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疊合梁驗(yàn)算,,,,,,,,,,,,,,,,,,

1、以梁,,KZL5,,為計(jì)算依據(jù),,,,第一次澆注高度:,,,,1800,",第二次澆注高度",,,,1200,,

砼強(qiáng)度達(dá)到設(shè)計(jì)強(qiáng)度的70%×C45=C30,再進(jìn)行上部施工。,,,,,,,,,,,,,,,,,,

設(shè)計(jì)梁截面,,b=,900,,h=,3000,,,鋼筋配筋按原設(shè)計(jì)圖。,,,,,,,,,

第一次疊合截面,,b=,900,,h=,3000,,,,,,,,,,,,

在施工過(guò)程中梁下支撐只考慮疊合梁下部h1高度內(nèi)荷載,上部高度h2的自重和施工荷載,,,,,,,,,,,,,,,,,,

有第一次澆注的h1高度來(lái)承受,故按施工階段不加支撐的疊合梁受彎構(gòu)建計(jì)算,即b*h1=,,,,,,,,,,,,,,,,900,,×

1800,的簡(jiǎn)支梁計(jì)算。驗(yàn)算該梁是否能承受第二次澆注梁的施工荷載及自重。,,,,,,,,,,,,,,,,,

(1)荷載取值,,,(按第一次疊合計(jì)算),,,,,,,,,,,,,,,

恒載,,,,,,,,,,,,,,,,,,

模板自重,0.5,×,0.9,=,0.45,KN/m,,,,,,,,,,,,

梁砼自重,24,×,0.9,×,3,=,64.8,KN/m,,,,,,,,,,

鋼筋自重,1.5,×,0.9,×,3,=,4.05,KN/m,,,,,,,,,,

合計(jì)G1K,0.45,+,64.8,+,4.05,=,69.3,KN/m,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,

活載,,,,,,,,,,,,,,,,,,

施工人員,1,×,0.9,=,0.9,KN/m,,,,,,,,,,,,

振搗,2,×,0.9,=,1.8,KN/m,,,,,,,,,,,,

合計(jì)Q1K,0.9,+,1.8,=,2.7,KN/m,,,,,,,,,,,,

(2)荷載組合,,,,,,,,,,,,,,,,,,

由可變荷載控制q1,,=,1.2,×,69.3,+,1.4,×,2.7,=,86.94,KN/m,,,,,,

由永久荷載控制q2,,=,1.35,×,69.3,+,1.4,×,2.7,×,0.7,=,96.201,KN/m,,,,

取q=,96.201,KN/m計(jì)算,,,,,,,,,,,,,,,,

(3)按簡(jiǎn)支梁計(jì)算,,,,,,,,,,,,,,,,,,

,,,q=,96.201,,KN/m,,,,,,,,,,,,

,,,,8.7,,,,,,,,,,,,,,

L取,8.7,取b*h=,,900,,×,1800,,強(qiáng)度等級(jí)取C30,,,,fc,=,14.3,,,

Mmax=,1/8×,96.201,,×,8.7,×,8.7,=,910.1817113,,KN·m,,,,,,,

Vmax=,1/2×,96.201,,×,8.7,=,418.47435,,KN,,,,,,,,,

h01=,1740,,,,,,,,,,,,,,,,,

按受彎承載力驗(yàn)算,,,,,,,,,,,,,,,,,,

按b×h=,900,×,1800,所能承受的極限彎矩M1u>Mmax才能滿足要求;,,,,,,,,,,,,,,

求M1u,查設(shè)計(jì)圖紙,,,,KZL5,梁底配筋總面積,,,,As,=,19292.16,,,mm2,,,,,

矩形截面:,,,,,,,,,,,,,,,,,,

χ=,fyAs,=,360,×,19292.16,,=,539.6408392,,mm,,,,,,,,

,α1fcb,,14.3,×,900,,,,,,,,,,,,,

M1u=α1fcbχ(h01-0.5χ),,,,=,10210.65829,,,KN·m,,>Mmax=,,910.1817113,,KN·m,,,,

,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,KZL5,

ξ=,χ,=,539.6408392,=,0.310138413,,<,0.518,,,,,,,,,,

,h01,,1740,,,,,,,,,,,,,,,

斜截面受剪承載力驗(yàn)算,,,,,,,,,,,,,,,,,,

(1)驗(yàn)算截面尺寸:,,,0.25βcfcbh01=,,,0.25,×,1,×,14.3,×,900,×,1740,=,5598.45,,

>,Vmax=,418.47435,,,KN,,,,,,,,,,,,,

滿足要求,,,,,,,,,,,,,,,,,,

(2)斜截面抗剪,,,,,,,,,,,,,,,,,,

按設(shè)計(jì)圖紙箍筋,,12,@,100,,10,,,,,,,,,,,,

,AsV,=,113.04,,×,10,=,11.304,,,,,,,,,,

,s,,100,,,,,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范7.5.4-2式,,,,,,,,,,,,,,,,,,

Vc=,0.7ftbh01+1.25fy,,,AsV,,h01,,,,,,,,,,,,

,,,,s,,,,,,,,,,,,,,

=,0.7,×,1.43,×,900,×,1740,+,1.25,×,360,×,11.304,×,1740,,,

=,10418.598,>,Vmax=,418.47435,,KN,,,,,,,,,,,,

疊合面受剪承載力驗(yàn)算,,,,,,,,,砼按C30考慮,,,,,,,,,

查設(shè)計(jì)計(jì)算書(shū)(設(shè)計(jì)提供的彎矩、剪力包絡(luò)圖)Vmax=,,,,,,,,,,,11460,,KN,,,,,

h0=,3000,-,60,=,2940,,,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范10.6.5-1式,,,,,,,,,,,,,,,,,,

V=1.2ftbh0+0.85fyv,,ASV,h0,=,1.2,×,1.43,×,900,×,2940,+,0.85,×,360,×,11.304,

,,S,,,,,,,,,,,,,,,,

,,,,,×,2940,,,,,,,,,,,,

,,,,=,14710.06656,,,,>,Vmax=,,11460,,KN,,,,

∴疊合面可不加抗剪短筋,,,,,,,,,,,,,,,,,,

鋼筋應(yīng)力驗(yàn)算,,,,,,,,,,,,,,,,,,

在施工階段:恒載標(biāo)準(zhǔn)值G1k=,,,,,,69.3,,KN/m,,,,,,,,,,

M1Gk=,1/8×G1K×L2,,,=,655.664625,,KN·m,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范10.6.8-3式,,,,,,,,,,,,,,,,,,

σs1k=,M1Gk,,=,655664625,,,,,,,,=,22.45082977,,N/mm2,,,

,0.87Ash01,,,0.87,,×,19292.16,,×,1740,,,,,,,,

因,M1Gk,=,655.664625,,<,0.35,,M,=,5607.35,,,,,,,,

σs2k=,M2k,,=,12323846154,,,,,,,,=,249.7461661,N/mm2,,,,

,0.87Ash01,,,0.87,,×,19292.16,,×,2940,,,,,,,,

M2k---在正常使用階段的彎矩標(biāo)準(zhǔn)值,查彎設(shè)計(jì)矩圖:,,,,,,,,,,,,,,,,,,

M2k=,M/1.3,=,16021,,/,1.3,,=,12323.84615,,KN·m,,,,,,,

σsk=,σs1k,+,σs2k,=,22.45082977,+,249.7461661,=,272.1969959,<,0.9,×,360,=,324,,,

滿足要求,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,

施工階段h1高度梁最大裂縫驗(yàn)算,,,,,,,,,,,,,,,,,KZL5,

砼強(qiáng)度按C30,,ftk=,,2.01,,N/mm2,,,HRB400,,Es=,200000,,N,/mm2,,,

保護(hù)層厚度C=,,25,,鋼筋直徑d,,,32,,,,,,,,,,,

M1k=,M1Gk,+,M1Qk,=,681.21,,KN·m,,,,,,,,,,,

按混凝土設(shè)計(jì)規(guī)范8.1.2-4式:,,,,,,,,,,,,,,,,,,

ρtel=,As,=,19292.16,,,,,=,0.023817481,,,,,,,,,

,0.5bh1,,0.5,×,900,×,1800,,,,,,,,,,,

按混凝土設(shè)計(jì)規(guī)范8.1.3-3式:,,,,,,,,,,,,,,,,,,

δ1k=,M1K,,=,681210000,,,,,,,,=,23.32553742,,,,,

,0.87h01As,,,0.87,,×,1740,,×,19292.16,,,,,,,,

按混凝土設(shè)計(jì)規(guī)范8.1.2-2式:,,,,,,,,,,,,,,,,,,

φ=,1.1-0.65,,ftk,,,=,1.1,-,0.65,2.01,,,,=,-1.2517,,<,0.2

,,,ρtel×δ1k,,,,,,,0.023817481,×,23.32553742,,,,,,

取φ=,0.2,,,,,,,,,,,,,,,,,

裂縫寬度:,,,,,,,,,,,,,,,,,,

ωmax=,αcrφ,δ1k,,(1.9C,,+,0.08,d,,),,,,,,,,

,,Es,,,,,,ρtel,,,,,,,,,,

=,2.1,×,0.2,×,23.32553742,,,×,(,1.9,×,25,+,0.08,×,32,,)

