南北6米,东西7米2的客厅不要梁的钢筋怎么配筋?南边有1米宽7米2长阳台,谢谢

2025-03-11 01:38:24
推荐回答(3个)
回答1:

很简单,用12螺纹钢上下两层即可,间距10x10或者12X12都行,混厚度10公分或12公分,商品混凝土C35,这样的话就可以不用梁。

回答2:

LB-1矩形板计算
项目名称_____________日 期_____________
设 计 者_____________校对者_____________
一、构件编号: LB-1
二、示意图

三、依据规范
《建筑结构荷载规范》 GB50009-2012
《混凝土结构设计规范》 GB50010-2010
四、计算信息
1.几何参数
计算跨度: Lx = 6000 mm; Ly = 7200 mm
板厚: h = 130 mm
2.材料信息
混凝土等级: C20 fc=9.6N/mm2 ft=1.10N/mm2 ftk=1.54N/mm2 Ec=2.55×104N/mm2
钢筋种类: HRB335 fy = 300 N/mm2 Es = 2.0×105 N/mm2
最小配筋率: ρ= 0.200%
纵向受拉钢筋合力点至近边距离: as = 20mm
保护层厚度: c = 15mm
3.荷载信息(均布荷载)
永久荷载分项系数: γG = 1.300
可变荷载分项系数: γQ = 1.400
准永久值系数: ψq = 1.000
永久荷载标准值: qgk = 0.500kN/m2
可变荷载标准值: qqk = 2.000kN/m2
4.计算方法:弹性板
5.边界条件(上端/下端/左端/右端):简支/简支/简支/简支
6.设计参数
结构重要性系数: γo = 1.00
泊松比:μ = 0.200
五、计算参数:
1.计算板的跨度: Lo = 6000 mm
2.计算板的有效高度: ho = h-as=130-20=110 mm
六、配筋计算(lx/ly=6000/7200=0.833<2.000 所以按双向板计算):
1.X向底板钢筋
1) 确定X向板底弯矩
Mx = 表中系数(γG*qgk+γQ*qqk)*Lo2
= (0.0524+0.0343*0.200)*(1.300*0.500+1.400*2.000)*62
= 7.365 kN*m
2) 确定计算系数
αs = γo*Mx/(α1*fc*b*ho*ho)
= 1.00*7.365×106/(1.00*9.6*1000*110*110)
= 0.063
3) 计算相对受压区高度
ξ = 1-sqrt(1-2*αs) = 1-sqrt(1-2*0.063) = 0.066
4) 计算受拉钢筋面积
As = α1*fc*b*ho*ξ/fy = 1.000*9.6*1000*110*0.066/300
= 231mm2
5) 验算最小配筋率
ρ = As/(b*h) = 231/(1000*130) = 0.177%
ρ<ρmin = 0.200% 不满足最小配筋要求
所以取面积为As = ρmin*b*h = 0.200%*1000*130 = 260 mm2
采取方案8@180, 实配面积279 mm2
2.Y向底板钢筋
1) 确定Y向板底弯矩
My = 表中系数(γG*qgk+γQ*qqk)*Lo2
= (0.0343+0.0524*0.200)*(1.300*0.500+1.400*2.000)*62
= 5.567 kN*m
2) 确定计算系数
αs = γo*My/(α1*fc*b*ho*ho)
= 1.00*5.567×106/(1.00*9.6*1000*110*110)
= 0.048
3) 计算相对受压区高度
ξ = 1-sqrt(1-2*αs) = 1-sqrt(1-2*0.048) = 0.049
4) 计算受拉钢筋面积
As = α1*fc*b*ho*ξ/fy = 1.000*9.6*1000*110*0.049/300
= 173mm2
5) 验算最小配筋率
ρ = As/(b*h) = 173/(1000*130) = 0.133%
ρ<ρmin = 0.200% 不满足最小配筋要求
所以取面积为As = ρmin*b*h = 0.200%*1000*130 = 260 mm2
采取方案8@180, 实配面积279 mm2
七、跨中挠度计算:
Mq -------- 按荷载效应的准永久组合计算的弯矩值
1.计算荷载效应
Mq = Mgk+ψq*Mqk
= (0.0524+0.0343*0.200)*(0.500+1.0*2.000)*62 = 5.337 kN*m
2.计算受弯构件的短期刚度 Bs
1) 计算按荷载荷载效应的两种组合作用下,构件纵向受拉钢筋应力
σsq = Mq/(0.87*ho*As) 混规(7.1.4-3)
= 5.337×106/(0.87*110*279) = 199.885 N/mm
2) 计算按有效受拉混凝土截面面积计算的纵向受拉钢筋配筋率
矩形截面积: Ate = 0.5*b*h = 0.5*1000*130= 65000mm2
ρte = As/Ate 混规(7.1.2-4)
= 279/65000 = 0.429%
3) 计算裂缝间纵向受拉钢筋应变不均匀系数ψ
ψq = 1.1-0.65*ftk/(ρte*σsq) 混规(7.1.2-2)
