多国风荷载规范

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z 10
V
湍流强度
Iz
I0
10 z
V ——10m 高度处的参考风速,为 10min 统计平均风速。
2.3 风特性剖面
30
(2-1) (2-2)
1. 平均风速
2. 湍流强度
3. 湍动能
3 日本建筑规范(AIJ-04)
3.1 地貌分类
Exposure α

0.10
Ⅱ(standard) 0.15

0.20
City, tall buildings (4 to 9-story) City, heavy concentration of tall buildings (higher than 10-story)
3.2 风特性公式
平地平均风速 平地湍流强度 积分长度尺度
Uz
U0
Er
U
0
U 0
1.7 z zG , zb z 1.7 zb zG , z zb
多国风荷载规范风特性整理
1 美国规范(ASCE7-10: Minimum Design Loads for Buildings and Other Structures)
1.1 地貌分类(Exposure Categories)
Exposure
B C(standard)
D
zg (m)
b
c
l (m)
7.0 365.76 1 4.0 0.45 0.30 97.54 1 3.0

0.27

0.35
zg (m)
250 350 450 550 650
zmin (m)
5 5 10 20 30
Condition at construction site and upwind region Open, no significant obstruction, sea, lake
Open, few obstructions, grassland, agricultural field Suburban, wooded terrain, few tall buildings (4-9 story)
Ce z 100.28 , z 10 Ce 0.5 z 12.70.50 , z 12.7
Ce 0.4 z 300.72 , z 30
平地平均风速
Vz V Cez
平地湍流强度
Iz
c
z 10
V ——10m 高度处的参考风速,为 1h 的统计平均风速
4.3 风特性剖面
c
0.14
0.2
0.25 0.34
z0 (m) zmin (m)
0.002
3
0.02
5
0.2
10
2.0
20
5
forest)
Area in which at least 15% of the surface is covered with buildings and their Ⅳ
average height exceeds 15m
z0 (m)
0.003 0.01 0.05
0.3
1.0
zmin (m)
1 1 2
having heights generally from 1.5m to 10m Terrain with numerous closely spaced obstructions 3m to 5m high, such as areas 3
of suburban housing Terrain with numerous large, high (10m to 30m high) and closely spaced 4 obstructions, such as large city centers and well-developed industrial complexes
5
10
4
5.2 风特性剖面
平地平均风速
vm
vb
0.19
z0 z0,II
0.07
0.07
ln
z z0
, zmin
z
Baidu Nhomakorabea200
vb
0.19
z0 z0,II
ln
zmin z0
,
z
zmin
(5-1)
平地湍流强度
Iv
1
ln z z0
1
ln zmin
, zmin
,z
z0
zG
I rz
0.1 z
0.1 zb
zG 0.05 , zb zG 0.05 , z
z zb
zG
Lz
100 z 300.5 ,30m
100, z 30m
z
zG
(3-1) (3-2) (3-3)
U0 ——10m 高度处的基本风速,为 100 年重现期的 10min 统计平均风速。
积分尺度与地形、地貌无关(Turbulence scale is defined independently of the terrain categories of the construction site)
6.1 地貌分类
Terrain category Exposed open terrain with few or no obstructions and water surfaces at 1
serviceability wind speeds Water surfaces, open terrain, grassland with few, well-scattered obstructions 2
z 200 zmin
(5-2)
vb ——基本风速,年超越概率 0.02、10min 风速时距、10m 高度处的统计平均风速。
5.3 风特性剖面
1. 平均风速
2. 湍流强度
3. 湍动能
6 澳 洲 规 范 ( AS-NZS.1170.2.2011-Structural Design Actions-Part2 Wind Action)
with separations of at least 20 obstacle heights
Area with regular cover of vegetation or buildings or with isolated obstacles with
Ⅲ separations of maximum 20 obstacles heights (villages, suburban, permanent
Lz
l
z 10
(1-3)
V ——10m 高度处的参考风速(mi/h),为 3s 阵风风速;在上式中,对高度为 h 的建筑
物而言: z z (0.6h) ,且当建筑物高度 h zmin 时,取 z zmin 。
要注意单位与平均时距(3s 换算是 10min 的系数为 1.5)的换算。
1.3 风特性剖面
0.36 0.62
zg (m)
263.76 317.5 382.39
(4-1) (4-2)
1. 平均风速
2. 湍流强度
3. 湍动能
5 欧洲规范(Eurocode 1: Actions on structures-Part 1-4: General actionsWind actions)
5.1 地貌分类
Terrain category
0
Sea or coastal area exposed to the open sea
Ⅰ Lakes or flat and horizontal area with negligible vegetation and without obstacles
Area with low vegetation such as grass and isolated obstacles (trees, buildings) Ⅱ
2
3.3 风特性剖面
1. 平均风速
2. 湍流强度
3. 湍动能 3.4 GB 与 AIJ 剖面对比
4. 湍动能(近地面)
1. 平均风速
2. 湍流强度
3. 湍动能
3
4 加拿大国家建筑规范(NBC 2005)
4.1 地貌分类
Exposure A(标准地貌)
B C
4.2 风特性公式
Exposure factor
9.5 274.32 1 6.5 0.65 0.20 152.40 1 5.0
11.5 213.36 1 9.0 0.80 0.15 198.12 1 8.0
zmin (m) 9.14 4.57 2.13
1.2 风特性公式
平均速度
Vz
b
z 10
V
(1-1)
湍流强度
Iz
c
10 z
1
6
(1-2)
积分长度尺度
1. 平均风速
2. 湍流强度
2 中国建筑结构荷载规范(GB50009-2012)
2.1 地貌分类
Exposure A B C
zg (m)
0.12
300
0.15
350
0.22
450
1
3. 湍动能
I0
zmin (m)
0.12
5
0.14
10
0.23
15
D
0.30
550
0.39
2.2 风特性公式
平均速度
Vz
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