加大截面法砼工程加固技術(shù)相關(guān)規(guī)定

加大截面法砼工程加固技術(shù)相關(guān)規(guī)定設(shè)計規(guī)定1本方法適用于鋼筋混凝土受彎和受壓構(gòu)件的加固。2采用本方法時，按現(xiàn)場檢測結(jié)果確定的原構(gòu)件混凝土強度等級應(yīng)不低于C10。3加固設(shè)計時，應(yīng)核算原構(gòu)件的應(yīng)力水平Bk:Bk=Sk/Rk式中:Sk——原構(gòu)件荷載效應(yīng)的標(biāo)準(zhǔn)值；Rk——原構(gòu)件抗力的標(biāo)準(zhǔn)值。若按上式算得的Bk值超出表1.3的限值，應(yīng)在加荷前進行卸荷。表3原構(gòu)件應(yīng)力水平限值應(yīng)力種類應(yīng)力水平Bk的限值軸心受壓、小偏心受壓、斜截面受剪0.80大偏心受壓0.904當(dāng)被加固構(gòu)件界面處理及其施工質(zhì)量符合本規(guī)范要求時，可按整體截面計算。5采用增大截面加固鋼筋混凝土結(jié)構(gòu)構(gòu)件時，其承載力的計算，除應(yīng)符合現(xiàn)行設(shè)計規(guī)范GB50010的基本假定外，尚應(yīng)符合本章節(jié)的補充規(guī)定和要求。受彎構(gòu)件正截面加固計算1采用增大截面加固受彎構(gòu)件時，應(yīng)根據(jù)原結(jié)構(gòu)構(gòu)造和受力的實際情況，選用在受壓區(qū)或受拉區(qū)增設(shè)現(xiàn)澆鋼筋混凝土外加層的加固方式。2當(dāng)僅在受壓區(qū)加固受彎構(gòu)件時，其承載力、抗裂度、鋼筋應(yīng)力、裂縫寬度及撓度的計算和驗算，可按現(xiàn)行設(shè)計規(guī)范GB50010關(guān)于疊合層即可滿足承載力的要求時，也應(yīng)按構(gòu)造要求配置受壓鋼筋和分布鋼筋。3當(dāng)在受拉區(qū)加固矩形截面受用彎構(gòu)件時，其正截面受彎承載力應(yīng)符合下列規(guī)定：⑴ (b> 偵圖2.3受彎構(gòu)件加固計算圖形ChapterIGeneralprovisionsarticleIobligationtoclearcreditpre-loaninvestigationrequirements,improvethequalityofpre-loaninvestigation,preventcreditrisks,accordingtotheCBRCcommercialbankcreditduediligenceguidelines,commercialbankcreditsmallbusinessduediligenceguidelines(trial)andotherregulatoryrequirementsandtheactualsituationoftheBank,thesemeasuresareformulated.Secondpersonmentionedinthesemeasuresreferstoinaccordancewiththerulesofcreditinvestigations,surveysandanalysisofthecreditbusinesspeople.ArticlecreditmentionedinthesemeasuresreferstotableprovidedtocustomersbothinsideandoutsideoftheBank'screditbusiness,includingforeigncurrencyloans,tradefinance,bankacceptances,commercialbilldiscounting,guarantees,factoring,credit,loancommitment,guaranteeandothercreditoperations,excludingclientcreditbusiness.Priortothechengdaiinvestigationintothefourtharticlethisreferstocreditbeforethereview,investigatorsbyobtaining,verification,analysisandsecurityaspectsofthesituation,evaluationandrevealsthepossiblecreditrisksandtoproposepreventivemeasures.Articlefifthduediligenceinthesemeasuresreferstothepersoninthepre-loaninvestigationproceduresfulfillingthemostbasicduediligencerequirements.Articlesixthofthemselves,pre-loaninvestigatorsrelativesorotherinterestedpersontoapplyforthecreditbusiness,oneshouldapplyforthewithdrawal.ChapterIIduediligenceduediligenceworkisthebasicrequirementoftheseventharticle:followtheprinciplesoftrue,complete,valid,anddiligenceduediligenceincarryingoutinvestigationduties.Investigatorsshouldbebasedonthecharacteristicsofdifferentvarietiesofcreditbusiness,creditMW冬/K〈如-當(dāng)力去義/如-號+汁杪孔砂-"} （方-1）出5心食乞 