,,,,,200000,,,,,,,,,,,0.023817481,,

=,0.007591682,<,0.2,mm,,,,,,,,,,,,,,

滿足要求,,,,,,,,,,,,,,,,,,

梁下支撐在轉(zhuǎn)換層施工期間不拆除,梁撓度不必進(jìn)行驗(yàn)算,滿足要求。,,,,,,,,,,,,,,,,,,

2、以梁,,KZL29,,為計(jì)算依據(jù),,,,第一次澆注高度:,,,,1300,",第二次澆注高度",,,,1200,,

,,,,砼強(qiáng)度達(dá)到設(shè)計(jì)強(qiáng)度的70%*C45=C30,再進(jìn)行上部施工。,,,,,,,,,,,,,,

設(shè)計(jì)梁截面,,b=,800,,h=,2500,,,鋼筋配筋按原設(shè)計(jì)圖。,,,,,,,,,

第一次疊合截面,,b=,800,,h=,2500,,,,,,,,,,,,

在施工過(guò)程中梁下支撐只考慮疊合梁下部h1高度內(nèi)荷載,上部高度h2的自重和施工荷載,,,,,,,,,,,,,,,,,,

有第一次澆注的h1高度來(lái)承受,故按施工階段不加支撐的疊合梁受彎構(gòu)建計(jì)算,即b*h1=,,,,,,,,,,,,,,,,800,,×

1300,的簡(jiǎn)支梁計(jì)算。驗(yàn)算該梁是否能承受第二次澆注梁的施工荷載及自重。,,,,,,,,,,,,,,,,,

(1)荷載取值,,,(按第一次疊合計(jì)算),,,,,,,,,,,,,,,

恒載,,,,,,,,,,,,,,,,,,

模板自重,0.5,×,0.8,=,0.4,KN/m,,,,,,,,,,,,

梁砼自重,24,×,0.8,×,2.5,=,48,KN/m,,,,,,,,,,

鋼筋自重,1.5,×,0.8,×,2.5,=,3,KN/m,,,,,,,,,,

合計(jì)G1K,0.4,+,48,+,3,=,51.4,KN/m,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,

活載,,,,,,,,,,,,,,,,,,

施工人員,1,×,0.8,=,0.8,KN/m,,,,,,,,,,,,

振搗,2,×,0.8,=,1.6,KN/m,,,,,,,,,,,,

合計(jì)Q1K,0.8,+,1.6,=,2.4,KN/m,,,,,,,,,,,,

(2)荷載組合,,,,,,,,,,,,,,,,,,

由可變荷載控制q1,,=,1.2,×,51.4,+,1.4,×,2.4,=,65.04,KN/m,,,,,,

由永久荷載控制q2,,=,1.35,×,51.4,+,1.4,×,2.4,×,0.7,=,71.742,KN/m,,,,

取q=,71.742,KN/m計(jì)算,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,KZL29,

(3)按簡(jiǎn)支梁計(jì)算,,,,,,,,,,,,,,,,,,

,,,q=,71.742,,KN/m,,,,,,,,,,,,

,,,,8.2,,,,,,,,,,,,,,

L取,8.2,取b*h=,,900,,×,1300,,強(qiáng)度等級(jí)取C30,,,,fc,=,14.3,,,

Mmax=,1/8×,71.742,,×,8.2,×,8.2,=,602.99151,,KN·m,,,,,,,

Vmax=,1/2×,71.742,,×,8.2,=,294.1422,,KN,,,,,,,,,

h01=,1240,,,,,,,,,,,,,,,,,

按受彎承載力驗(yàn)算,,,,,,,,,,,,,,,,,,

按b×h=,800,×,1300,所能承受的極限彎矩M1u>Mmax才能滿足要求;,,,,,,,,,,,,,,

求M1u,查設(shè)計(jì)圖紙,,,,KZL29,梁底配筋總面積,,,,As,=,18463.2,,,mm2,,,,,

矩形截面:,,,,,,,,,,,,,,,,,,

χ=,fyAs,=,360,×,18463.2,,=,581.0097902,,mm,,,,,,,,

,α1fcb,,14.3,×,800,,,,,,,,,,,,,

M1u=α1fcbχ(h01-0.5χ),,,,=,6311.058487,,,KN·m,,>Mmax=,,602.99151,,KN·m,,,,

ξ=,χ,=,581.0097902,=,0.468556282,,<,0.518,,,,,,,,,,

,h01,,1240,,,,,,,,,,,,,,,

梁超筋,因梁下有可靠支撐且極限彎矩大于實(shí)際使用彎矩,故不考慮超筋壞。,,,,,,,,,,,,,,,,,,

斜截面受剪承載力驗(yàn)算,,,,,,,,,,,,,,,,,,

(1)驗(yàn)算截面尺寸:,,,0.25βcfcbh01=,,,0.25,×,1,×,14.3,×,800,×,1240,=,3546.4,,

>,Vmax=,294.1422,,,KN,,,,,,,,,,,,,

滿足要求,,,,,,,,,,,,,,,,,,

(2)斜截面抗剪,,,,,,,,,,,,,,,,,,

按設(shè)計(jì)圖紙箍筋,,12,@,100,,6,,,,,,,,,,,,

,AsV,=,113.04,,×,6,,=,6.7824,,,,,,,,,

,s,,100,,,,,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范7.5.4-2式,,,,,,,,,,,,,,,,,,

Vc=,0.7ftbh01+1.25fy,,,AsV,,h01,,,,,,,,,,,,

,,,,s,,,,,,,,,,,,,,

=,0.7,×,1.43,×,800,×,1240,+,1.25,×,360,×,6.7824,×,1240,,,

=,4777.5712,>,Vmax=,294.1422,,KN,,,,,,,,,,,,

疊合面受剪承載力驗(yàn)算,,,,,,,,,砼按C30考慮,,,,,,,,,

查設(shè)計(jì)計(jì)算書(shū)(設(shè)計(jì)提供的彎矩、剪力包絡(luò)圖)Vmax=,,,,,,,,,,,4520,,KN,,,,,

h0=,2500,-,60,=,2440,,,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范10.6.5-1式,,,,,,,,,,,,,,,,,,

V=1.2ftbh0+0.85fyv,,ASV,h0,=,1.2,×,1.43,×,800,×,2440,+,0.85,×,360,×,6.7824,

,,S,,,,,,,,,,,,,,,,

,,,,,×,2440,,,,,,,,,,,,

,,,,=,8413.643136,,,,>,Vmax=,,4520,,KN,,,,

∴疊合面可不加抗剪短筋,,,,,,,,,,,,,,,,,KZL29,

鋼筋應(yīng)力驗(yàn)算,,,,,,,,,,,,,,,,,,

在施工階段:恒載標(biāo)準(zhǔn)值G1k=,,,,,,51.4,,KN/m,,,,,,,,,,

M1Gk=,1/8×G1K×L2,,,=,432.017,,KN·m,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范10.6.8-3式,,,,,,,,,,,,,,,,,,

