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首钢贵钢老区开发棚户区改造项目10-2地块高支模安全专项施工方案-修改后.docxVmax=max[0.625ql1,ql2]=max[0.625×5.192×0.8,5.192×0.2]=2.596kN
τmax=3Vmax/(2bh0)=3×2.596×1000/(2×40×80)=1.217N/mm2≤[τ]=1.232N/mm2
ν1=0.521q'l14/(100EI)=0.521×4.06×8004/(100×7040×170.667×104)=0.721mm≤[ν]=l1/400=800/400=2mm
ν2=q'l24/(8EI)=4.06×2004/(8×7040×170.667×104)=0.068mm≤[ν]=2l2/400=2×200/400=1mm
GTCC-051-2018 铁路数字移动通信系统(GSM-R)模拟光纤直放站 4、支座反力计算
承载能力极限状态
Rmax=max[1.25qL1,0.375qL1+qL2]=max[1.25×5.192×0.8,0.375×5.192×0.8+5.192×0.2]=5.192kN
梁底支撑小梁所受最大支座反力依次为R1=3.766kN,R2=5.192kN,R3=4.252kN,R4=4.252kN,R5=5.192kN,R6=3.766kN
正常使用极限状态
Rmax'=max[1.25q'L1,0.375q'L1+q'L2]=max[1.25×4.06×0.8,0.375×4.06×0.8+4.06×0.2]=4.06kN
梁底支撑小梁所受最大支座反力依次为R1'=2.84kN,R2'=4.06kN,R3'=3.301kN,R4'=3.301kN,R5'=4.06kN,R6'=2.84kN
主梁自重忽略不计,主梁2根合并,其主梁受力不均匀系数=0.6,则单根主梁所受集中力为Ks×Rn,Rn为各小梁所受最大支座反力
主梁弯矩图(kN·m)
σ=Mmax/W=0.191×106/4250=44.928N/mm2≤[f]=205N/mm2
主梁剪力图(kN)
Vmax=2.551kN
τmax=2Vmax/A=2×2.551×1000/398=12.819N/mm2≤[τ]=125N/mm2
主梁变形图(mm)
νmax=0.054mm≤[ν]=L/400=367/400=0.917mm
4、支座反力计算
承载能力极限状态
支座反力依次为R1=0.201kN,R2=7.725kN,R3=7.725kN,R4=0.201kN
立杆所受主梁支座反力依次为P1=0.201/0.6=0.334kN,P2=7.725/0.6=12.876kN,P3=7.725/0.6=12.876kN,P4=0.201/0.6=0.334kN
1、扣件抗滑移验算
两侧立杆最大受力N=max[R1,R4]=max[0.201,0.201]=0.201kN≤0.85×8=6.8kN
单扣件在扭矩达到40~65N·m且无质量缺陷的情况下,单扣件能满足要求!
2、可调托座验算
可调托座最大受力N=max[P2,P3]=12.876kN≤[N]=30kN
顶部立杆段:l01=kμ1(hd+2a)=1×1.427×(750+2×200)=1641mm
非顶部立杆段:l02=kμ2h =1×1.808×1200=2170mm
λ=max[l01,l02]/i=2170/16=135.625≤[λ]=210
长细比满足要求!
Mw=1×φc×1.4×ωk×la×h2/10=1×0.9×1.4×0.362×0.8×1.22/10=0.053kN·m
q1=1×[1.2×(0.1+(24+1.5)×1.15)+1.4×0.9×2]×1=37.83kN/m
同上四~六计算过程,可得:
R1=0.311kN,P2=12.939kN,P3=12.939kN,R4=0.311kN
顶部立杆段:l01=kμ1(hd+2a)=1.155×1.427×(750+2×200)=1895mm
λ1=l01/i=1895.413/16=118.463,查表得,φ1=0.464
f=N/(φA)+Mw/W=12986.899/(0.464×398)+0.053×106/4250=82.795N/mm2≤[f]=205N/mm2
非顶部立杆段:l02=kμ2h =1.155×1.808×1200=2506mm
λ2=l02/i=2505.888/16=156.618,查表得,φ2=0.287
f=N/(φA)+Mw/W=13832.899/(0.287×398)+0.053×106/4250=133.572N/mm2≤[f]=205N/mm2
H/B=5.85/8.4=0.696≤3
满足要求,不需要进行抗倾覆验算 !
