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某商業(yè)在興建單層購(gòu)物超市,建筑總面積約7000~9000平方米,柱網(wǎng)間距1.2m3701.2m以上為壓型鋼板保規(guī)范》(GB50017-2003)分別設(shè)計(jì)兩套方案,以進(jìn)行比較。準(zhǔn)凍融深度為1.3~1.5m。0.8~1.2m2.5m深的亞粘土;再往下170kN/m225kN/m3。 :跨梁的跨度L=33m.大的值b=300mm.截面截面截面h=(1/15~1/20)H=400mm~533mm,采用變截面設(shè)計(jì),綜合考慮強(qiáng)度和撓度限制,柱底端小截面h=450mm,柱頂端h=880mm.取----高(即基礎(chǔ)頂面標(biāo)高)為?0.3?1.0+0.5=?0.8m。屋面恒載標(biāo)準(zhǔn)值:0.55恒載標(biāo)準(zhǔn)值:0.45Kn/m2一道主承重剛架柱分擔(dān)的荷載標(biāo)準(zhǔn)值:0.45×7=3.15由于外墻標(biāo)高1.2m以下為磚墻,恒載不由主剛架承受。故主剛架兩側(cè)柱受恒載的位置在標(biāo)高1.2m以上,即在計(jì)算模型中剛架兩側(cè)柱底端2m的屋面活荷載標(biāo)準(zhǔn)值:0.40????=(1)基本風(fēng)壓:??0==風(fēng)壓高度變化系數(shù)本建筑為在興建的單層購(gòu)物超市,應(yīng)屬于“有密集建筑群的城市市區(qū)”,C9.675m15m,故風(fēng)壓高度變化系數(shù)????=0.65風(fēng)載體型系數(shù)根據(jù)????=??????????????0????1.2m高度以下采用磚墻砌筑,可認(rèn)為風(fēng)荷載直接通過(guò)磚墻傳遞至基礎(chǔ)而不作用于鋼結(jié)構(gòu)部分。因此,對(duì)應(yīng)的風(fēng)荷載僅僅標(biāo)高1.2m以上的部位受力,相應(yīng)于計(jì)算模型中,不考慮立柱最下方2m的風(fēng)荷載。=

=1.5?=6.2>2.0,故取????=

=????,??=????,??×??0=1.2????=??????0=0.60????,??=1.2????/??2×7m=????=0.60????/??2×7m=1.2×恒載+1.4×屋面活載+1.4×0.61.2×恒載+1.4×風(fēng)荷載+1.4×0.71.2×恒載+1.4×雪荷載+1.4×0.61.35×恒載+1.4×0.71.35×恒載+1.4×0.61.35×恒載+1.4×0.71.35×恒載+1.4×0.7屋面活載+1.4×0.61.35×恒載+1.4×0.6風(fēng)荷載+1.4×0.7恒載+屋面活載+0.6恒載+風(fēng)荷載+0.7恒載+風(fēng)荷載+0.7恒載+雪荷載+0.6剛架斜梁有吊頂位移值限值,得L/240=137.5mm;求的137.5mm,因此滿足要求。制荷載組合,不考慮以風(fēng)荷載為主的組合,即組合3,4,5,8,9,10。在不同時(shí)考慮屋面活載和雪荷載的情況下,取雪荷載的組合,即不考慮組合1,2,11,14。此不考慮恒荷載起控制作用的荷載組合,即組合12,13,15。軸壓力剪力1-0荷載組合-0荷載組合-02-荷載組合-荷載組合-3--荷載組合--荷載組合--4-荷載組合-荷載組合-5荷載組合荷載組合6荷載組合荷載組合7-荷載組合-荷載組合-8-荷載組合-荷載組合90荷載組合0荷載組合000荷載組合00荷載組合00-0-邊柱小截面受壓翼緣板自由外伸寬度b與厚度t比值??1=117=9.75< = 邊柱大截面受壓翼緣板自由外伸寬度b與厚度t比值??2=117=9.75< = 邊柱小截面腹板寬厚比???1=426=26.625<250√235/??= 邊柱大截面腹板寬厚比???2=856=53.5<250√235/??= Vτ??

=16×426=??Nσ= ??????=√??2+3??2=29.32??????<截面2對(duì)應(yīng)的內(nèi)力:Vτ N

16×

=σ=A+??

=????????=√??2+3??2=171.26??????<截面1正應(yīng)力:

??1=??==???? =√(1+??)2+0.112(1???)2+(1+????