C2.3-3）式中:M——彎矩設(shè)計值（包括加固前的初始彎矩）;一鋼筋強度利用系數(shù);取=0.9;一新增鋼筋的抗拉強度設(shè)計值；一新增受拉鋼筋的截面面積；一構(gòu)件加固后和加固前的截面有效高度；x一等效矩形應(yīng)力圖形的混凝土受壓區(qū)高度，簡稱混凝土受壓區(qū)高度；也頂疽一原鋼筋的抗拉、抗壓強度設(shè)計值；一原受拉鋼筋和原受壓鋼筋的截面面積；I一縱向受壓鋼筋合力點至混凝土受壓區(qū)邊緣的距離；■一按受壓區(qū)混凝土矩形力圖的應(yīng)力與混凝土軸心抗壓強度設(shè)計值之比確定的系數(shù);當(dāng)混凝=1.0;當(dāng)混凝土強度等級為C80時，=0.94;其間按線性土強度等級不超過C50時，取內(nèi)插法確定；■一混凝土軸心抗壓強度設(shè)計值；b-矩形截面寬度；■一構(gòu)件增大截面加固后的相對界限受壓區(qū)高度系數(shù)，按本規(guī)范第2.4條的規(guī)定計算?！?受彎構(gòu)件增大截面加固后的相對界限受壓區(qū)高度系數(shù)值，應(yīng)按下列公式確定:"A-—"A-—-1+―5.圣(24-1)042)C24-3)式中：B1 計算系數(shù)，當(dāng)混凝土強度等級不超過C50時，B1值取為0.8;當(dāng)混凝土強度等級為C80時，B1值取為0.74，其間按線性內(nèi)插法確定；一混凝土極限壓應(yīng)變，取ecu=0.0033;%一新增鋼筋位置處，按平截面假設(shè)確定的初始應(yīng)變值；%一加固前受彎構(gòu)件驗算截面上原作用的彎矩標(biāo)準(zhǔn)值；ChapterIGeneralprovisionsarticleIobligationtoclearcreditpre-loaninvestigationrequirements,improvethequalityofpre-loaninvestigation,preventcreditrisks,accordingtotheCBRCcommercialbankcreditduediligenceguidelines,commercialbankcreditsmallbusinessduediligenceguidelines(trial)andotherregulatoryrequirementsandtheactualsituationoftheBank,thesemeasuresareformulated.Secondpersonmentionedinthesemeasuresreferstoinaccordancewiththerulesofcreditinvestigations,surveysandanalysisofthecreditbusinesspeople.ArticlecreditmentionedinthesemeasuresreferstotableprovidedtocustomersbothinsideandoutsideoftheBank'screditbusiness,includingforeigncurrencyloans,tradefinance,bankacceptances,commercialbilldiscounting,guarantees,factoring,credit,loancommitment,guaranteeandothercreditoperations,excludingclientcreditbusiness.Priortothechengdaiinvestigationintothefourtharticlethisreferstocreditbeforethereview,investigatorsbyobtaining,verification,analysisandsecurityaspectsofthesituation,evaluationandrevealsthepossiblecreditrisksandtoproposepreventivemeasures.Articlefifthduediligenceinthesemeasuresreferstothepersoninthepre-loaninvestigationproceduresfulfillingthemostbasicduediligencerequirements.Articlesixthofthemselves,pre-loaninvestigatorsrelativesorotherinterestedpersontoapplyforthecreditbusiness,oneshouldapplyforthewithdrawal.ChapterIIduediligenceduediligenceworkisthebasicrequirementoftheseventharticle:followtheprinciplesoftrue,complete,valid,anddiligenceduediligenceincarryingoutinvestigationduties.Investigatorsshouldbebasedonthecharacteristicsofdifferentvarietiesofcreditbusiness,credit一加固前，在初始彎矩Mok作用下原受拉鋼筋的應(yīng)變值。