= 1.1-0.65*1.54/(0.429%*199.885) = -0.067
因为ψ不能小于最小值0.2,所以取ψq = 0.2
4) 计算钢筋弹性模量与混凝土模量的比值 αE
αE = Es/Ec = 2.0×105/2.55×104 = 7.843
5) 计算受压翼缘面积与腹板有效面积的比值 γf
矩形截面,γf=0
6) 计算纵向受拉钢筋配筋率ρ
ρ = As/(b*ho)= 279/(1000*110) = 0.254%
7) 计算受弯构件的短期刚度 Bs
Bsq = Es*As*ho2/[1.15ψq+0.2+6*αE*ρ/(1+ 3.5γf')](混规(7.2.3-1))
= 2.0×105*279*1102/[1.15*0.200+0.2+6*7.843*0.254%/(1+3.5*0.0)]
= 1.229×103 kN*m2
3.计算受弯构件的长期刚度B
1) 确定考虑荷载长期效应组合对挠度影响增大影响系数θ
当ρ'=0时,θ=2.0 混规(7.2.5)
2) 计算受弯构件的长期刚度 B
Bq = Bsq/θ (混规(7.2.2-2))
= 1.229×103/2.0
= 6.145×102 kN*m2
4.计算受弯构件挠度
fmax = f*(qgk+Ψq*qqk)*Lo4/B
= 29.824mm
5.验算挠度
挠度限值fo=Lo/200=6000/200=30.000mm
fmax=29.824mm≤fo=30.000mm,满足规范要求!
八、裂缝宽度验算:
1.跨中X方向裂缝
1) 计算荷载效应
Mx = 表中系数(qgk+ψq*qqk)*Lo2
= (0.0524+0.0343*0.200)*(0.500+1.00*2.000)*62
= 5.337 kN*m
2) 光面钢筋,所以取值vi=0.7
3) 因为C < 20,所以取C = 20
4) 计算按荷载效应的准永久组合作用下,构件纵向受拉钢筋应力
σsq=Mq/(0.87*ho*As) 混规(7.1.4-3)
=5.337×106/(0.87*110*279)
=199.885N/mm
5) 计算按有效受拉混凝土截面面积计算的纵向受拉钢筋配筋率
矩形截面积,Ate=0.5*b*h=0.5*1000*130=65000 mm2
ρte=As/Ate 混规(7.1.2-4)
=279/65000 = 0.0043
因为ρte=0.0043 < 0.01,所以让ρte=0.01
6) 计算裂缝间纵向受拉钢筋应变不均匀系数ψ
ψ=1.1-0.65*ftk/(ρte*σsq) 混规(7.1.2-2)
=1.1-0.65*1.540/(0.0100*199.885)
=0.599
7) 计算单位面积钢筋根数n
n=1000/dist = 1000/180
=5
8) 计算受拉区纵向钢筋的等效直径deq
deq= (∑ni*di2)/(∑ni*vi*di)
=5*8*8/(5*0.7*8)=11
9) 计算最大裂缝宽度
ωmax=αcr*ψ*σsq/Es*(1.9*C+0.08*Deq/ρte) (混规(7.1.2-1)
=1.9*0.599*199.885/2.0×105*(1.9*20+0.08*11/0.0100)
=0.1473mm ≤ 0.30, 满足规范要求
2.跨中Y方向裂缝
1) 计算荷载效应
My = 表中系数(qgk+ψq*qqk)*Lo2
= (0.0343+0.0524*0.200)*(0.500+1.00*2.000)*62
= 4.034 kN*m
2) 光面钢筋,所以取值vi=0.7
3) 因为C < 20,所以取C = 20
4) 计算按荷载效应的准永久组合作用下,构件纵向受拉钢筋应力
σsq=Mq/(0.87*ho*As) 混规(7.1.4-3)
=4.034×106/(0.87*110*279)
=151.077N/mm
5) 计算按有效受拉混凝土截面面积计算的纵向受拉钢筋配筋率
矩形截面积,Ate=0.5*b*h=0.5*1000*130=65000 mm2
ρte=As/Ate 混规(7.1.2-4)
=279/65000 = 0.0043
因为ρte=0.0043 < 0.01,所以让ρte=0.01
6) 计算裂缝间纵向受拉钢筋应变不均匀系数ψ
ψ=1.1-0.65*ftk/(ρte*σsq) 混规(7.1.2-2)
=1.1-0.65*1.540/(0.0100*151.077)
=0.437
7) 计算单位面积钢筋根数n
n=1000/dist = 1000/180
=5
8) 计算受拉区纵向钢筋的等效直径deq
deq= (∑ni*di2)/(∑ni*vi*di)
=5*8*8/(5*0.7*8)=11
9) 计算最大裂缝宽度
ωmax=αcr*ψ*σsq/Es*(1.9*C+0.08*Deq/ρte) (混规(7.1.2-1)
=1.9*0.437*151.077/2.0×105*(1.9*20+0.08*11/0.0100)
=0.0813mm ≤ 0.30, 满足规范要求

回答3:

简单。但是这个需要花点时间去做。如需要可以帮助你计算,私信我。

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