板邊最大應(yīng)力??1<??時(shí),計(jì)算????可以用??????1代替????,Q235鋼????=????

=0.1134<

??1=??+??=

??2=???

=β =????

√(1+??)2+0.112(1???)2+(1+

=???? =0.4121<????=??????? =8000=

????=5.34+4

)2=

???? =0.31<??′= ????=?????′=426×16×125=????<

????

??′=

=0.623<????=?????′=856×16×125=????<2為壓彎構(gòu)件,全截面有效,因此??????????????,且V0.5????????=??????????=918.05kN· 彎矩設(shè)計(jì)值M=756.62kN·m<?????0=?0=??=√1+K= 柱荷載190.4kN,中柱荷載351.88kN,長(zhǎng)度系數(shù):

2×????=√??

???2× × = ??=√1

=?0=???????=?0??=對(duì)于有側(cè)移剛架柱,??????=構(gòu)件長(zhǎng)細(xì)比λ=157.31,c類截面,查得受壓穩(wěn)定系數(shù)??????=

=

+[1?(?? =???? 小于f=215MPa,應(yīng)力比0.997??=1

??+0.75 2=

長(zhǎng)細(xì)比λ=74.97,d類截面,查得受壓穩(wěn)定系數(shù)????=0.61???=???=????0=3.14×????0=????0 ????0=49.49????√√楔率γ=

1=8801=0.956????=1+0.023γ√???0?????=????=1+0.00385γ√???????0=????0

=??0 ?? 2??0 ×00√(??)+ ) )=3.8156>

??′=1.07? =

??

+??′

=?? 小于f=215MPa0.770.8,但是由于平面內(nèi)穩(wěn)定驗(yàn)算中,穩(wěn)定應(yīng)力比達(dá)到了σ==中柱計(jì)算長(zhǎng)度l=9650mm,長(zhǎng)細(xì)比λ=

=C類截面,查表得????=

σ

=軸壓力剪力3--截面4-截面5截面6截面7-截面8-截面90截面3,由于截面5的內(nèi)力更大,因此對(duì)截面5進(jìn)行驗(yàn)算即可。截面截面截面截面受壓翼緣板自由外伸寬度b與厚度t比值??1=145=12.08< = 1腹板寬厚比???1=896=89.6<250√235/??= 2腹板寬厚比???2=1076=107.6<250√235/??= 3腹板寬厚比???3=756=75.6<250√235/??= Vτ N

10×

=σ ??

=????????=√??2+3??2=172.96??????<截面5對(duì)應(yīng)的內(nèi)力:

VτN

=10×

=σ ??

=????????=√??2+3??2=140.23??????<截面7對(duì)應(yīng)的內(nèi)力: τ= = =

10× σ ??

=????????=√??2+3??2=191.06??????< ??1=??+??=

??2=???

=β =????

=√(1+??)2+0.112(1???)2+(1+????板邊最大應(yīng)力??1<??時(shí),計(jì)算????可以用??????1代替????,Q235鋼????=????

=0.777<

??1=??+??=

??2=???

=β =????

=√(1+??)2+0.112(1???)2+(1+???? =0.628<

??1=??+??=

??2=???

=β =????

=√(1+??)2+0.112(1???)2+(1+???? =0.478<故有效寬度系數(shù)ρ1,腹板全截面有效。可以得到截面3/5/7均為全截面有效。斜梁為變截面構(gòu)件,最大腹板高度變化率為(1100780)mm?8??40mm/m60mm/m,????=???????勁肋間距和檁條間距相等,a=1.5m。 =1500= ??=5.34+

)2= ????