&%公當(dāng)增主筋與原主筋的連接采用短鋼筋焊接時，可取ho1=ho;此時：5當(dāng)按公式(2.3-1)及(2.3-2)算得的加固后混凝土受壓區(qū)高度x與加固前原截面有效高度ho1之比x/ho1大于原截面相對界限受壓區(qū)高度系數(shù)時，應(yīng)考慮原縱向受拉鋼筋應(yīng)力os。尚達不到的情況。為此，應(yīng)將上述兩公式中的改為oso，并重新進行驗算。驗算時，oso值按下式確定:若算得的oso<，則應(yīng)按此驗算結(jié)果確定加固鋼筋用量;若算得的結(jié)果Oso?則表示原結(jié)果無需變動。6對翼緣位于受壓區(qū)的T形截面受彎構(gòu)件，其受拉區(qū)增設(shè)現(xiàn)澆配筋混凝土層的正截面受彎承載力，應(yīng)按本規(guī)范第3條至第5條的計算原則和現(xiàn)行設(shè)計規(guī)定GB50010關(guān)于T形截面受彎承載力的規(guī)定進行計算。受彎構(gòu)件斜截面加固計算1受彎構(gòu)件加固后的斜截面應(yīng)符合下列條件當(dāng)hw/b?4時V?0.25(3.1-1)當(dāng)hw/b?6時V?0.20(3.1-2)當(dāng)4,hw/b,6時，按線性內(nèi)插法確定。式中:V——構(gòu)件加固剪力設(shè)計值；Bc——混凝土強度影響系數(shù);按現(xiàn)行設(shè)計規(guī)范GB50010的規(guī)定值采用；b——矩形截面的寬度或T形、I形的腹板寬度；hw——截面的腹板高度;對矩形截面，取有效高度:對T形截面，取有效高度減起翼緣高度;對I形截面，取腹板凈高。2采用增大截面法加固受彎構(gòu)件時，其斜截面受剪承載力應(yīng)符合下列規(guī)定：1當(dāng)受拉區(qū)增設(shè)配筋混凝土層，并采用U形箍與原箍筋逐個焊接時：dV<0.7XAmi弓岸凱-小苛為(321)2當(dāng)增設(shè)鋼筋混凝土三面圍套，并采用加錨式或膠錨式箍筋時：VQWM.+Sq"+1.溉，告知蒙知◎邊ChapterIGeneralprovisionsarticleIobligationtoclearcreditpre-loaninvestigationrequirements,improvethequalityofpre-loaninvestigation,preventcreditrisks,accordingtotheCBRCcommercialbankcreditduediligenceguidelines,commercialbankcreditsmallbusinessduediligenceguidelines(trial)andotherregulatoryrequirementsandtheactualsituationoftheBank,thesemeasuresareformulated.Secondpersonmentionedinthesemeasuresreferstoinaccordancewiththerulesofcreditinvestigations,surveysandanalysisofthecreditbusinesspeople.ArticlecreditmentionedinthesemeasuresreferstotableprovidedtocustomersbothinsideandoutsideoftheBank'screditbusiness,includingforeigncurrencyloans,tradefinance,bankacceptances,commercialbilldiscounting,guarantees,factoring,credit,loancommitment,guaranteeandothercreditoperations,excludingclientcreditbusiness.Priortothechengdaiinvestigationintothefourtharticlethisreferstocreditbeforethereview,investigatorsbyobtaining,verification,analysisandsecurityaspectsofthesituation,evaluationandrevealsthepossiblecreditrisksandtoproposepreventivemeasures.Articlefifthduediligenceinthesemeasuresreferstothepersoninthepre-loaninvestigationproceduresfulfillingthemostbasicduediligencerequirements.Articlesixthofthemselves,pre-loaninvestigatorsrelativesorotherinterestedpersontoapplyforthecreditbusiness,oneshouldapplyforthewithdrawal.ChapterIIduediligenceduediligenceworkisthebasicrequirementoftheseventharticle:followtheprinciplesoftrue,complete,valid,anddiligenceduediligenceincarryingoutinvestigationduties.Investigatorsshouldbebasedonthecharacteristicsofdifferentvarietiesofcreditbusiness,credit也■式中：一一新增混凝土強度利用系數(shù)，取值=0.7;c/■rto——新、舊混凝土軸心抗拉強度設(shè)計值；A——三面圍套新增混凝土截面面積；■a——新增箍筋強度利用系數(shù)，取值=0.9;s——新箍筋和原箍筋的抗拉強度設(shè)計值；嗪如地.