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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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