=0.931>??′=[1?0.64(??? =

????=

????′=896×10×114.52=????<

=1500= ????=5.34+4 2=??( ????? =0.810>??′=[1?0.64(??? =

????=

????′=756×10×124.16=????<

=????=5.34+4

2=

???? =1.069>0.8<??′=[1?0.64(??? =

????=

????′=1076×10×103.47=????<3全截面有效,因此??????????????,且V0.5????????=??????????=930.13kN· 彎矩設(shè)計(jì)值M756.62kN·m<????6全截面有效,因此??????????????,且V0.5????????=??????????=759.98kN· 彎矩設(shè)計(jì)值M=511.68kN·m<????7全截面有效,因此??????????????,且V0.5????????=??????????=1204.92kN· 彎矩設(shè)計(jì)值M1106.25kN·m<????=b×16√235?????=控制其應(yīng)力比在0.8到1.0的范圍,原因有如下亮點(diǎn):斜保證一定的剛度,一是為了控制斜梁撓度不超過(guò)撓度限值,而是為了保證邊斜梁共由3種類型的變截面段拼接而成,其間段為常截面段。如為保證每個(gè)構(gòu)Q235鋼。開的情況。則螺栓桿預(yù)拉力P=225kN,螺栓孔徑??0=26????,抗滑移系數(shù)μ=0.45。N=203.49kN,V=97kN,M=756.62kN·7.2.2條,當(dāng)內(nèi)力較小時(shí),端板連接應(yīng)按照能夠承受不小于較小被連接截面V=0.5????=每個(gè)高強(qiáng)螺栓抗拉承載力設(shè)計(jì)值????=0.8??=抗剪承載力設(shè)計(jì)值????=0.9??????=0.910.45225= 756.62×103× ????=??Σ??2???=6×(4802+3882+3082+2282+1482+682)

=????=??

= ????+????

+91.125=0.955<對(duì)伸臂類端板,????=40????????=100.72??????=320????,??=205??????,t≥

=對(duì)無(wú)肋端板,a=80mm????=92????,????=43.39??????=320????,??=t≥√= 對(duì)兩邊類端板,????=79.79??????=320????,??=6????t≥ =[??????+2????(????+==τ

=93.46??????<????= 756.62×103× ????=??Σ??2???=6×(4802+3882+3082+2282+1482+682)

=<0.4P=

0.4??

92×

=97.83??????≤??=1.5√??=5.20????≤???≤1.2????==

????=????=215??????,????=

????=A=2×12×(250?2×12)+2×0.7×16×856=????=2.301×????=2×0.7×16×856= ????

= ????

=

????

= )2+??2=Q235鋼。開的情況。則螺栓桿預(yù)拉力P=190kN,螺栓孔徑??0=23.5????,抗滑移系數(shù)μ=0.45。N=351.88kN,V=0kN,M=0kN·7.2.2條,當(dāng)內(nèi)力較小時(shí),短板連接應(yīng)按照能夠承受不小于較小被連接截面

????=V=0.5????=????=690.26kN·M=0.5????=345.13kN·每個(gè)高強(qiáng)螺栓抗拉承載力設(shè)計(jì)值????=0.8??=抗剪承載力設(shè)計(jì)值????=0.9??????=0.910.45190= 345.13×103× ????=??Σ??2???=5×(3582+2832+2082+1332+582)

=????=??

= ????+????

+76.95=0.952<????=40????,????=70????,??=250????,??=對(duì)無(wú)肋端板,a=75mm????=t≥

(0.5??+

=對(duì)兩邊類端板,????= t t [??????+2????(????+節(jié)點(diǎn)域應(yīng)驗(yàn)算剪應(yīng)力。節(jié)點(diǎn)域處:M=1106.25kN·m????=1100????,????=820????,????=τ=??????=122.64??????<????=

???? 345.13×103× ????=??Σ??2???=5×(3582+2832+2082+1332+582)

=54.07kN<=

=70×

=108.57??????≤??=1.5√??=5.20????≤???≤1.2????=取???12????E43型焊條,二級(jí)焊縫。

????=????=215??????,????= ????=A=2×12×(250?2×12)+2×0.7×12×796=????=1.685×????=2×0.7×12×796=

????

= ????

=

????

= )2+??2=采用外伸式端板連接形式,端板豎放,采用Q235M24,10.9級(jí)高強(qiáng)孔徑??0=26????,抗滑移系數(shù)μ=0.45。N=105.54kN,V=184.56kN,M=1106.25kN·每個(gè)高強(qiáng)螺栓抗拉承載力設(shè)計(jì)值????=0.8??=抗剪承載力設(shè)計(jì)值????=0.9??????=0.910.45225= 1106.25×103× ????=??Σ??2???=6×(5852+5032+4232+3432+2632+1832)

=????=??

=

?? ??=0.663< ????=35????,????=70????,??=400????,??=對(duì)伸臂類端板:????=t≥

=對(duì)無(wú)肋端板,a=80mm????=t≥√= 對(duì)兩邊類端板,????= t t [??????+2????(????+ ????=??Σ??2???=80.33<0.4P=

=70×

=128.57??????≤??=1.5√??=5.20????≤???≤1.2????=取???10????E43型焊條,二級(jí)焊縫。

????=????=215??????,????= ????=A=2×12×(300?2×12)+2×0.7×10×1076=????=3.584×????=2×0.7×10×1076=????