——同一截面內(nèi)新箍筋各肢截面面積之和及原箍筋各肢截面面積之和；S或S——新增箍筋或原箍筋沿構(gòu)件長度方向的間距。o受壓構(gòu)件正截面加固計算1采用增大截面加固鋼筋混凝土軸心受壓構(gòu)件（圖4.1）時，其正截面受壓承載力應(yīng)符合下列規(guī)定：9"%中f庭Ia0此外￡&怎1）式中:N一構(gòu)件加固后的軸向壓力設(shè)計值；一構(gòu)件穩(wěn)定系數(shù)，根據(jù)加固后的截面尺寸，按表4.1的規(guī)定值采用；Aco和Ac—構(gòu)件加固前混凝土截面面積和加固后新增部分混凝土截面面積；一新增縱向鋼筋和原縱向鋼筋的抗壓強度設(shè)計值；-4j一新增縱向受壓鋼筋的截面面積；一綜合考慮新增混凝土和鋼筋強度利用程度的修正系數(shù)，取值為0.8。新增縱向受力鋼筋圖4.1軸心受壓構(gòu)件增大截面加固表4.1鋼筋混凝土軸心受壓構(gòu)件穩(wěn)定系數(shù)<=81012141618202224262830%］日<=78.510.5121415.517192122.52426<=283542485562697683909704伊1.00.950.870.860.790.750.700.650.600.600.560.52值ChapterIGeneralprovisionsarticleIobligationtoclearcreditpre-loaninvestigationrequirements,improvethequalityofpre-loaninvestigation,preventcreditrisks,accordingtotheCBRCcommercialbankcreditduediligenceguidelines,commercialbankcreditsmallbusinessduediligenceguidelines(trial)andotherregulatoryrequirementsandtheactualsituationoftheBank,thesemeasuresareformulated.Secondpersonmentionedinthesemeasuresreferstoinaccordancewiththerulesofcreditinvestigations,surveysandanalysisofthecreditbusinesspeople.ArticlecreditmentionedinthesemeasuresreferstotableprovidedtocustomersbothinsideandoutsideoftheBank'screditbusiness,includingforeigncurrencyloans,tradefinance,bankacceptances,commercialbilldiscounting,guarantees,factoring,credit,loancommitment,guaranteeandothercreditoperations,excludingclientcreditbusiness.Priortothechengdaiinvestigationintothefourtharticlethisreferstocreditbeforethereview,investigatorsbyobtaining,verification,analysisandsecurityaspectsofthesituation,evaluationandrevealsthepossiblecreditrisksandtoproposepreventivemeasures.Articlefifthduediligenceinthesemeasuresreferstothepersoninthepre-loaninvestigationproceduresfulfillingthemostbasicduediligencerequirements.Articlesixthofthemselves,pre-loaninvestigatorsrelativesorotherinterestedpersontoapplyforthecreditbusiness,oneshouldapplyforthewithdrawal.ChapterIIduediligenceduediligenceworkisthebasicrequirementoftheseventharticle:followtheprinciplesoftrue,complete,valid,anddiligenceduediligenceincarryingoutinvestigationduties.Investigatorsshouldbebasedonthecharacteristicsofdifferentvarietiesofcreditbusiness,credit■注:表中〈為構(gòu)件計算長度;b為矩形截面短邊尺寸;d為圓形截面直徑;i為截面最小皴轉(zhuǎn)半徑。2采用增大截面加固鋼筋加固鋼筋混凝土偏心受壓構(gòu)件時，其矩形截面正截面承載力應(yīng)符合下列規(guī)定:1相對界限受壓區(qū)高度系數(shù)應(yīng)按加固前的控制值采用；2正截面承載力應(yīng)按下列公式計算：點中方「耳'+瓦q冉—（"-DI， 「 I I,片〔過準(zhǔn)"婦-亍十/舛Wf-曲）十無，且y仇-十頭4閂-嘩；（42-2）0■珞二（1—0.8A5法）歸＜.f-再 〔4：嘉3才J=f”一婦一】〕E?J￡以 （4.2叫）X貝=［些-n辦 如疔.