σs1k=,M1Gk,,=,432017000,,,,,,,,=,21.68966902,N/mm2,,,,

,0.87Ash01,,,0.87,,×,18463.2,,×,1240,,,,,,,,

因,M1Gk,=,432.017,,<,0.35,,M1u,=,3867.85,,,,,,,,

σs2k=,M2k,,=,8500769231,,,,,,,,=,216.8913208,N/mm2,,,,

,0.87Ash01,,,0.87,,×,18463.2,,×,2440,,,,,,,,

M2k---在正常使用階段的彎矩標(biāo)準(zhǔn)值,查設(shè)計(jì)彎矩圖:,,,,,,,,,,,,,,,,,,

M2k=,M/1.3,=,11051,,/,1.3,,=,8500.769231,,KN·m,,,,,,,

σsk=,σs1k,+,σs2k,=,21.68966902,+,216.8913208,=,238.5809898,<,0.9,×,360,=,324,,,

滿足要求,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,

施工階段h1高度梁最大裂縫驗(yàn)算,,,,,,,,,,,,,,,,,,

砼強(qiáng)度按C30,,ftk=,,2.01,,N/mm2,,,HRB400,,Es=,200000,,N,/mm2,,,

保護(hù)層厚度C=,,25,,鋼筋直徑d,,,28,,,,,,,,,,,

M1k=,M1Gk,+,M1Qk,=,452.189,,KN·m,,,,,,,,,,,

按混凝土設(shè)計(jì)規(guī)范8.1.2-4式:,,,,,,,,,,,,,,,,,,

ρtel=,As,=,18463.2,,,,,=,0.035506154,,,,,,,,,

,0.5bh1,,0.5,×,800,×,1300,,,,,,,,,,,

按混凝土設(shè)計(jì)規(guī)范8.1.3-3式:,,,,,,,,,,,,,,,,,,

δ1k=,M1K,,=,452189000,,,,,,,,=,22.70241621,,N/mm,,,

,0.87h01As,,,0.87,,×,1240,,×,18463.2,,,,,,,,

按混凝土設(shè)計(jì)規(guī)范8.1.2-2式:,,,,,,,,,,,,,,,,,,

φ=,1.1-0.65,,ftk,,,=,1.1,-,0.65,2.01,,,,=,-0.520815951,,<,0.2

,,,ρtel×δ1k,,,,,,,0.035506154,,×,22.70241621,,,,,

取φ=,0.2,,,,,,,,,,,,,,,,,

裂縫寬度:,,,,,,,,,,,,,,,,,,

Wmax=,αcrφ,δ1k,,(1.9C,,+,0.08,d,,),,,,,,,,

,,Es,,,,,,ρtel,,,,,,,,,,

=,2.1,×,0.2,×,22.70241621,,,×,(,1.9,×,25,+,0.08,×,28,,)

,,,,,200000,,,,,,,,,,,0.035506154,,

=,0.005272275,<,0.2,mm,,,,,,,,,,,,,,

滿足要求,,,,,,,,,,,,,,,,,,

梁下支撐在轉(zhuǎn)換層施工期間不拆除,梁撓度不必進(jìn)行驗(yàn)算,滿足要求。,,,,,,,,,,,,,,,,,,

3、以梁,,KZL27,,為計(jì)算依據(jù),,,,第一次澆注高度:,,,,1300,",第二次澆注高度",,,,1200,,

,,,,砼強(qiáng)度達(dá)到設(shè)計(jì)強(qiáng)度的70%*C45=C30,再進(jìn)行上部施工。,,,,,,,,,,,,,,

設(shè)計(jì)梁截面,,b=,800,,h=,2500,,,鋼筋配筋按原設(shè)計(jì)圖。,,,,,,,,,

第一次疊合截面,,b=,800,,h=,2500,,,,,,,,,,,,

在施工過(guò)程中梁下支撐只考慮疊合梁下部h1高度內(nèi)荷載,上部高度h2的自重和施工荷載,,,,,,,,,,,,,,,,,KZL27,

由第一次澆注的h1高度來(lái)承受,故按施工階段不加支撐的疊合梁受彎構(gòu)建計(jì)算,即b*h1=,,,,,,,,,,,,,,,,800,,×

1300,的簡(jiǎn)支梁計(jì)算。驗(yàn)算該梁是否能承受第二次澆注梁的施工荷載及自重。,,,,,,,,,,,,,,,,,

(1)荷載取值,,,(按第一次疊合計(jì)算),,,,,,,,,,,,,,,

恒載,,,,,,,,,,,,,,,,,,

模板自重,0.5,×,0.8,=,0.4,KN/m,,,,,,,,,,,,

梁砼自重,24,×,0.8,×,2.5,=,48,KN/m,,,,,,,,,,

鋼筋自重,1.5,×,0.8,×,2.5,=,3,KN/m,,,,,,,,,,

合計(jì)G1K,0.4,+,48,+,3,=,51.4,KN/m,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,

活載,,,,,,,,,,,,,,,,,,

施工人員,1,×,0.8,=,0.8,KN/m,,,,,,,,,,,,

振搗,2,×,0.8,=,1.6,KN/m,,,,,,,,,,,,

合計(jì)Q1K,0.8,+,1.6,=,2.4,KN/m,,,,,,,,,,,,

(2)荷載組合,,,,,,,,,,,,,,,,,,

由可變荷載控制q1,,=,1.2,×,51.4,+,1.4,×,2.4,=,65.04,KN/m,,,,,,

由永久荷載控制q2,,=,1.35,×,51.4,+,1.4,×,2.4,×,0.7,=,71.742,KN/m,,,,

取q=,71.742,KN/m計(jì)算,,,,,,,,,,,,,,,,

(3)按簡(jiǎn)支梁計(jì)算,,,,,,,,,,,,,,,,,,

,,,q=,71.742,,KN/m,,,,,,,,,,,,

,,,,8.2,,,,,,,,,,,,,,

L取,8.7,取b*h=,,800,,×,1300,,強(qiáng)度等級(jí)取C30,,,,fc,=,14.3,,,

Mmax=,1/8×,71.742,,×,8.2,×,8.2,=,602.99151,,KN·m,,,,,,,

Vmax=,1/2×,71.742,,×,8.2,=,294.1422,,KN,,,,,,,,,

h01=,1240,,,,,,,,,,,,,,,,,

按受彎承載力驗(yàn)算,,,,,,,,,,,,,,,,,,

按b×h=,800,×,1300,所能承受的極限彎矩M1u>Mmax才能滿足要求;,,,,,,,,,,,,,,

求M1u,查設(shè)計(jì)圖紙,,,,KZL27,梁底配筋總面積,,,,As,=,24115.2,,,mm2,,,,,

矩形截面:,,,,,,,,,,,,,,,,,,

χ=,fyAs,=,360,×,24115.2,,=,758.8699301,,mm,,,,,,,,

,α1fcb,,14.3,×,800,,,,,,,,,,,,,

M1u=α1fcbχ(h01-0.5χ),,,,=,7470.971255,,,KN·m,,>Mmax=,,602.99151,,KN·m,,,,

ξ=,χ,=,758.8699301,=,0.611991879,,>,0.518,,,,,,,,,,

,h01,,1240,,,,,,,,,,,,,,,

梁超筋,因梁下有可靠支撐且極限彎矩大于實(shí)際使用彎矩,故不考慮超筋壞。,,,,,,,,,,,,,,,,,,

斜截面受剪承載力驗(yàn)算,,,,,,,,,,,,,,,,,,

(1)驗(yàn)算截面尺寸:,,,0.25βcfcbh01=,,,0.25,×,1,×,14.3,×,800,×,1240,=,3546.4,,

>,Vmax=,294.1422,,,KN,,,,,,,,,,,,,

滿足要求,,,,,,,,,,,,,,,,,KZL27,

(2)斜截面抗剪,,,,,,,,,,,,,,,,,,

按設(shè)計(jì)圖紙箍筋,,12,@,100,,8,,,,,,,,,,,,

,AsV,=,113.04,,×,8,,=,9.0432,,,,,,,,,

,s,,100,,,,,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范7.5.4-2式,,,,,,,,,,,,,,,,,,

