kN;無論是內壓管還是外壓管,保護層、鋼筒和鋼筋達到極限強度時所對應的荷載值都與管芯有無裂縫以及裂縫長度無關。 Abstract: In order to study the effect of longitudinal crack on the capacity of BCCP under internal or external pressure, the finite element software ABAQUS was used to establish two calculation models with the same diameter of 1 800 mm and appropriate material constitutions were selected. The longitudinal cracks of 1 000 mm,? 2 000 mm, 3 000 mm and 4 000 mm in length were arranged in the outer core of BCCP under internal pressure and in the top of the inner core under external pressure. The calculated results were compared with those of the intact pipe. The results show that for the pipe under internal pressure, the longitudinal crack of the outer core only affects the pressure corresponding to the tensile limit of the outer core, and this value is independent of the crack length, which is about 2.95 MPa, and is 0.25 MPa smaller than that of the intact pipe. For the pipe under external pressure, the longitudinal crack in the top of the inner core only affects the pressure corresponding to the tensile limit at the location of the crack, which is also independent of the crack length. The calculation results of loads are all around 1 200 kN, which is 300 kN smaller than that of the intact pipe. Whether BCCP is under internal or external pressure, the loads corresponding to the protective cover, cylinder and steel bar when they reach the ultimate strength are independent of the cracks in core and length of cracks.?
    孫岳陽,胡少偉,明攀,等.管芯縱向裂縫對BCCP承載能力影響研究[J].混凝土與水泥制品,2020(5):28-33. SUN Y Y, HU S W,MING P,et al.Study on the Effect of Longitudinal Crack in Core Pipe on the Bearing Capacity of BCCP[J].China Concrete and Cement Products,2020(5):28-33.
    復合應力下PVA-ECC受扭柱的抗震性能試驗研究
    復合應力下PVA-ECC受扭柱的抗震性能試驗研究
    • 梁 肖1,邵永健1,凌 智1,王國佐2
    2020年第5期
    摘要
    引用本文
    摘?要:通過6根鋼筋加強ECC柱和1根普通混凝土柱在壓-彎-剪-扭復合應力狀態下抗震性能試驗,研究了構件的滯回曲線、骨架曲線、強度退化、剛度退化以及破壞形態,分析了配箍率、縱筋配筋率、纖維摻量對ECC受扭柱抗震性能的影響。試驗結果表明,較普通RC柱,ECC柱的滯回曲線更加飽滿,屈服扭矩、極限扭矩以及極限扭率分別提高了64.4%、74.8%、123.3%;試件的纖維摻量從1%提高到2%,延性系數從2.30增至4.04;隨著配箍率增大,試件受扭性能增強,較于未配置箍筋的試件,箍筋間距為75mm的試件延性系數提高了66.2%,極限扭矩提高了34.0%。Abstract:Basedontheseismicperformancetestof6ECCcolumnsstrengthenedwithsteelbarsandoneordinaryconcretecolumnundertheconditionofcompressionbendingsheartorsioncompositestress,thehystereticcurve,skeletoncurve,strengthdegradation,stiffnessdegradationandfailuremodeofthecomponentwerestudied,andtheinfluenceofstirrupratio,longitudinalreinforcementratioandfibercontentontheseismicperformanceofECCcolumnssubjectedtotorsionwasanalyzed.TheresultsshowthatthehystereticcurveofECCcolumnisfullerthanthatofordinaryRCcolumn,andtheyieldtorque,ultimatetorqueandlimittorsionrateareincreasedby64.4%,74.8%and123.3%respectively.Thefibercontentincreasesfrom1%to2%,theductilitycoefficientincreasesfrom2.30to4.04.Withtheincreaseofstirrupratio,thetorsionalperformanceofspecimenisenhanced.Comparedwiththespecimenwithoutstirrup,theductilitycoefficientandultimatetorqueofspecimenwithstirrupspacingof75mmareincreasedby66.2%and34.0%respectively.
    梁肖,邵永健,凌,智,等.復合應力下PVA-ECC受扭柱的抗震性能試驗研究[J].混凝土與水泥制品,2020(5):34-37. LIANG X,SHAO Y J,LING Z,et al.Experimental Study on Seismic Behavior of PVA-ECC Columns under Composite Stress[J].China Concrete and Cement Products,2020(5):34-37.