=

????

= ????=????=

)2+??2=6780mm。取最大采用外伸式端板連接形式,端板豎放,采用Q235M24,10.9級(jí)高強(qiáng)孔徑??0=26????,抗滑移系數(shù)μ=0.45。N=99.45kN,V=?46.44kN,M=414.95kN·7.2.2條,當(dāng)內(nèi)力較小時(shí),短板連接應(yīng)按照能夠承受不小于較小被連接截面

????=756×10×125=945????V=0.5????=每個(gè)高強(qiáng)螺栓抗拉承載力設(shè)計(jì)值????=0.8??=抗剪承載力設(shè)計(jì)值????=0.9??????=0.910.45225= 414.95×103× ????=??Σ??2???=5×(4252+3432+2632+1832+1032)

=????=??

=23. ????+????

+91.13=0.708<????=35????,????=70????,??=400????,??=對(duì)伸臂類端板:????=t≥

=對(duì)無(wú)肋端板,a=80mm????=t≥√= 對(duì)兩邊類端板,????= t t [??????+2????(????+ 414.95×103× ????=??Σ??2???=5×(4252+3432+2632+1832+1032)

=48.06kN<=

=70×

=128.57??????≤??=1.5√??=5.20????≤???≤1.2????=取???10????E43型焊條,二級(jí)焊縫。

????=????=215??????,????= ????=A=2×12×(300?2×12)+2×0.7×10×756=????=1.566×????=2×0.7×10×756=????

=

????

=

????

= )2+??2=N=96.88kN,V=0kN,M=244.82kN·7.2.2條,當(dāng)內(nèi)力較小時(shí),短板連接應(yīng)按照能夠承受不小于較小被連接截面

????=756×10×125=945????V=0.5????=采用外伸式端板連接形式,端板豎放,采用Q235M24,10.9級(jí)高強(qiáng)孔徑??0=26????,抗滑移系數(shù)μ=0.45。N=203.49kN,V=????=

A =取底板寬度Bb2c250230310mm30mm,削弱面積取30mm×45mm,底板所需長(zhǎng)度為:21196.88+2×30×L= =按構(gòu)造要求,取L=h2c=450230=

=q= 510×310?2×30×45查表得:β=

147,126,1/145 3=2243·/c= 2=589.26??·??3=2

????????=8243.9??·????,f=t=

=栓直徑選擇24mm,采螺帽,對(duì)稱布置。凝土基礎(chǔ)間的摩擦力(摩擦系數(shù)可取0.4)或設(shè)置抗剪鍵承受。最大接觸摩擦力為μN(yùn)0.4203.49kN81.40kN97Kn,故應(yīng)設(shè)置抗剪鍵??辜翩I材料為Q235的I14工字鋼,延伸至基礎(chǔ)150mm,其抗剪承載力為:V=215×121.8×5.5×10?3=1.5√??=5.20????≤???≤1.2????=取???12????E43型焊條,二級(jí)焊縫。

????=????=215??????,????= ????=N=????=

A =取底板寬度Bb2c250230310mm30mm,削弱面積取30mm×45mm,底板所需長(zhǎng)度為:36654.17+2×30×L= =126.95????按構(gòu)造要求,取L=h2c=820230=

=q880×310?2×30×查表得:β=

149,196,1/187 3=22621·/c= 2=586.25??·??3=2

????????=7262.81??·????,f=t=

=栓直徑選擇24mm,采螺帽,對(duì)稱布置。凝土基礎(chǔ)間的摩擦力(摩擦系數(shù)可取0.4)或設(shè)置抗剪鍵承受。最大接觸摩擦力為μN(yùn)0.4351.88kN=1.5√??=5.20????≤???≤1.2????=取???12????E43型焊條,二級(jí)焊縫。