Vc=,0.7ftbh01+1.25fy,,,AsV,,h01,,,,,,,,,,,,

,,,,s,,,,,,,,,,,,,,

=,0.7,×,1.43,×,800,×,1240,+,1.25,×,360,×,9.0432,×,1240,,,

=,6039.0976,>,Vmax=,294.1422,,KN,,,,,,,,,,,,

疊合面受剪承載力驗(yàn)算,,,,,,,,,砼按C30考慮,,,,,,,,,

查設(shè)計(jì)計(jì)算書(shū)(設(shè)計(jì)提供的彎矩、剪力包絡(luò)圖)Vmax=,,,,,,,,,,,6985,,KN,,,,,

h0=,2500,-,60,=,2440,,,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范10.6.5-1式,,,,,,,,,,,,,,,,,,

V=1.2ftbh0+0.85fyv,,ASV,h0,=,1.2,×,1.43,×,800,×,2440,+,0.85,×,360,×,9.0432,

,,S,,,,,,,,,,,,,,,,

,,,,,×,2440,,,,,,,,,,,,

,,,,=,10101.64685,,,,>,Vmax=,,6985,,KN,,,,

∴疊合面可不加抗剪短筋,,,,,,,,,,,,,,,,,,

鋼筋應(yīng)力驗(yàn)算,,,,,,,,,,,,,,,,,,

在施工階段:恒載標(biāo)準(zhǔn)值G1k=,,,,,,51.4,,KN/m,,,,,,,,,,

M1Gk=,1/8×G1K×L2,,,=,432.017,,KN·m,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范10.6.8-3式,,,,,,,,,,,,,,,,,,

σs1k=,M1Gk,,=,432017000,,,,,,,,=,16.60615284,N/mm2,,,,

,0.87Ash01,,,0.87,,×,24115.2,,×,1240,,,,,,,,

因,M1Gk,=,432.017,,<,0.35,,M1u,=,4475.45,,,,,,,,

σs2k=,M2k,,=,9836153846,,,,,,,,=,192.1433533,N/mm2,,,,

,0.87Ash0,,,0.87,,×,24115.2,,×,2440,,,,,,,,

M2k---在正常使用階段的彎矩標(biāo)準(zhǔn)值,查設(shè)計(jì)彎矩圖:,,,,,,,,,,,,,,,,,,

M2k=,M/1.3,=,12787,,/,1.3,,=,9836.153846,,KN·m,,,,,,,

σsk=,σs1k,+,σs2k,=,16.60615284,+,192.1433533,=,208.7495062,<,0.9,×,360,=,324,,,

滿足要求,,,,,,,,,,,,,,,,,,

施工階段h1高度梁最大裂縫驗(yàn)算,,,,,,,,,,,,,,,,,,

砼強(qiáng)度按C30,,ftk=,,2.01,,N/mm2,,,HRB400,,Es=,200000,,N,/mm2,,,

保護(hù)層厚度C=,,25,,鋼筋直徑d,,,32,,,,,,,,,,,

M1k=,M1Gk,+,M1Qk,=,452.189,,KN·m,,,,,,,,,,,

按混凝土設(shè)計(jì)規(guī)范8.1.2-4式:,,,,,,,,,,,,,,,,,,

ρtel=,As,=,24115.2,,,,,=,0.046375385,,,,,,,,,

,0.5bh1,,0.5,×,800,×,1300,,,,,,,,,,,

按混凝土設(shè)計(jì)規(guī)范8.1.3-3式:,,,,,,,,,,,,,,,,,,

δ1k=,M1K,,=,452189000,,,,,,,,=,17.38153741,,,,,

,0.87h01As,,,0.87,,×,1240,,×,24115.2,,,,,,,KZL27,

按混凝土設(shè)計(jì)規(guī)范8.1.2-2式:,,,,,,,,,,,,,,,,,,

φ=,1.1-0.65,,ftk,,,=,1.1,-,0.65,2.01,,,,=,-0.520815951,,<,0.2

,,,ρtel×δ1k,,,,,,,0.046375385,,×,17.38153741,,,,,

取φ=,0.2,,,,,,,,,,,,,,,,,

裂縫寬度:,,,,,,,,,,,,,,,,,,

Wmax=,αcrφ,δ1k,,(1.9C,,+,0.08,d,,),,,,,,,,

,,Es,,,,,,ρtel,,,,,,,,,,

=,2.1,×,0.2,×,17.38153741,,,×,(,1.9,×,25,+,0.08,×,32,,)

,,,,,200000,,,,,,,,,,,0.046375385,,

=,0.003748738,<,0.2,mm,,,,,,,,,,,,,,

滿足要求,,,,,,,,,,,,,,,,,,

梁下支撐在轉(zhuǎn)換層施工期間不拆除,梁撓度不必進(jìn)行驗(yàn)算,滿足要求。,,,,,,,,,,,,,,,,,,

4、以梁,,KZL35,,為計(jì)算依據(jù),,,,第一次澆注高度:,,,,1200,",第二次澆注高度",,,,1200,,

,,,,砼強(qiáng)度達(dá)到設(shè)計(jì)強(qiáng)度的70%*C45=C30,再進(jìn)行上部施工。,,,,,,,,,,,,,,

設(shè)計(jì)梁截面,,b=,800,,h=,2400,,,鋼筋配筋按原設(shè)計(jì)圖。,,,,,,,,,

第一次疊合截面,,b=,800,,h=,2400,,,,,,,,,,,,

在施工過(guò)程中梁下支撐只考慮疊合梁下部h1高度內(nèi)荷載,上部高度h2的自重和施工荷載,,,,,,,,,,,,,,,,,,

有第一次澆注的h1高度來(lái)承受,故按施工階段不加支撐的疊合梁受彎構(gòu)建計(jì)算,即b*h1=,,,,,,,,,,,,,,,,800,,×

1200,的簡(jiǎn)支梁計(jì)算。驗(yàn)算該梁是否能承受第二次澆注梁的施工荷載及自重。,,,,,,,,,,,,,,,,,

(1)荷載取值,,,(按第一次疊合計(jì)算),,,,,,,,,,,,,,,

恒載,,,,,,,,,,,,,,,,,,

模板自重,0.5,×,0.8,=,0.4,KN/m,,,,,,,,,,,,

梁砼自重,24,×,0.8,×,2.4,=,46.08,KN/m,,,,,,,,,,

鋼筋自重,1.5,×,0.8,×,2.4,=,2.88,KN/m,,,,,,,,,,

合計(jì)G1K,0.4,+,46.08,+,2.88,=,49.36,KN/m,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,