十、立杆支承面承载力验算
F1=N=13.833kN
1、受冲切承载力计算
um =2[(a+h0)+(b+h0)]=1520mm
F=(0.7βhft+0.25σpc,m)ηumh0=(0.7×1×1.115+0.25×0)×1×1520×280/1000=332.181kN≥F1=13.833kN
2、局部受压承载力计算
可得:fc=11.154N/mm2,βc=1,
βl=(Ab/Al)1/2=[(a+2b)×(b+2b)/(ab)]1/2=[(300)×(300)/(100×100)]1/2=3,Aln=ab=10000mm2
F=1.35βcβlfcAln=1.35×1×3×11.154×10000/1000=451.737kN≥F1=13.833kN
2、《建筑施工扣件式钢管脚手架安全技术规范》JGJ 130-2011
设计简图如下:
取单位宽度b=1000mm,按四等跨连续梁计算:
W=bh2/6=1000×15×15/6=37500mm3,I=bh3/12=1000×15×15×15/12=281250mm4
q1=0.9×max[1.2(G1k+(G2k+G3k)×h)+1.4Q2k,1.35(G1k+(G2k+G3k)×h)+1.4ψcQ2k]×b=0.9×max[1.2×(0.1+(24+1.5)×2.15)+1.4×2,1.35×(0.1+(24+1.5)×2.15)+1.4×0.7×2]×1=68.498kN/m
q1静=0.9×1.35×[G1k+(G2k+G3k)×h]×b=0.9×1.35×[0.1+(24+1.5)×2.15]×1=66.734kN/m
q1活=0.9×1.4×0.7×Q2k×b=0.9×1.4×0.7×2×1=1.764kN/m
q2=[1×(G1k+(G2k+G3k)×h)]×b=[1×(0.1+(24+1.5)×2.15)]×1=54.925kN/m
计算简图如下:
Mmax=0.107q1静L2+0.121q1活L2=0.107×66.734×0.0672+0.121×1.764×0.0672=0.033kN·m
σ=Mmax/W=0.033×106/37500=0.872N/mm2≤[f]=15N/mm2
νmax=0.632q2L4/(100EI)=0.632×54.925×66.6674/(100×5400×281250)=0.005mm≤[ν]=L/400=66.667/400=0.167mm
3、支座反力计算
设计值(承载能力极限状态)
R1=R5=0.393q1静L+0.446q1活L=0.393×66.734×0.067+0.446×1.764×0.067=1.801kN
R2=R4=1.143q1静L+1.223q1活L=1.143×66.734×0.067+1.223×1.764×0.067=5.229kN
R3=0.928q1静L+1.142q1活L=0.928×66.734×0.067+1.142×1.764×0.067=4.263kN
标准值(正常使用极限状态)
R1'=R5'=0.393q2L=0.393×54.925×0.067=1.439kN
R2'=R4'=1.143q2L=1.143×54.925×0.067=4.185kN
R3'=0.928q2L=0.928×54.925×0.067=3.398kN
承载能力极限状态:
梁底面板传递给左边小梁线荷载:q1左=R1/b=1.801/1=1.801kN/m
梁底面板传递给中间小梁最大线荷载:q1中=Max[R2,R3,R4]/b=Max[5.229,4.263,5.229]/1=5.229kN/m
梁底面板传递给右边小梁线荷载:q1右=R5/b=1.801/1=1.801kN/m
左侧小梁荷载q左=q1左+q2+q3左+q4左 =1.801+0.016+1.124+1.44=4.381kN/m
中间小梁荷载q中= q1中+ q2=5.229+0.016=5.245kN/m
右侧小梁荷载q右=q1右+q2+q3右+q4右 =1.801+0.016+1.124+1.44=4.381kN/m
小梁最大荷载q=Max[q左,q中,q右]=Max[4.381,5.245,4.381]=5.245kN/m
正常使用极限状态:
梁底面板传递给左边小梁线荷载:q1左'=R1'/b=1.439/1=1.439kN/m
梁底面板传递给中间小梁最大线荷载:q1中'=Max[R2',R3',R4']/b=Max[4.185,3.398,4.185]/1=4.185kN/m
梁底面板传递给右边小梁线荷载:q1右'=R5'/b=1.439/1=1.439kN/m
左侧小梁荷载q左'=q1左'+q2'+q3左'+q4左'=1.439+0.013+0.925+1.004=3.381kN/m
中间小梁荷载q中'= q1中'+ q2'=4.185+0.013=4.199kN/m
右侧小梁荷载q右'=q1右'+q2'+q3右'+q4右' =1.439+0.013+0.925+1.004=3.381kN/m
小梁最大荷载q'=Max[q左',q中',q右']=Max[3.381,4.199,3.381]=4.199kN/m
为简化计算,按二等跨连续梁和悬臂梁分别计算,如下图:
Mmax=max[0.125ql12,0.5ql22]=max[0.125×5.245×0.82,0.5×5.245×0.22]=0.42kN·m
σ=Mmax/W=0.42×106/42667=9.834N/mm2≤[f]=11.44N/mm2
Vmax=max[0.625ql1,ql2]=max[0.625×5.245×0.8,5.245×0.2]=2.623kN
