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储罐抗震计算

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Selected 储罐, 抗震.
  • 储罐
  • 抗震
  • 储罐
  • 抗震
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注:
本计算书是参照GB50341-2003附录D编制的。                                            1.黄色的背景是需要输入的项,蓝色字体为结果。如果出现红色文字,则说明计算不通过。
This calculation sheet is prepared referring to GB50341-2003 appendix D. 2. 参考标准GB50314-2003附录D和和其条文说明。
3.有效厚度应除去腐蚀余量和gangban负偏差
输入数据 Input Data 4.17列的储罐质量为“罐壁及其支撑的固定罐顶重量,包含保温,梯子和管口附件等,不含罐底板和储液”
储罐内径 Inside diameter of Tank D= 42 m 5.建议校核完后检查晃动波高加液位高度小于储罐高度
储罐壁高度 Height of Tank H= 17.5 m Hw+hv= 16.1204  ≤ 17.5
储罐液位高度 Maximum design height of fluid Hw= 15.75 m 6.GB50341地震力计算一般比同工况下的API650计算得到的值要低
储罐液体密度 Density of fluid ρ= 792 kg/m3 7.GB50341地震计算不分锚固与不锚固,API650分锚固和非锚固,一般锚固时可以增
设计温度下罐壁底部钢材弹性模量                                                     Modulus of Elasticity of bottom shell at design temperature E= 203000 Mpa   大地震降低系数, 可以减薄筒体厚度。计算所需要的螺栓个数建议采用API650的算法。
底层罐壁的有效厚度                                                                    Equivalent uniform thickness of  bottom shell  t= 0.0175 m 8.如果静压设计的壁厚在抗震计算不能通过,那么对最底层罐壁进行多大的增加,其余层罐壁也应在静压计算的基础上以同样比例增加,否则应进行逐层罐壁的抗震校核。(hold待讨论)
罐壁距离底板1/3处的有效厚度                                                        Equivalent uniform thickness of 1/3 H shell δ3= 0.0125 m
储罐质量(除罐底) Weight of tank (except bottom plate) mo= 233300 kg
设计地震分组 Design group of seismic 第三组
场地类别 Site ground category Ⅰ
设防烈度 Seismic intensity 7,0.15g
设计计算 Checking strength
储罐半径 Ridius of tank R=D/2 21 m
直径液高比 Diamter-Height ratio D/Hw 2.6667 
耦连振动周期系数 Coupling vibration of periodic coefficients Kc 0.00047279 
储罐与储液耦连振动基本周期 Tank and fluid coupling vibration natural period 1 0.3052  s
晃动周期基本系数 Sloshing period coefficient Ks 1.1160 
储液晃动基本周期 Natural period of sloshing of fluid Tw=Ks√D 7.2327  s
水平地震影响系数最大值
Max coefficient of lateral acceleration 
αmax 0.345 m/s2
反应谱特征周期 
Response spectrum feature period
Tg 0.35 s
地震影响系数(耦连)
Seismic coefficient(Coupling)
αc 0.3450 
地震影响系数(晃动) 
Seismic coefficient(Sloshing)
αw 0.0118 
综合影响系数 
Comprehensive effect coefficient
Cz 0.4
罐体影响系数 Tank effect coefficient Y1 1.1
重力加速度 Acceleration of gravity g 9.81 m/s2
储罐内储液总质量 Weight of fluid m1=0.25πD2Hwρ 17282008.0  kg
动液系数  impulsive coefficient Fr 0.4246 
产生地震作用的储液的等效质量 
The effective impulsive weight
m=m1Fr 7337326.61 kg
罐底部水平地震剪力 
Seismic  shear at the base of tank
Q0=10-6CzαcY1mg 10.93  MN
罐壁底部的地震弯矩 
Seismic moment at the base of tank
M1=0.45Q0Hw 77.44  MN
水平地震作用下,罐内液面晃动波高 The height of sloshing fluid  hv=1.5αwR 0.3704  m
竖直地震影响系数
Vertical Seismic effect coefficient
Cv 1
罐壁底部垂直载荷 
Vertical load at the base of tank
N1=10-6mog 2.2887  MN
罐壁底层横截面积 
Area of bottom of shell
A1=πDt 2.3091  m2
底圈罐壁的断面系数 Cross section coefficient of bottom shell Z1=0.785D2t 24.2330  m3
翘离影响系数 Uplift effect coefficient CL 1.4
罐壁许用临界压力 
Allowance stress of bottom shell
[σcr]=0.15Et/D 12.69  Mpa
罐壁底部最大轴向压应力 
Max axial stress of bottom shell
1 5.47  Mpa
σ ≤ [σcr] 轴向力校核合格 It is safe
导向管与导向管套管上的钢盖板之间的允许最小间隙 
Allowance distance of guide pipe to guide pipe cover plate
0.0065  m
抗震计算
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