活載,,,,,,,,,,,,,,,,,,

施工人員,1,×,0.8,=,0.8,KN/m,,,,,,,,,,,,

振搗,2,×,0.8,=,1.6,KN/m,,,,,,,,,,,,

合計(jì)Q1K,0.8,+,1.6,=,2.4,KN/m,,,,,,,,,,,,

(2)荷載組合,,,,,,,,,,,,,,,,,,

由可變荷載控制q1,,=,1.2,×,49.36,+,1.4,×,2.4,=,62.592,KN/m,,,,,,

由永久荷載控制q2,,=,1.35,×,49.36,+,1.4,×,2.4,×,0.7,=,68.988,KN/m,,,,

取q=,68.988,KN/m計(jì)算,,,,,,,,,,,,,,,,

(3)按簡(jiǎn)支梁計(jì)算,,,,,,,,,,,,,,,,,,

,,,q=,68.988,,KN/m,,,,,,,,,,,,

,,,,6.2,,,,,,,,,,,,,,

L取,6.2,取b*h=,,800,,×,1200,,強(qiáng)度等級(jí)取C30,,,,fc,=,14.3,,,

Mmax=,1/8×,68.988,,×,6.2,×,6.2,=,331.48734,,KN·m,,,,,,,

Vmax=,1/2×,68.988,,×,6.2,=,213.8628,,KN,,,,,,,,KZL35,

h01=,1140,,,,,,,,,,,,,,,,,

按受彎承載力驗(yàn)算,,,,,,,,,,,,,,,,,,

按b×h=,800,×,1200,所能承受的極限彎矩M1u>Mmax才能滿足要求;,,,,,,,,,,,,,,

求M1u,查設(shè)計(jì)圖紙,,,,KZL35,梁底配筋總面積,,,,As,=,12308.8,,,mm2,,,,,

矩形截面:,,,,,,,,,,,,,,,,,,

χ=,fyAs,=,360,×,12308.8,,=,387.3398601,,mm,,,,,,,,

,α1fcb,,14.3,×,800,,,,,,,,,,,,,

M1u=α1fcbχ(h01-0.5χ),,,,=,4193.347523,,,KN·m,,>Mmax=,,331.48734,,KN·m,,,,

,,,,,,,,,,,,,,,,,,,

ξ=,χ,=,387.3398601,=,0.339771807,,<,0.518,,,,,,,,,,

,h01,,1140,,,,,,,,,,,,,,,

斜截面受剪承載力驗(yàn)算,,,,,,,,,,,,,,,,,,

(1)驗(yàn)算截面尺寸:,,,0.25βcfcbh01=,,,0.25,×,1,×,14.3,×,800,×,1140,=,3260.4,,

>,Vmax=,213.8628,,,KN,,,,,,,,,,,,,

滿足要求,,,,,,,,,,,,,,,,,,

(2)斜截面抗剪,,,,,,,,,,,,,,,,,,

按設(shè)計(jì)圖紙箍筋,,12,@,100,,6,,,,,,,,,,,,

,AsV,=,113.04,,×,6,,=,6.7824,,,,,,,,,

,s,,100,,,,,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范7.5.4-2式,,,,,,,,,,,,,,,,,,

Vc=,0.7ftbh01+1.25fy,,,AsV,,h01,,,,,,,,,,,,

,,,,s,,,,,,,,,,,,,,

=,0.7,×,1.43,×,800,×,1140,+,1.25,×,360,×,6.7824,×,1140,,,

=,4392.2832,>,Vmax=,213.8628,,KN,,,,,,,,,,,,

疊合面受剪承載力驗(yàn)算,,,,,,,,,砼按C30考慮,,,,,,,,,

查設(shè)計(jì)計(jì)算書(shū)(設(shè)計(jì)提供的彎矩、剪力包絡(luò)圖)Vmax=,,,,,,,,,,,7280,,KN,,,,,

h0=,2400,-,60,=,2340,,,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范10.6.5-1式,,,,,,,,,,,,,,,,,,

V=1.2ftbh0+0.85fyv,,ASV,h0,=,1.2,×,1.43,×,800,×,2340,+,0.85,×,360,×,6.7824,

,,S,,,,,,,,,,,,,,,,

,,,,,×,2340,,,,,,,,,,,,

,,,,=,8068.821696,,,,>,Vmax=,,7280,,KN,,,,

∴疊合面可不加抗剪短筋,,,,,,,,,,,,,,,,,,

鋼筋應(yīng)力驗(yàn)算,,,,,,,,,,,,,,,,,,

在施工階段:恒載標(biāo)準(zhǔn)值G1k=,,,,,,49.36,,KN/m,,,,,,,,,,

M1Gk=,1/8×G1K×L2,,,=,237.1748,,KN·m,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范10.6.8-3式,,,,,,,,,,,,,,,,,,

σs1k=,M1Gk,,=,237174800,,,,,,,,=,19.42802815,N/mm2,,,,

,0.87Ash01,,,0.87,,×,12308.8,,×,1140,,,,,,,,

因,M1Gk,=,237.1748,,<,0.35,,M1u,=,1467.671633,,,,,,,,

σs2k=,M2k,,=,7350769231,,,,,,,,=,293.3472111,N/mm2,,,,

,0.87Ash0,,,0.87,,×,12308.8,,×,2340,,,,,,,KZL35,

M2k---在正常使用階段的彎矩標(biāo)準(zhǔn)值,查彎矩圖:,,,,,,,,,,,,,,,,,,

M2k=,M/1.3,=,9556,,/,1.3,,=,7350.769231,,KN·m,,,,,,,

σsk=,σs1k,+,σs2k,=,19.42802815,+,293.3472111,=,312.7752392,<,0.9,×,360,=,324,,,

滿足要求,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,

施工階段h1高度梁最大裂縫驗(yàn)算,,,,,,,,,,,,,,,,,,

砼強(qiáng)度按C30,,ftk=,,2.01,,N/mm2,,,HRB400,,Es=,200000,,N,/mm2,,,

保護(hù)層厚度C=,,25,,鋼筋直徑d,,,32,,,,,,,,,,,

M1k=,M1Gk,+,M1Qk,=,248.7068,,KN·m,,,,,,,,,,,

按混凝土設(shè)計(jì)規(guī)范8.1.2-4式:,,,,,,,,,,,,,,,,,,

ρtel=,As,=,12308.8,,,,,=,0.025643333,,,,,,,,,

,0.5bh1,,0.5,×,800,×,1200,,,,,,,,,,,

按混凝土設(shè)計(jì)規(guī)范8.1.3-3式:,,,,,,,,,,,,,,,,,,

δ1k=,M1K,,=,248706800,,,,,,,,=,20.37266485,,,,,

,0.87h01As,,,0.87,,×,1140,,×,12308.8,,,,,,,,

按混凝土設(shè)計(jì)規(guī)范8.1.2-2式:,,,,,,,,,,,,,,,,,,

φ=,1.1-0.65,,ftk,,,=,1.1,-,0.65,2.01,,,,=,-1.400846845,,<,0.2

,,,ρtel×δ1k,,,,,,,0.025643333,,×,20.37266485,,,,,

取φ=,0.2,,,,,,,,,,,,,,,,,

裂縫寬度:,,,,,,,,,,,,,,,,,,

Wmax=,αcrφ,δ1k,,(1.9C,,+,0.08,d,,),,,,,,,,

,,Es,,,,,,ρtel,,,,,,,,,,

=,2.1,×,0.2,×,20.37266485,,,×,(,1.9,×,25,+,0.08,×,32,,)

,,,,,200000,,,,,,,,,,,0.025643333,,

=,0.006303203,<,0.2,mm,,,,,,,,,,,,,,

滿足要求,,,,,,,,,,,,,,,,,,

梁下支撐在轉(zhuǎn)換層施工期間不拆除,梁撓度不必進(jìn)行驗(yàn)算,滿足要求。,,,,,,,,,,,,,,,,,,

5、以梁KZL35(2)800*2000為計(jì)算依據(jù),第一次澆注高度,,,,,,,,,,,800,",第二次澆注高度",,,,1200,,

砼強(qiáng)度達(dá)到設(shè)計(jì)強(qiáng)度的70%*C45=C30,再進(jìn)行上部施工。鋼筋配筋按原設(shè)計(jì)圖。,,,,,,,,,,,,,,,,,,

設(shè)計(jì)梁截面,,b=,800,,h=,2000,,,,,,,,,,,,

在施工過(guò)程中梁下支撐只考慮疊合梁下部h1高度內(nèi)荷載,上部高度h2的自重和施工荷載,,,,,,,,,,,,,,,,,,

由第一次澆注的h1高度來(lái)承受,故按施工階段不加支撐的疊合梁受彎構(gòu)建計(jì)算,即b*h1=800*800,,,,,,,,,,,,,,,,,,

的簡(jiǎn)支梁計(jì)算。驗(yàn)算該梁是否能承受第二次澆注梁的施工荷載及自重。,,,,,,,,,,,,,,,,,,

(1)荷載取值,,,,,,,,,,,,,,,,,,

恒載,,,,,,,,,,,,,,,,,,

模板自重,0.5,×,0.8,=,0.4,KN/m,,,,,,,,,,,,

梁砼自重,24,×,0.8,×,2,=,38.4,KN/m,,,,,,,,,,

鋼筋自重,1.5,×,0.8,×,2,=,2.4,KN/m,,,,,,,,,,

合計(jì)G1K,0.4,+,38.4,+,2.4,=,41.2,KN/m,,,,,,,,,,

活載,,,,,,,,,,,,,,,,,,

施工人員,1,×,0.8,=,0.8,KN/m,,,,,,,,,,,,

振搗,2,×,0.8,=,1.6,KN/m,,,,,,,,,,,,

合計(jì)Q1K,0.8,+,1.6,=,2.4,KN/m,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,KZL35,