τmax=3Vmax/(2bh0)=3×2.623×1000/(2×40×80)=1.229N/mm2≤[τ]=1.232N/mm2
ν1=0.521q'l14/(100EI)=0.521×4.199×8004/(100×7040×170.667×104)=0.746mm≤[ν]=l1/400=800/400=2mm
ν2=q'l24/(8EI)=4.199×2004/(8×7040×170.667×104)=0.07mm≤[ν]=2l2/400=2×200/400=1mm
4、支座反力计算
承载能力极限状态
Rmax=max[1.25qL1,0.375qL1+qL2]=max[1.25×5.245×0.8,0.375×5.245×0.8+5.245×0.2]=5.245kN
梁底支撑小梁所受最大支座反力依次为R1=4.381kN,R2=5.245kN,R3=4.279kN,R4=4.279kN,R5=4.279kN,R6=4.279kN,R7=4.279kN,R8=4.279kN,R9=5.245kN,R10=4.381kN
正常使用极限状态
Rmax'=max[1.25q'L1,0.375q'L1+q'L2]=max[1.25×4.199×0.8,0.375×4.199×0.8+4.199×0.2]=4.199kN
梁底支撑小梁所受最大支座反力依次为R1'=3.381kN,R2'=4.199kN,R3'=3.411kN,R4'=3.411kN,R5'=3.411kN,R6'=3.411kN,R7'=3.411kN,R8'=3.411kN,R9'=4.199kN,R10'=3.381kN
主梁自重忽略不计,主梁2根合并,其主梁受力不均匀系数=0.6,则单根主梁所受集中力为Ks×Rn,Rn为各小梁所受最大支座反力
主梁弯矩图(kN·m)
σ=Mmax/W=0.176×106/4250=41.407N/mm2≤[f]=205N/mm2
主梁剪力图(kN)
Vmax=4.3kN
τmax=2Vmax/A=2×4.3×1000/398=21.609N/mm2≤[τ]=125N/mm2
主梁变形图(mm)
νmax=0.02mm≤[ν]=L/400=220/400=0.55mm
4、支座反力计算
承载能力极限状态
支座反力依次为R1=0.401kN,R2=4.701kN,R3=9.177kN,R4=9.177kN,R5=4.701kN,R6=0.401kN
立杆所受主梁支座反力依次为P1=0.401/0.6=0.668kN,P2=4.701/0.6=7.835kN,P3=9.177/0.6=15.295kN,P4=9.177/0.6=15.295kN,P5=4.701/0.6=7.835kN,P6=0.401/0.6=0.668kN
1、扣件抗滑移验算
两侧立杆最大受力N=max[R1,R6]=max[0.401,0.401]=0.401kN≤0.85×8=6.8kN
单扣件在扭矩达到40~65N·m且无质量缺陷的情况下,单扣件能满足要求!
2、可调托座验算
可调托座最大受力N=max[P2,P3,P4,P5]=15.295kN≤[N]=30kN
顶部立杆段:l01=kμ1(hd+2a)=1×1.427×(750+2×200)=1641mm
非顶部立杆段:l02=kμ2h =1×1.808×1200=2170mm
λ=max[l01,l02]/i=2170/16=135.625≤[λ]=210
长细比满足要求!
Mw=1×φc×1.4×ωk×la×h2/10=1×0.9×1.4×0.362×0.8×1.22/10=0.053kN·m
q1=1×[1.2×(0.1+(24+1.5)×2.15)+1.4×0.9×2]×1=68.43kN/m
同上四~六计算过程,可得:
R1=0.664kN,P2=7.748kN,P3=15.304kN,P4=15.304kN,P5=7.748kN,R6=0.664kN
顶部立杆段:l01=kμ1(hd+2a)=1.155×1.427×(750+2×200)=1895mm
λ1=l01/i=1895.413/16=118.463,查表得,φ1=0.464
f=N/(φA)+Mw/W=15352.037/(0.464×398)+0.053×106/4250=95.602N/mm2≤[f]=205N/mm2
非顶部立杆段:l02=kμ2h =1.155×1.808×1200=2506mm
λ2=l02/i=2505.888/16=156.618,查表得,φ2=0.287
f=N/(φA)+Mw/W=16018.037/(0.287×398)+0.053×106/4250=152.702N/mm2≤[f]=205N/mm2
H/B=5.85/8.4=0.696≤3
满足要求,不需要进行抗倾覆验算 !
十、立杆支承面承载力验算
F1=N=16.018kN
DL/T 776-2019 火力发电厂绝热材料.pdf 1、受冲切承载力计算
um =2[(a+h0)+(b+h0)]=1520mm
F=(0.7βhft+0.25σpc,m)ηumh0=(0.7×1×1.115+0.25×0)×1×1520×280/1000=332.181kN≥F1=16.018kN
2、局部受压承载力计算
可得:fc=11.154N/mm22020G520-1_2(2020年合订本):钢吊车梁(6m_9m)(2020年合订本)-带书签,βc=1,
βl=(Ab/Al)1/2=[(a+2b)×(b+2b)/(ab)]1/2=[(300)×(300)/(100×100)]1/2=3,Aln=ab=10000mm2
F=1.35βcβlfcAln=1.35×1×3×11.154×10000/1000=451.737kN≥F1=16.018kN