????=????=215??????,????= ????=跨梁的跨度L=33m.312分別為梁邊柱端和中柱端承受負(fù)彎矩大的值b=300mm.截面截面截面h=(1/15~1/20)H=400mm~533mm,采用變截面設(shè)計(jì),綜合考慮強(qiáng)度和撓度限制,柱底端小截面h=400mm,柱頂端h=840mm.截面截面截面888高(即基礎(chǔ)頂面標(biāo)高)為?0.3?1.0+0.5=?0.8m。13屋面恒載標(biāo)準(zhǔn)值:0.55恒載標(biāo)準(zhǔn)值:0.45Kn/m2一道主承重剛架柱分擔(dān)的荷載標(biāo)準(zhǔn)值:0.45×7=3.15由于外墻標(biāo)高1.2m以下為磚墻,恒載不由主剛架承受。故主剛架兩側(cè)柱受恒載的位置在標(biāo)高1.2m以上,即在計(jì)算模型中剛架兩側(cè)柱底端2m的屋面活荷載標(biāo)準(zhǔn)值:0.40????=(1)基本風(fēng)壓:??0==風(fēng)壓高度變化系數(shù)本建筑為在興建的單層購(gòu)物超市,應(yīng)屬于“有密集建筑群的城市市區(qū)”,C9.675m15m,故風(fēng)壓高度變化系數(shù)????=0.65風(fēng)載體型系數(shù)根據(jù)????=??????????????0????1.2m高度以下采用磚墻砌筑,可認(rèn)為風(fēng)荷載直接通過(guò)磚墻傳遞至基礎(chǔ)而不作用于鋼結(jié)構(gòu)部分。因此,對(duì)應(yīng)的風(fēng)荷載僅僅標(biāo)高1.2m以上的部位受力,相應(yīng)于計(jì)算模型中,不考慮立柱最下方2m的風(fēng)荷載。=

=1.5?=6.2>2.0,故取????=

=????,??=????,??×??0=1.2????=??????0=0.60????,??=1.2????/??2×7m=????=0.60????/??2×7m=1.2×恒載+1.4×屋面活載+1.4×0.61.2×恒載+1.4×風(fēng)荷載+1.4×0.71.2×恒載+1.4×雪荷載+1.4×0.61.35×恒載+1.4×0.71.35×恒載+1.4×0.61.35×恒載+1.4×0.71.35×恒載+1.4×0.7屋面活載+1.4×0.61.35×恒載+1.4×0.6風(fēng)荷載+1.4×0.7恒載+屋面活載+0.6恒載+風(fēng)荷載+0.7恒載+風(fēng)荷載+0.7恒載+雪荷載+0.64.2kN/m3.85kN/m,故撓度限值為L(zhǎng)/400=82.5mm。制荷載組合,不考慮以風(fēng)荷載為主的組合,即組合3,4,5,8,9,10。在不同時(shí)考慮屋面活載和雪荷載的情況下,取雪荷載的組合,即不考慮組合1,2,11,14。此不考慮恒荷載起控制作用的荷載組合,即組合12,13,15。軸壓力剪力1-0荷載組合-0荷載組合-02-荷載組合-荷載組合-3--荷載組合--荷載組合--4-荷載組合-荷載組合-5荷載組合荷載組合6荷載組合荷載組合7-荷載組合-荷載組合-8-荷載組合-荷載組合90荷載組合0荷載組合000荷載組合00荷載組合00--0--(230?8)?(2×12)=9.25< τ= = = 8×Nσ= ??????=√??2+3??2=44.30??????<截面2對(duì)應(yīng)的內(nèi)力: τ= = = 8× σ ??

=????????=√??2+3??2=172.79??????<?0=?0=

??=√1

K= 柱荷載180.66kN,中柱荷載361.62kN,長(zhǎng)度系數(shù):

2×????=√??

???2× × = ??=√1

=?0=???????=?0??=對(duì)于有側(cè)移剛架柱,無(wú)橫向荷載作用1??????=0.65+0.35??,??2=0,??????=1構(gòu)件長(zhǎng)細(xì)比λ=143.70,c類截面,查得受壓穩(wěn)定系數(shù)??????= = 穩(wěn)

驗(yàn)算′

[1?0.8(?? )]??

=173.83??????<??=???? 小于f=215MPa,應(yīng)力比0.809

+????????????≤1??????=0.65+0.35??,??2=0,??????=1工形截面,截面影響系數(shù)??=長(zhǎng)細(xì)比λ=66.71,d類截面,查得受壓穩(wěn)定系數(shù)????=0.664。

??=1.07

=

+????????????=131.55??????≤??=全截面自由外伸寬厚比??1=111=9.25<15√235/??= ??

????????