式中：一系數(shù)，按本規(guī)范第2.3條的規(guī)定取值；一新增混凝土和原構(gòu)件混凝土軸心抗壓強度設(shè)計值的平均值；ICm一原構(gòu)件受壓鋼筋應(yīng)力；Oso一原構(gòu)件受壓鋼筋應(yīng)力；也廣/眼％ =Aos一受拉邊或受壓較小邊的新增縱向鋼筋應(yīng)力；當(dāng)算得；一分別為原構(gòu)件受拉和受壓鋼筋截面面積；■e一偏心距，為軸向壓力設(shè)計值N的作用點至新增受拉鋼筋合力點的距離;一原構(gòu)件受拉鋼筋合力點到加固后截面受拉邊緣的距離；一原構(gòu)件受壓鋼筋合力點到加固后截面受壓邊緣的距離；ho一新增鋼筋合力點到加固后截面受壓邊緣的距離。I3偏心距。應(yīng)按現(xiàn)行設(shè)計規(guī)范GB50010的規(guī)定進行計算，但其增大系數(shù)尚應(yīng)乘以下列修正系數(shù)：⑴對圍套或其他對稱形式的加固:當(dāng) %=1.1；當(dāng)端/h<Q：3時： 料=\履(2)對非對稱形式的加固：當(dāng)％伍》睛時* %=1.2；當(dāng)/h<Q：3時， 料=1樂ChapterIGeneralprovisionsarticleIobligationtoclearcreditpre-loaninvestigationrequirements,improvethequalityofpre-loaninvestigation,preventcreditrisks,accordingtotheCBRCcommercialbankcreditduediligenceguidelines,commercialbankcreditsmallbusinessduediligenceguidelines(trial)andotherregulatoryrequirementsandtheactualsituationoftheBank,thesemeasuresareformulated.Secondpersonmentionedinthesemeasuresreferstoinaccordancewiththerulesofcreditinvestigations,surveysandanalysisofthecreditbusinesspeople.ArticlecreditmentionedinthesemeasuresreferstotableprovidedtocustomersbothinsideandoutsideoftheBank'screditbusiness,includingforeigncurrencyloans,tradefinance,bankacceptances,commercialbilldiscounting,guarantees,factoring,credit,loancommitment,guaranteeandothercreditoperations,excludingclientcreditbusiness.Priortothechengdaiinvestigationintothefourtharticlethisreferstocreditbeforethereview,investigatorsbyobtaining,verification,analysisandsecurityaspectsofthesituation,evaluationandrevealsthepossiblecreditrisksandtoproposepreventivemeasures.Articlefifthduediligenceinthesemeasuresreferstothepersoninthepre-loaninvestigationproceduresfulfillingthemostbasicduediligencerequirements.Articlesixthofthemselves,pre-loaninvestigatorsrelativesorotherinterestedpersontoapplyforthecreditbusiness,oneshouldapplyforthewithdrawal.ChapterIIduediligenceduediligenceworkisthebasicrequirementoftheseventharticle:followtheprinciplesoftrue,complete,valid,anddiligenceduediligenceincarryingoutinvestigationduties.Investigatorsshouldbebasedonthecharacteristicsofdifferentvarietiesofcreditbusiness,credit構(gòu)造規(guī)定1新增混凝土層的最小厚度，對板不應(yīng)小于40mm;對梁、柱，采用人工澆筑時，不應(yīng)小于50mm，采用噴射混凝土施工時，不應(yīng)小于50mm。2加固用的鋼筋，應(yīng)采用熱軋鋼筋。板的受力鋼筋直徑不應(yīng)小于6mm;梁的受力鋼筋直徑不應(yīng)小于12mm;柱的受力鋼筋直徑不應(yīng)小于14mm;加錨式箍筋直徑不應(yīng)小于8mm，U形箍直徑應(yīng)與原箍筋直徑相同，分布筋直徑應(yīng)取6mm。3新增受力鋼筋與原受力鋼筋間的凈距不應(yīng)小于20mm，并應(yīng)采用短筋或箍筋與原鋼筋焊接;其構(gòu)造應(yīng)符合下列要求：3（1當(dāng)新增受力鋼筋與原受力鋼筋采用短筋焊接時，短筋的直徑不應(yīng)小于20mm，長度不應(yīng)小于5d，各短筋的中距不應(yīng)大于500mm（圖5.3，a）。3（2當(dāng)用單側(cè)或雙側(cè)加固時，應(yīng)設(shè)置U型箍筋（圖5.3，b）。U型箍筋應(yīng)焊在原有箍筋上，單面焊縫長度為10d，雙面焊接為5d（d為U型箍筋直徑）。注:當(dāng)受構(gòu)造條件限制必需采用植筋方式埋設(shè)U型箍（圖5.3,c）時，應(yīng)采用錨固專用的結(jié)構(gòu)膠種植;不得采用自行配制的環(huán)氧樹脂漿或其他水泥砂漿。3（3當(dāng)用混凝土圍套進行加固時，應(yīng)設(shè)置加錨式箍筋（圖5.3,d或e）。