    海洋腐蝕環境下鋼筋混凝土梁疲勞試驗研究
    海洋腐蝕環境下鋼筋混凝土梁疲勞試驗研究
    • 張秋悅1,王 暉1,韓文臣2
    2020年第5期
    摘要
    引用本文
    摘?要:對8根鋼筋混凝土梁進行了大氣環境、淡水及海水環境下的疲勞試驗,研究了其力學性能及剛度損傷演化規律。進一步分析了三種環境與循環荷載共同作用下試件梁的破壞形態、撓度發展規律和疲勞壽命。試驗結果表明,腐蝕和疲勞存在耦合作用,海水腐蝕環境與5%~70%荷載水平作用下,梁疲勞壽命最短。根據理論分析和試驗結果,對鋼筋混凝土梁在嚴酷海洋環境下的疲勞壽命及其規律進行了進一步研究,參考已有文獻和試驗研究結果給出了基于鋼筋混凝土梁剛度損傷演化規律的疲勞壽命預測模型,經計算,實測結果與該預測模型計算結果之間的誤差不超過13%。Abstract:Thefatiguetestsofeightreinforcedconcretebeamsunderatmospheric,freshwaterandseawaterconditionswerecarriedouttostudythemechanicalpropertiesandstiffnessdamageevolutionofreinforcedconcretebeams.Furtheranalyzethefailuremode,deflectiondevelopmentlawandfatiguelifeofthespecimenbeamundertheinteractionofthreeenvironmentsandcyclicloads.Thetestresultsshowthatthereiscouplingbetweencorrosionandfatigue.Undertheactionofseawatercorrosionenvironmentand5%~70%loadlevel,thefatiguelifeofthebeamistheshortest.Accordingtothetheoreticalanalysisandexperimentalresults,thefatiguelifeanditsregularityofreinforcedconcretebeamsunderseveremarineenvironmentarefurtherstudied.Referringtotheexistingliteratureandexperimentalresearchresults,thefatiguelifepredictionmodelbasedonthestiffnessdamageevolutionlawofreinforcedconcretebeamsisgiven.Aftercalculation,theerrorbetweenthemeasuredresultsandthecalculatedresultsofthepredictivemodeldoesnotexceed13%.
    張秋悅,王暉,韓文臣.海洋腐蝕環境下鋼筋混凝土梁疲勞試驗研究[J].混凝土與水泥制品,2020(5):38-41. ZHANG Q Y,WANG H, HAN W C.Experimental Study on Fatigue Behavior of Reinforced Concrete Beams under Marine Corrosion Environment[J].China Concrete and Cement Products,2020(5):38-41.
    Ⅲ型重載混凝土軌枕的設計與試驗研究
    Ⅲ型重載混凝土軌枕的設計與試驗研究
    • 鄭愛國
    2020年第5期
    摘要
    引用本文
    摘?要:由于重載列車速度的提高和運量的增加,軌道結構傷損破壞加速、線路設備病害發生和發展速度加快。目前,我國尚無27t及以上重載鐵路專用軌枕,為有效解決線路用枕需求,采用預應力混凝土軌枕設計方法,對設計荷載分析、結構型式尺寸及結構強度計算進行了設計,并完善了27t軸重重載軌枕的制造工藝,通過試驗和檢測,滿足重載軌枕的質量要求。Abstract:Theincreaseofspeedandtrafficvolumeofheavy-dutytrainmakesthedamageanddamageoftrackstructureaccelerate,andtheoccurrenceanddevelopmentspeedoflineequipmentdiseasesaccelerate.Therearenospecialsleepersfor27toraboveheavyhaulrailwayinChina.Inordertoeffectivelysolvethedemandofsleepersfortherailway,byusingthedesignmethodofprestressedconcretesleeper,thedesignloadanalysis,structuraltypesizeandstructuralstrengthcalculationaredesigned,andthemanufacturingprocessof27taxleloadheavy-dutysleeperisimproved.Thequalityofheavy-dutysleeperisensuredthroughnecessarytests.
    鄭愛國.Ⅲ型重載混凝土軌枕的設計與試驗研究[J].混凝土與水泥制品,2020(5):42-45. ZHENG A G.Design and Experimental Study of Type ⅢHeavy Haul Concrete Sleeper[J].China Concrete and Cement Products,2020(5):42-45.
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