????=0,λ=max )=

???=47<

0+0.5??+25)

=????????? ??????0 =1.833,λ=max(????,????)=???=102<(48??+0.5???26.2)235=

σ==中柱計(jì)算長(zhǎng)度l=9650mm,長(zhǎng)細(xì)比λ=

=C類截面,查表得????=

σ

=軸壓力剪力3--截面4截面5截面60截面3,由于截面5的內(nèi)力更大,因此對(duì)截面5進(jìn)行驗(yàn)算即可。截面截面截面(300?2? =10.36<截面塑性發(fā)展系數(shù)????=Vτ N

10×

=σ ??

=????????=√??2+3??2=173.86??????<截面4對(duì)應(yīng)的內(nèi)力: τ= = = 10× σ ??

=????????=√??2+3??2=115.56??????< τ= = = 10×Nσ=

=??????=√??2+3??2=176.56??????<=b×16√235?????=全截面自由外伸寬厚比??1=10.36<15√235/??=

=61.2<

80<

=99.2<80<????=107.2<加勁肋的布置密度為1000mm,驗(yàn)算:

????=????=??????=215??????,??????=10.9級(jí)高強(qiáng)度螺栓,摩擦型連接,表面噴砂處理,螺栓承受剪力。N=180.66kN,V=?65.8kN,M=513.25kN·根據(jù)《鋼規(guī)》第7.2.2條,當(dāng)內(nèi)力較小時(shí),連接應(yīng)按照能夠承受不小于較小被連接截面承載????=612×10×125=

????=????=215??????,????= A=2×10×230+10×612=????=8.98×????

=199.66??????< 螺栓桿預(yù)拉力P=225kN,螺栓孔徑??0=26????,抗滑移系數(shù)μ0.45。每個(gè)高強(qiáng)螺栓抗拉承載力設(shè)計(jì)值????=0.8??=180????抗剪承載力設(shè)計(jì)值????=0.9??????=0.920.45225182.25???? ??1=??

4

=

??2=??Σ??2

382.5×120×2×(602+1802)= V=√??2+??2=149.37????< t= = =2.64???? 2×580×=節(jié)點(diǎn)域應(yīng)驗(yàn)算剪應(yīng)力。節(jié)點(diǎn)域處:M513.25kN·m????=640????,????=840????,????=τ=????

=119.34??????<3????=

??

????

????+

=????=23.5????,抗滑移系數(shù)μ=0.45。柱頂板和梁下翼緣的螺栓連接采用普通螺栓,只起連接作N=361.62kN,V=0kN,M=0kN·N=74.38kN,V=191.21kN,M=1082.53kN·每個(gè)高強(qiáng)螺栓抗拉承載力設(shè)計(jì)值????=0.8??=抗剪承載力設(shè)計(jì)值????=0.9??????=0.910.45225= 1082.53×103× ????=??Σ??2???=6×(4562+3762+2962+2162+1362+562)

=????=??

= ????+????

+91.125=0.975<????=40????,????=80????,??=460????,??=對(duì)無(wú)肋端板,a=80mm????=t≥√= 對(duì)兩邊類端板,????= t t [??????+2????(????+2 1082.53×103× 2????=??Σ??2???=6×(4562+3762+2962+2162+1362+562)

=>0.4P=

=163.97??????≤??=215??????80×101.5√??=5.61????≤???≤1.2????=取???10????E43型焊條,二級(jí)焊縫。

????=????=205??????,????= ????=A=2×18×(300?2×18)+2×0.7×10×992=????=2.853×????=2×0.7×10×992= ????

=196.66??????< ????

=

????

=???? )+

=136.06??????< 3.8.2.9

N=A=2×28×(230+50×2)=σ =NTn

=

????=????=????????= 焊縫連接,焊腳尺寸為h=14mm,焊縫面積A=0.7×2×14×200=2920????2。V= =180.81kN2

τ= =61.92MPa<160MPaM24,10.9級(jí)高強(qiáng)度螺栓,摩擦型連數(shù)μ=0.45。N=?64.99kN,V=17.96kN,M=645.23kN·????=992×10×125=1240????V=0.5????=620????????=????=215??????,????= A=2×14×300=????=2.13× ????

=162.56??????< P=225kN,螺栓孔徑??026????,抗滑移系數(shù)μ0.45。每個(gè)高強(qiáng)螺栓抗拉承載力設(shè)計(jì)值????=0.8??=180????抗剪承載力設(shè)計(jì)值????=0.9??????=0.920.45225= ??1=??