(2)荷載組合,,,,,,,,,,,,,,,,,,

由可變荷載控制q1,,=,1.2,×,41.2,+,1.4,×,2.4,=,52.8,KN/m,,,,,,

由永久荷載控制q2,,=,1.35,×,41.2,+,1.4,×,2.4,×,0.7,=,57.972,,KN/m,,,

取q=,57.972,KN/m計(jì)算,,,,,,,,,,,,,,,,

(3)按簡(jiǎn)支梁計(jì)算,,,,,,,,,,,,,,,,,,

,,,q=,57.972,,KN/m,,,,,,,,,,,,

,,,,6.1,,,,,,,,,,,,,,

L取6.1,取b*h=800*800強(qiáng)度等級(jí)取C30,,,,,,,,,,,fc,=,14.3,,,,,

Mmax=,1/8×,57.972,,×,6.1,×,6.1,=,269.642265,,KN·m,,,,,,,

Vmax=,1/2×,57.972,,×,6.1,=,176.8146,,KN,,,,,,,,,

h01=,740,,,,,,,,,,,,,,,,,

按受彎承載力驗(yàn)算,,,,,,,,,,,,,,,,,,

按b×h=,800,×,800,所能承受的極限彎矩M1u>Mmax才能滿足要求;,,,,,,,,,,,,,,

求M1u,查設(shè)計(jì)圖紙,,,,KZL35,,梁底配筋總面積,,,As,=,18463.2,,,mm2,,,,,

矩形截面:,,,,,,,,,,,,,,,,,,

χ=,fyAs,=,360,×,18463.2,,=,581.0097902,,mm,,,,,,,,

,α1fcb,,14.3,×,800,,,,,,,,,,,,,

M1u=α1fcbχ(h01-0.5χ),,,,=,2987.682487,,,KN·m,,>Mmax=,,269.642265,,KN·m,,,,

ξ=,χ,=,581.0097902,=,0.785148365,,>,0.518,,,,,,,,,,

,h01,,740,,,,,,,,,,,,,,,

梁超筋,因梁下有可靠支撐且極限彎矩大于實(shí)際使用彎矩,故不考慮超筋壞。,,,,,,,,,,,,,,,,,,

斜截面受剪承載力驗(yàn)算,,,,,,,,,,,,,,,,,,

(1)驗(yàn)算截面尺寸:,,,0.25βcfcbh01=,,,0.25,×,1,×,14.3,×,800,×,740,=,2116.4,,

>,Vmax=,176.8146,,,KN,,,,,,,,,,,,,

滿足要求,,,,,,,,,,,,,,,,,,

(2)斜截面抗剪,,,,,,,,,,,,,,,,,,

按設(shè)計(jì)圖紙箍筋,,12,@,100,,6,,,,,,,,,,,,

,AsV,=,113.04,,×,6,,=,6.7824,,,,,,,,,

,s,,100,,,,,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范7.5.4-2式,,,,,,,,,,,,,,,,,,

Vc=,0.7ftbh01+1.25fy,,,AsV,,h01,,,,,,,,,,,,

,,,,s,,,,,,,,,,,,,,

=,0.7,×,1.43,×,800,×,740,+,1.25,×,360,×,6.7824,×,740,,,

=,2851.1312,>,Vmax=,176.8146,,KN,,,,,,,,,,,,

疊合面受剪承載力驗(yàn)算,,,,,,,,,砼按C30考慮,,,,,,,,,

查設(shè)計(jì)計(jì)算書(shū)(設(shè)計(jì)提供的彎矩、剪力包絡(luò)圖)Vmax=,,,,,,,,,,,3164,,KN,,,,,

h0=,2000,-,60,=,1940,,,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范10.6.5-1式,,,,,,,,,,,,,,,,,KZL35,

V=1.2ftbh0+0.85fyv,,ASV,h0,=,1.2,×,1.43,×,800,×,1940,+,0.85,×,360,×,6.7824,

,,S,,,,,,,,,,,,,,,,

,,,,,×,1940,,,,,,,,,,,,

,,,,=,6689.535936,,,,>,Vmax=,,3164,,KN,,,,

∴疊合面可不加抗剪短筋,,,,,,,,,,,,,,,,,,

鋼筋應(yīng)力驗(yàn)算,,,,,,,,,,,,,,,,,,

在施工階段:恒載標(biāo)準(zhǔn)值G1k=,,,,,,41.2,,KN/m,,,,,,,,,,

M1Gk=,1/8×G1K×L2,,,=,191.6315,,KN·m,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范10.6.8-3式,,,,,,,,,,,,,,,,,,

σs1k=,M1Gk,,=,191631500,,,,,,,,=,16.12163011,N/mm2,,,,

,0.87Ash01,,,0.87,,×,18463.2,,×,740,,,,,,,,

因,M1Gk,=,191.6315,,<,0.35,,M1u,=,3920.35,,,,,,,,

σs2k=,M2k,,=,8616153846,,,,,,,,=,276.4938579,N/mm2,,,,

,0.87Ash0,,,0.87,,×,18463.2,,×,1940,,,,,,,,

M2k---在正常使用階段的彎矩標(biāo)準(zhǔn)值,查彎矩圖:,,,,,,,,,,,,,,,,,,

M2k=,M/1.3,=,11201,,/,1.3,,=,8616.153846,,KN·m,,,,,,,

σsk=,σs1k,+,σs2k,=,16.12163011,+,276.4938579,=,292.615488,<,0.9,×,360,=,324,,,

滿足要求,,,,,,,,,,,,,,,,,,

施工階段h1高度梁最大裂縫驗(yàn)算,,,,,,,,,,,,,,,,,,

砼強(qiáng)度按C30,,ftk=,,2.01,,N/mm2,,,HRB400,,Es=,200000,,N,/mm2,,,

保護(hù)層厚度C=,,25,,鋼筋直徑d,,,28,,,,,,,,,,,

M1k=,M1Gk,+,M1Qk,=,202.7945,,KN·m,,,,,,,,,,,

按混凝土設(shè)計(jì)規(guī)范8.1.2-4式:,,,,,,,,,,,,,,,,,,

ρtel=,As,=,18463.2,,,,,=,0.0576975,,,,,,,,,

,0.5bh1,,0.5,×,800,×,800,,,,,,,,,,,

按混凝土設(shè)計(jì)規(guī)范8.1.3-3式:,,,,,,,,,,,,,,,,,,

δ1k=,M1K,,=,202794500,,,,,,,,=,17.06075419,,,,,

,0.87h01As,,,0.87,,×,740,,×,18463.2,,,,,,,,

按混凝土設(shè)計(jì)規(guī)范8.1.2-2式:,,,,,,,,,,,,,,,,,,

φ=,1.1-0.65,,ftk,,,=,1.1,-,0.65,2.01,,,,=,-0.227254457,,<,0.2

,,,ρtel×δ1k,,,,,,,0.0576975,,×,17.06075419,,,,,

取φ=,0.2,,,,,,,,,,,,,,,,,

裂縫寬度:,,,,,,,,,,,,,,,,,,

Wmax=,αcrφ,δ1k,,(1.9C,,+,0.08,d,,),,,,,,,,

,,Es,,,,,,ρtel,,,,,,,,,,

=,2.1,×,0.2,×,17.06075419,,,×,(,1.9,×,25,+,0.08,×,28,,)

,,,,,200000,,,,,,,,,,,0.0576975,,

=,0.003092751,<,0.2,mm,,,,,,,,,,,,,,

滿足要求,,,,,,,,,,,,,,,,,,

梁下支撐在轉(zhuǎn)換層施工期間不拆除,梁撓度不必進(jìn)行驗(yàn)算,滿足要求。,,,,,,,,,,,,,,,,,,

6、以梁,,KZL22,,為計(jì)算依據(jù),,,,第一次澆注高度:,,,,1400,",第二次澆注高度",,,,1000,,

砼強(qiáng)度達(dá)到設(shè)計(jì)強(qiáng)度的70%*C45=C30,再進(jìn)行上部施工。鋼筋配筋按原設(shè)計(jì)圖。,,,,,,,,,,,,,,,,,KZL35,