u，*君A-dr-Tu'l用用梢皎詞.電u，*君A-dr-Tu'l用用梢皎詞.電圖5.3增大截面配置新增箍筋的連接構(gòu)造ChapterIGeneralprovisionsarticleIobligationtoclearcreditpre-loaninvestigationrequirements,improvethequalityofpre-loaninvestigation,preventcreditrisks,accordingtotheCBRCcommercialbankcreditduediligenceguidelines,commercialbankcreditsmallbusinessduediligenceguidelines(trial)andotherregulatoryrequirementsandtheactualsituationoftheBank,thesemeasuresareformulated.Secondpersonmentionedinthesemeasuresreferstoinaccordancewiththerulesofcreditinvestigations,surveysandanalysisofthecreditbusinesspeople.ArticlecreditmentionedinthesemeasuresreferstotableprovidedtocustomersbothinsideandoutsideoftheBank'screditbusiness,includingforeigncurrencyloans,tradefinance,bankacceptances,commercialbilldiscounting,guarantees,factoring,credit,loancommitment,guaranteeandothercreditoperations,excludingclientcreditbusiness.Priortothechengdaiinvestigationintothefourtharticlethisreferstocreditbeforethereview,investigatorsbyobtaining,verification,analysisandsecurityaspectsofthesituation,evaluationandrevealsthepossiblecreditrisksandtoproposepreventivemeasures.Articlefifthduediligenceinthesemeasuresreferstothepersoninthepre-loaninvestigationproceduresfulfillingthemostbasicduediligencerequirements.Articlesixthofthemselves,pre-loaninvestigatorsrelativesorotherinterestedpersontoapplyforthecreditbusiness,oneshouldapplyforthewithdrawal.ChapterIIduediligenceduediligenceworkisthebasicrequirementoftheseventharticle:followtheprinciplesoftrue,complete,valid,anddiligenceduediligenceincarryingoutinvestigationduties.Investigatorsshouldbebasedonthecharacteristicsofdifferentvarietiesofcreditbusiness,credit4梁的新增縱向受力鋼筋，其兩端應(yīng)可靠錨固;柱的新增縱向受力鋼筋的下端應(yīng)伸入基礎(chǔ)并應(yīng)滿足錨固要求;上端應(yīng)穿過樓板與上層柱腳連接或在屋面板處封頂錨固。材料選用1、 外包混凝土建議采用GMA無收縮自流密實細骨料混凝土，可達到高強度、免振搗、無收縮、新老混凝土界面粘結(jié)好的效果。骨料最大粒徑根據(jù)施工具體條件而定，混凝土配合比及施工工藝可從固特邦公司獲得技術(shù)支持。2、 新老混凝土的界面處理可參見N-J混凝土界面處理劑及新老混凝土界面粘結(jié)的有關(guān)內(nèi)容。3、植筋技術(shù)參見JN-Z植筋錨固膠及后錨固技術(shù)有關(guān)內(nèi)容。ChapterIGeneralprovisionsarticleIobligationtoclearcreditpre-loaninvestigationrequirements,improvethequalityofpre-loaninvestigation,prevent