6

=

620×120× ??2=??Σ??2=2×(602+1802)= V=√??2+??2=109.24????< t= = =2.76???? 2×900×=N=?68.61kN,V=0kN,M=294.28kN·????=992×10×125=1240????V=0.5????=620????屋脊處梁高為N=?195.27kN,V=????=

A =取底板寬度Bb2c230230290mm30mm,削弱面積取30mm×45mm,底板所需長(zhǎng)度為:20340.63+2×30×L= =按構(gòu)造要求,取L=h2c=400230=q =460×290?2×30×查表得:β=

??1=141????,??1=376????,??1/??1=1??3=??????2=8385.27??·1??3

c=1????2=672.3??·2????????=8385.27??·????,f=

t=√6????????=Q235最大接觸摩擦力為μN(yùn)=0.4195.27kN=78.12kN>V=1.5√??=5.20????≤???≤1.2????=N=????=

B×L=404×560,A ??0=2×(50×30+??

2

)≈

????=226240?5000 A =

q=221240=a=111mm,b=b=3.387,α=a查表得:β=

??3=??????2=3335.82??·??1=80????,??1=230????,??1/??1=1??3=??????2=3035.19??·1c= 2=1771.88??·??3=2

????????=3335.82??·????,f=t=√6????????==栓直徑選擇24mm,采螺帽,對(duì)稱布置。???????=4×0.7????=取???????=8120=

????=2×(560?16)+4×(80?16)=0.7??????? 0.7????????截面采用12mm120mm。 ????=2??=??1

1=1.033×2?? 2???=4.673×106??????= ??2

??1=??????1=2=60700.5????=

???????????? 2=162.26??????????????????

=1.5????????=75.88??????<

??

鋼,截面初選為C22075202.5XY--------(1)1.2恒載+1.4(2)1.35恒載+1.4×0.7雪載(3)1.0恒載+1.0組合組合組合用組合1驗(yàn)算構(gòu)件截面承載力,正常使用極限狀態(tài)下用組合3驗(yàn)算結(jié)構(gòu)形變。 2=9.175kN·????=8

????=9??????=8.156????·1????=2??????=錄B截面特性表B.1.1-3槽鋼。

9.175× 0.18×????????

+ = + =157.63MPa

9.175× 0.18×????????

? = ? =

ψ =

=????

=

=?????

=ψ =力作用于部分加勁邊,ψ=0.875k=1.15?0.22ψ+0.045ψ2==?k=7.8?6.29ψ+9.78ψ2==ξ=c =0.598≤ b

??1

=1.293<??′=1α=1.15?0.15ψ=ρ=√205??1??=壓力分布不均勻系數(shù)ψ=????????=0.875≥0,板件受壓區(qū)寬度??=??=

18αρ=23.68

b=30<38αρ=t????=(√ ?0.1)????=

????1=0.4????=????2=0.6????==cξ =1.672>b11

??1=0.11

(???

=0.463<??′=α=1.15(ψ<ρ=√205??1??=壓力分布不均勻系數(shù)ψ=????????=?1.079<0????=1???=b

18αρ=83.91

=88<38αρ=t????=(√ ?0.1)????=腹板為加勁板件,ψ=????????=?1.079<0

????1=0.4????=????2=0.6????=1??????=220?2.5×(7.04×106?9.17×2.5×(110?2.5)2?2.68××(176.06?1101

2.68))=29.17???????????? ×(6.866.×105?9.17×2.5×(39.5?20.7×(20.7 )2)=2

)?2.68×2????????????

9.17×(6.866.×105?9.17×2.5×(26.33?20.7+ )?2.68×

×(50.3 )2)=2σ

+

9.175×=0.18×106+122536

= =30 = =8 板屋面容許撓度為L(zhǎng)/150=46.67mm.5 1.498×v=384 =384×2.06×105×7.038×106=32.30????<????