設(shè)計(jì)梁截面,,b=,1000,,h=,2400,,,,,,,,,,,,

在施工過(guò)程中梁下支撐只考慮疊合梁下部h1高度內(nèi)荷載,上部高度h2的自重和施工荷載,,,,,,,,,,,,,,,,,,

由第一次澆注的h1高度來(lái)承受,故按施工階段不加支撐的疊合梁受彎構(gòu)建計(jì)算,即b*h1=1000*1400,,,,,,,,,,,,,,,,,,

的簡(jiǎn)支梁計(jì)算。驗(yàn)算該梁是否能承受第二次澆注梁的施工荷載及自重。,,,,,,,,,,,,,,,,,,

(1)荷載取值,,,,,,,,,,,,,,,,,,

恒載,,,,,,,,,,,,,,,,,,

模板自重,0.5,×,1,=,0.5,KN/m,,,,,,,,,,,,

梁砼自重,24,×,1,×,2.4,=,57.6,KN/m,,,,,,,,,,

鋼筋自重,1.5,×,1,×,2.4,=,3.6,KN/m,,,,,,,,,,

合計(jì)G1K,0.5,+,57.6,+,3.6,=,61.7,KN/m,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,

活載,,,,,,,,,,,,,,,,,,

施工人員,1,×,1,=,1,KN/m,,,,,,,,,,,,

振搗,2,×,1,=,2,KN/m,,,,,,,,,,,,

合計(jì)Q1K,1,+,2,=,3,KN/m,,,,,,,,,,,,

(2)荷載組合,,,,,,,,,,,,,,,,,,

由可變荷載控制q1,,=,1.2,×,61.7,+,1.4,×,3,=,78.24,KN/m,,,,,,

由永久荷載控制q2,,=,1.35,×,61.7,+,1.4,×,3,×,0.7,=,86.235,KN/m,,,,

取q=,86.235,KN/m計(jì)算,,,,,,,,,,,,,,,,

(3)按簡(jiǎn)支梁計(jì)算,,,,,,,,,,,,,,,,,,

,,,q=,86.235,,KN/m,,,,,,,,,,,,

,,,,6.4,,,,,,,,,,,,,,

L取6.4,取b*h=1000*1400強(qiáng)度等級(jí)取C30,,,,,,,,,,,fc,=,14.3,,,,,

Mmax=,1/8×,86.235,,×,6.4,×,6.4,=,441.5232,,KN·m,,,,,,,

Vmax=,1/2×,86.235,,×,6.4,=,275.952,,KN,,,,,,,,,

h01=,1340,,,,,,,,,,,,,,,,,

按受彎承載力驗(yàn)算,,,,,,,,,,,,,,,,,,

按b×h=,1000,×,1400,所能承受的極限彎矩M1u>Mmax才能滿足要求;,,,,,,,,,,,,,,

求M1u,查設(shè)計(jì)圖紙,,,,KZL22,梁底配筋總面積,,,,As,=,4906.25,,,mm2,,,,,

矩形截面:,,,,,,,,,,,,,,,,,,

χ=,fyAs,=,360,×,4906.25,,=,123.513986,,mm,,,,,,,,

,α1fcb,,14.3,×,1000,,,,,,,,,,,,,

M1u=α1fcbχ(h01-0.5χ),,,,=,2257.696711,,,KN·m,,>Mmax=,,441.5232,,KN·m,,,,

ξ=,χ,=,123.513986,=,0.092174616,,<,0.518,,,,,,,,,,

,h01,,1340,,,,,,,,,,,,,,,

斜截面受剪承載力驗(yàn)算,,,,,,,,,,,,,,,,,,

(1)驗(yàn)算截面尺寸:,,,0.25βcfcbh01=,,,0.25,×,1,×,14.3,×,1000,×,1340,=,4790.5,,

>,Vmax=,275.952,,,KN,,,,,,,,,,,,,

滿足要求,,,,,,,,,,,,,,,,,KZL22,

(2)斜截面抗剪,,,,,,,,,,,,,,,,,,

按設(shè)計(jì)圖紙箍筋,,12,@,100,,6,,,,,,,,,,,,

,AsV,=,113.04,,×,6,=,6.7824,,,,,,,,,,

,s,,100,,,,,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范7.5.4-2式,,,,,,,,,,,,,,,,,,

Vc=,0.7ftbh01+1.25fy,,,AsV,,h01,,,,,,,,,,,,

,,,,s,,,,,,,,,,,,,,

=,0.7,×,1.43,×,1000,×,1340,+,1.25,×,360,×,6.7824,×,1340,,,

=,5431.1272,>,Vmax=,275.952,,KN,,,,,,,,,,,,

疊合面受剪承載力驗(yàn)算,,,,,,,,,砼按C30考慮,,,,,,,,,

查設(shè)計(jì)計(jì)算書(shū)(設(shè)計(jì)提供的彎矩、剪力包絡(luò)圖)Vmax=,,,,,,,,,,,10030,,KN,,,,,

h0=,2400,-,60,=,2340,,,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范10.6.5-1式,,,,,,,,,,,,,,,,,,

V=1.2ftbh0+0.85fyv,,ASV,h0,=,1.2,×,1.43,×,1000,×,2340,+,0.85,×,360,×,6.7824,

,,S,,,,,,,,,,,,,,,,

,,,,,×,2340,,,,,,,,,,,,

,,,,=,8871.909696,,,,>,Vmax=,,10030,,KN,,,,

∴疊合面加抗剪短筋,,,3,,12,@,100,,,,,,,,,,,

鋼筋應(yīng)力驗(yàn)算,,,,,,,,,,,,,,,,,,

在施工階段:恒載標(biāo)準(zhǔn)值G1k=,,,,,,61.7,,KN/m,,,,,,,,,,

M1Gk=,1/8×G1K×L2,,,=,315.904,,KN·m,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范10.6.8-3式,,,,,,,,,,,,,,,,,,

σs1k=,M1Gk,,=,315904000,,,,,,,,=,55.2308084,N/mm2,,,,

,0.87Ash01,,,0.87,,×,4906.25,,×,1340,,,,,,,,

因,M1Gk,=,315.904,,<,0.35,,M1u,=,811.65,,,,,,,,

σs2k=,M2k,,=,1783846154,,,,,,,,=,178.5963637,N/mm2,,,,

,0.87Ash01,,,0.87,,×,4906.25,,×,2340,,,,,,,,

M2k---在正常使用階段的彎矩標(biāo)準(zhǔn)值,查彎矩圖:,,,,,,,,,,,,,,,,,,

M2k=,M/1.3,=,2319,,/,1.3,,=,1783.846154,,KN·m,,,,,,,

σsk=,σs1k,+,σs2k,=,55.2308084,+,178.5963637,=,233.8271721,<,0.9,×,360,=,324,,,

滿足要求,,,,,,,,,,,,,,,,,,

施工階段h1高度梁最大裂縫驗(yàn)算,,,,,,,,,,,,,,,,,,

砼強(qiáng)度按C30,,ftk=,,2.01,,N/mm2,,,HRB400,,Es=,200000,,N,/mm2,,,

保護(hù)層厚度C=,,25,,鋼筋直徑d,,,25,,,,,,,,,,,

M1k=,M1Gk,+,M1Qk,=,331.264,,KN·m,,,,,,,,,,,

按混凝土設(shè)計(jì)規(guī)范8.1.2-4式:,,,,,,,,,,,,,,,,,,

ρte=,As,=,4906.25,,,,,=,0.007008929,,,,,,,,,

,0.5bh1,,0.5,×,1000,×,1400,,,,,,,,,,,

按混凝土設(shè)計(jì)規(guī)范8.1.3-3式:,,,,,,,,,,,,,,,,,,

δ1k=,M1K,,=,331.264,,,,,,,,=,57.916261,,,,,

,0.87h01As,,,0.87,,×,1340,,×,4906.25,,,,,,,KZL22,

按混凝土設(shè)計(jì)規(guī)范8.1.2-2式:,,,,,,,,,,,,,,,,,,

φ=,1.1-0.65,,ftk,,,=,1.1,-,0.65,2.01,,,,=,-2.118527791,,<,0.2

,,,ρte×δ1k,,,,,,,0.007008929,,×,57.916261,,,,,

取φ=,0.2,,,,,,,,,,,,,,,,,

裂縫寬度:,,,,,,,,,,,,,,,,,,

Wmax=,αcrφ,δ1k,,(1.9C,,+,0.08,d,,),,,,,,,,

,,Es,,,,,,ρte,,,,,,,,,,

=,2.1,×,0.2,×,57.916261,,,×,(,1.9,×,25,+,0.08,×,25,,)

