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雨篷板计算书
项目名称_____________ 日 期_____________
设 计 者_____________ 校 对 者_____________
一、基本参数
根部板厚 h1 = 150 mm 端部板厚 h2 = 150 mm
翻 边 宽 b = 200 mm 翻 边 高 h3 = 700 mm
挑出长度 L = 1700 mm
板面粉刷荷载标准值 qq1 = 4.00 kN/m
活荷载、积水荷载、雪荷载标准值大值 qq2 = 0.50 kN/m
检修集中荷载标准值 F = 0.00 kN/m
砼等级:C30 钢筋等级:HRB400
保护层厚 c = 15 mm
二、材性参数
钢筋强度设计值 fy = 360.0 MPa
钢筋弹性模量 Es = 200000.0 MPa
砼轴心抗压强度设计值 fc = 14.3 MPa
砼轴心抗拉强度设计值 ft = 1.4 MPa
砼轴心抗拉强度标准值 ftk= 2.0 MPa
砼弹性模量 Ec = 30000.0 MPa
系数 α1 = 1.00
三、弯矩计算
根部板重 q1 = 25 x h1 / 1000 = 3.75 kN/m
端部板重 q2 = 25 x h2 / 1000 = 3.75 kN/m
翻边重 Q3 = 25 x b x h3 / 1e6 = 3.50 kN/m
恒载下弯矩标准值 Mk1 = 0.5 x q2 x L x L+1/6. x (q1-q2) x L x L
+ 0.5 x qq1 x L x L + Q3 x L + 0.5 x Q3 x L x L
= 22.21 kN.m/m
活载下弯矩标准值 Mkt1 = 0.5 x qq2 x L x L = 0.72 kN.m/m
检修荷载下弯矩标准值 Mkt2 = F x L = 0.00 kN.m/m
取活载弯矩标准值 Mk2 = Max ( Mkt1 , Mkt2 ) = 0.72 kN.m/m
弯矩组合标准值 Mk = Mk1 + Mk2 = 22.93 kN.m/m
弯矩组合设计值 M = Max ( 1.2 x Mk1 + 1.4 x Mk2 ,
1.35 x Mk1 + 0.7 x 1.4 x Mk2 )
= 30.69 kN.m/m
有效厚度 h0 = h1 - c - 5 = 130
四、配筋计算
β1 = 0.80
ξb = β1 / (1 + fy / 0.0033 / Es) = 0.518
ρmin = Max( 0.2 , 45 x ft / fy) = 0.200 %
ρmax = ξb x α1 x fc / fy = 2.056 %
αs = M /α1/fc/b/h0/h0 = 0.127
γs = ( 1 + sqrt( 1 - 2αs ) ) / 2 = 0.932
配筋面积 As = Max(ρmin x h1 x 1000, M / γs / fy / h0) = 703.6 mm
实配 HRB400 10 @ 100 面积 785.4 mm 满足!
配 筋 率 ρ = As / h0 / 1000 x 100 = 0.604 % ≤ ρmax 满足!
五、裂缝计算
As = 785.4 mm
Ate = 75000.0 mm
ρte = As/Ate = 0.010
v = 1.00
deq = d/v = 10.00 mm
ho = 130 mm
σsk = Mk/(0.87ho x As) = 258.12 MPa
ftk = 2.01 MPa
ψ = 1.1-0.65ftk/ρte/σsk = 0.617
c = 15 mm < 20 mm 取 c = 20 mm
αcr = 1.9
ωmax = αcr x ψ x σsk x (1.9c + 0.08deq/ρte)/Es = 0.173 mm
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