=

=82.35<

???? =87.72<?? 3×β=

1=

7×F= =A =選用d=25mm,t=1.5mm的焊接薄壁圓,張緊。查表知A=111????2,已經(jīng)滿足強(qiáng)度要求,i=8.3mm,驗(yàn)算長(zhǎng)細(xì)比:

√1.02+(7/3)2×λ= =305.85<[??]= 圓,驗(yàn)算長(zhǎng)細(xì)比:lλ==

=120.48<[??]=

度范圍為6m;剛架間距7m。墻梁跨度為7m>6m,因此需在其跨間三等分點(diǎn)處設(shè)置拉條。采用卷邊槽鋼(C形)墻梁,鋼材選用Q235鋼,截面初選為C180×70×20×2各荷載標(biāo)準(zhǔn)值按照最大間距的墻梁所需承擔(dān)的荷載計(jì)算,最大間距為(3m1m22m,風(fēng)荷載(迎風(fēng)面風(fēng)荷載(背風(fēng)面--(1)1.2恒載+1.4(2)1.35恒載+1.4×0.7風(fēng)載(3)1.0恒載+1.0組合組合組合---13用于驗(yàn)算結(jié)構(gòu)形 2=4.906kN·????=8

????=9??????=4.361????·1????=2??????=跨中正彎矩0.13kN·m,邊跨最大正彎矩0.47kN·m,拉條處負(fù)彎矩?0.58kN·m,最大剪力墻梁截面初選型號(hào)為C18070202,幾何參數(shù)參照《冷彎薄壁型鋼結(jié)構(gòu)技術(shù)規(guī)范》附錄B截面特性表B.1.1-3槽鋼。

4.361×

0.58×????????

+ = + =

4.361× 0.58×????????

? = ? =

ψ =

=????

=

=?????

=ψ =力作用于支承邊,ψ=0.364≥?1k=5.89?11.59ψ+6.68ψ2==?k=7.8?6.29ψ+9.78ψ2==ξ=c =0.841≤ b

??1

=1.090<??′=1α=1.15?0.15ψ=ρ=√205??1??=壓力分布不均勻系數(shù)ψ=????????=0.364≥0,板件受壓區(qū)寬度??=??=

18αρ=39.65

b=t????= ξ ξ =1.069<

??1

1

1=0.967<??′=1α=1.15(ψ<ρ=√205??1??=壓力分布不均勻系數(shù)ψ=????????=?1.079<0????=1???=b

18αρ=198.55????=

=t

????????????=??????????=????????????=??????????=

4.361×

0.58×σ= + = + =176.84??????<215??????

3×????

=8.33??????<125MPa4×68×2 3×????

=2×196×2=10.73MPa<

= =35 a=

> 2=10{<墻梁容許撓度為(水平方向和豎向)L/200,壓型鋼板容許撓度為L(zhǎng)/150=46.67mm5 0.572× v =384×2.06×105×3.44×106=25.23????<200=5??

0.9×(7000 v

3

=3.73????< =11.67????384

2.06×105×0.452× ????

=

=98.87<

???? =90.79<?? 3×由前述計(jì)算,每個(gè)墻梁傳遞給拉條的支座反力為2.77kN。β=

1=

7×F= =21.09????A =選用d=25mm,t=1.5mm的焊接薄壁圓,張緊。查表知A=111????2,已經(jīng)滿足強(qiáng)度要求,i=8.3mm,驗(yàn)算長(zhǎng)細(xì)比:

√1.02+(7/3)2×λ= =305.85<[??]= Q235lλ==

=120.48<[??]==????=基本風(fēng)壓w01.05的系數(shù),??0=1.050.55=0.5775按照上次作業(yè)門規(guī)初算中的取值,有????0.65,????1.0和-1.0,去兩面山墻上的合力,????=2,故等效風(fēng)荷載標(biāo)準(zhǔn)值:????=??????????0=0.75??1=1.4×0.75×0.5 ÷3=2

??2=??3=??4=??5=??6=2??7=最大軸壓力38.15*2=76.3kN,與該水平系桿相連的斜向支撐有最大軸拉力47.96Kn.除屋脊處外的水平剛性系桿采用d=108mm,t=2.5mm的焊接薄壁圓,材料為截面面積A=829????2,回轉(zhuǎn)半徑i=長(zhǎng)細(xì)比λ=l=187.67<[λ]=iB類截面,查表得穩(wěn)定系數(shù)φ

=0.2087×

=199.64??????<屋脊處的水平剛性系桿采用d=140mm,t=3mm的焊接薄壁圓,材料為Q235鋼。截面面積A=1291????2,回轉(zhuǎn)半徑i=48.5mm長(zhǎng)細(xì)比λ=l=144.33<[λ]=iB類截面,查表得穩(wěn)定系數(shù)φ==

0.3280×

=180.19??????<系桿長(zhǎng)l=√8.252+72+(8.25×5%)2=10.83??,截面面

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