,,,,,200000,,,,,,,,,,,0.007008929,,

=,0.040482636,<,0.2,mm,,,,,,,,,,,,,,

滿足要求,,,,,,,,,,,,,,,,,,

梁下支撐在轉(zhuǎn)換層施工期間不拆除,梁撓度不必進(jìn)行驗(yàn)算,滿足要求。,,,,,,,,,,,,,,,,,,

7、以大梁KZL18(2)800*2200為計(jì)算依據(jù),第一次澆注高度,,,,,,,,,,,1200,",第二次澆注高度",,,,1000,,

砼強(qiáng)度達(dá)到設(shè)計(jì)強(qiáng)度的70%*C45=C30,再進(jìn)行上部施工。鋼筋配筋按原設(shè)計(jì)圖。,,,,,,,,,,,,,,,,,,

設(shè)計(jì)梁截面,,b=,800,,h=,2200,,,,,,,,,,,,

在施工過(guò)程中梁下支撐只考慮疊合梁下部h1高度內(nèi)荷載,上部高度h2的自重和施工荷載,,,,,,,,,,,,,,,,,,

由第一次澆注的h1高度來(lái)承受,故按施工階段不加支撐的疊合梁受彎構(gòu)建計(jì)算,即b*h1=800*1200,,,,,,,,,,,,,,,,,,

的簡(jiǎn)支梁計(jì)算。驗(yàn)算該梁是否能承受第二次澆注梁的施工荷載及自重。,,,,,,,,,,,,,,,,,,

(1)荷載取值,,,,,,,,,,,,,,,,,,

恒載,,,,,,,,,,,,,,,,,,

模板自重,0.5,×,0.8,=,0.4,KN/m,,,,,,,,,,,,

梁砼自重,24,×,0.8,×,2.2,=,42.24,KN/m,,,,,,,,,,

鋼筋自重,1.5,×,0.8,×,2.2,=,2.64,KN/m,,,,,,,,,,

合計(jì)G1K,0.4,+,42.24,+,2.64,=,45.28,KN/m,,,,,,,,,,

活載,,,,,,,,,,,,,,,,,,

施工人員,1,×,0.8,=,0.8,KN/m,,,,,,,,,,,,

振搗,2,×,0.8,=,1.6,KN/m,,,,,,,,,,,,

合計(jì)Q1K,0.8,+,1.6,=,2.4,KN/m,,,,,,,,,,,,

(2)荷載組合,,,,,,,,,,,,,,,,,,

由可變荷載控制q1,,=,1.2,×,45.28,+,1.4,×,2.4,=,57.696,KN/m,,,,,,

由永久荷載控制q2,,=,1.35,×,45.28,+,1.4,×,2.4,×,0.7,=,63.48,KN/m,,,,

取q=,63.48,KN/m計(jì)算,,,,,,,,,,,,,,,,

(3)按簡(jiǎn)支梁計(jì)算,,,,,,,,,,,,,,,,,,

,,,q=,63.48,,KN/m,,,,,,,,,,,,

,,,,5.2,,,,,,,,,,,,,,

L取5.2,取b*h=800*1200強(qiáng)度等級(jí)取C30,,,,,,,,,,,fc,=,14.3,,,,,

Mmax=,1/8×,63.48,,×,5.2,×,5.2,=,214.5624,,KN·m,,,,,,,

Vmax=,1/2×,63.48,,×,5.2,=,165.048,,KN,,,,,,,,,

h01=,1140,,,,,,,,,,,,,,,,,

按受彎承載力驗(yàn)算,,,,,,,,,,,,,,,,,KZL18,

按b×h=,800,×,1200,所能承受的極限彎矩M1u>Mmax才能滿足要求;,,,,,,,,,,,,,,

求M1u,查設(shè)計(jì)圖紙,,,,KZL18,,梁底配筋總面積,,,,As,=,9847.04,,mm2,,,,,

矩形截面:,,,,,,,,,,,,,,,,,,

χ=,fyAs,=,360,×,9847.04,,=,309.8718881,,mm,,,,,,,,

,α1fcb,,14.3,×,800,,,,,,,,,,,,,

M1u=α1fcbχ(h01-0.5χ),,,,=,3491.987458,,,KN·m,,>Mmax=,,214.5624,,KN·m,,,,

ξ=,χ,=,309.8718881,=,0.271817446,,<,0.518,,,,,,,,,,

,h01,,1140,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,

斜截面受剪承載力驗(yàn)算,,,,,,,,,,,,,,,,,,

(1)驗(yàn)算截面尺寸:,,,0.25βcfcbh01=,,,0.25,×,1,×,14.3,×,800,×,1140,=,3260.4,,

>,Vmax=,165.048,,,KN,,,,,,,,,,,,,

滿足要求,,,,,,,,,,,,,,,,,,

(2)斜截面抗剪,,,,,,,,,,,,,,,,,,

按設(shè)計(jì)圖紙箍筋,,14,@,100,,6,,,,,,,,,,,,

,AsV,=,153.86,,×,6,,=,9.2316,,,,,,,,,

,s,,100,,,,,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范7.5.4-2式,,,,,,,,,,,,,,,,,,

Vc=,0.7ftbh01+1.25fy,,,AsV,,h01,,,,,,,,,,,,

,,,,s,,,,,,,,,,,,,,

=,0.7,×,1.43,×,800,×,1140,+,1.25,×,360,×,9.2316,×,1140,,,

=,5648.7228,>,Vmax=,165.048,,KN,,,,,,,,,,,,

疊合面受剪承載力驗(yàn)算,,,,,,,,,砼按C30考慮,,,,,,,,,

查設(shè)計(jì)計(jì)算書(shū)(設(shè)計(jì)提供的彎矩、剪力包絡(luò)圖)Vmax=,,,,,,,,,,,7462,,KN,,,,,

h0=,2200,-,60,=,2140,,,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范10.6.5-1式,,,,,,,,,,,,,,,,,,

V=1.2ftbh0+0.85fyv,,ASV,h0,=,1.2,×,1.43,×,800,×,2140,+,0.85,×,360,×,9.2316,

,,S,,,,,,,,,,,,,,,,

,,,,,×,2140,,,,,,,,,,,,

,,,,=,8983.012944,,,,>,Vmax=,,7462,,KN,,,,

∴疊合面可不加抗剪短筋,,,,,,,,,,,,,,,,,,

鋼筋應(yīng)力驗(yàn)算,,,,,,,,,,,,,,,,,,

在施工階段:恒載標(biāo)準(zhǔn)值G1k=,,,,,,45.28,,KN/m,,,,,,,,,,

M1Gk=,1/8×G1K×L2,,,=,153.0464,,KN·m,,,,,,,,,,,

按混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范10.6.8-3式,,,,,,,,,,,,,,,,,,

σs1k=,M1Gk,,=,153046400,,,,,,,,=,15.67087738,N/mm2,,,,

,0.87Ash01,,,0.87,,×,9847.04,,×,1140,,,,,,,,

因,M1Gk,=,153.0464,,<,0.35,,M1u,=,1222.19561,,,,,,,,

σs2k=,M2k,,=,4577692308,,,,,,,,=,249.6938639,N/mm2,,,,

,0.87As

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